Recommended Suspension Bushings for MN12's and FN10's - TCCoA Forums

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post #1 of 65 (permalink) Old 02-09-2014, 12:38 PM Thread Starter
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Recommended Suspension Bushings for MN12's and FN10's

Recommended suspension bushings for MN12’s and FN10’s
Written by: Rod Maksimovich (Racecougar)




Whether you prefer a smooth, stock ride, or something a bit firmer and performance oriented, after twenty-plus years of service, all of these cars deserve a thorough inspection and possibly replacement of the various bushings throughout the front and rear suspension systems. Let’s dive right in and see what we’re dealing with, and what our replacement options are.

Front anti-sway bar mount bushings:
Whether we’re dealing with a stock anti-sway bar or one of the offerings from ADDCO, Energy Suspension has you covered here. They offer a channeled, greaseable, polyurethane bushing, along with mount saddles and grease zerks that is leaps and bounds superior to both the stock rubber bushings and the “hogged out” poly bushings supplied with the ADDCO bars.

In the photo below, a 1-1/4” Energy Suspension bushing/mount is on the left. On the right is what you would receive with a 1-1/4” ADDCO anti-sway bar. If you look closely, you’ll notice that it is a 1-1/16” bushing that has been bored out to fit the 1-1/4” bar, leaving behind a rough, grippy surface without any channels for grease retention. These bushings, as well as the factory original rubber bushings, tend to squeak and resist movement. Gratuitous use of grease during assembly only delays the onset of this annoyance.



Notice the chart below, found at the following link: http://www.energysuspensionparts.com...r-Bushings.asp

For the front anti-sway bar, you want to stick to the bushings in the right column of the chart. For example, with a 1-1/4” ADDCO bar, you would order part number 9.5172. If you are using a stock bar, measure the diameter of the bar with a set of calipers at the bushing location and check the chart to see if a bushing is available in the appropriate size.







Front strut rod bushings:
This is one area where a higher durometer bushing material isn’t only undesirable, it can become downright dangerous. The thermoplastic strut rod to K-member bushings are known to fail without warning, which can have serious consequences.

Just one of many reported cases of this issue: Moog PI strut rod bushing failures



I highly recommend sticking to the Motorcraft rubber bushings in this instance. You’ll need two of each of the following:

Strut rod to K Member bushings: E9SZ-3B271-A and F7SZ-3A225-AA
Strut Rod to Lower Control Arm Bushings: E9SZ3A140A and E9SZ3A140B

This wonderful set of photos with part numbers was posted by Marcus at Lincolnvscadillac.com:
http://www.lincolnvscadillac.com/for...post2037284674








Front upper control arm to shock tower bushings:
While there are polyurethane replacements available, this is an area of diminishing return. Provided that they are in satisfactory condition, the typical rubber bushings as provided in any replacement upper control arm assembly will perform sufficiently. If this is an all-out autocross or open track effort, I could understand switching over to poly.



Front lower control arm to K-member bushings:
Same as above.



Rear anti-sway bar mount bushings:
Just as the front anti-sway bar mount bushings, there is significant room for improvement here. These bushings host all the same issues, along with an additional recurring problem when a larger rear anti-sway bar is added to the mix.



When running a larger ADDCO rear anti-sway bar, broken mounts become a common problem. One solution that has worked for me in the past was to increase the thickness of the mount saddle near the bolt hole. Note the additional thickness of the mount saddle on the right side of the photo below.




An improved solution is accomplished through the use of one of Energy Suspension polyurethane bushing sets along with an easily fabricated mount plate arrangement. For the rear anti-sway bar bushings, you will want to order from the left column in the chart I posted earlier. For example, with a 1-1/4” ADDCO bar, you would order part number 9.5165. Just as before, if you are using a stock bar, measure the diameter of the bar with a set of calipers at the bushing location and check the chart to see if a bushing is available in the appropriate size.

To use the Energy Suspension bushings, you will need to create both a backing plate and a threaded plate (a nut tacked to flat stock will suffice) for each side. The backing plate will sandwich between the bushing and the IRS cradle, while the threaded plate will provide a location for the rear mounting bolt to attach to.





Rear upper control arm to IRS cradle bushings:
This bushing has a keyed, eccentric core. Rotating the core by turning the bolt securing it to the IRS cradle provides rear camber adjustment. However, this bushing is very commonly skipped over by the unknowledgeable alignment tech at the typical tire chain store. This bushing is notorious in a few other ways as well. As it wears, it allows the top of the rear tire to move inward/outward, affecting the rear camber. It often results in a “loose” feeling similar to a failing rear wheel bearing. It has also has caused some trouble due to a well-circulated replacement bushing of a flawed design. Both the correct, original design and the flawed replacement have shown up in the same packaging, under the same part numbers, through multiple brands. The only way to be certain you're receiving the correct part is to open the box(es) prior to payment and verifying visually.

This is the bushing you DON'T want to install:


Those consist of a metal core with a off-center, elliptical, hole inside a metal sleeve which is rubber bonded to an outer shell. Turning the inner core via the bolt allows for camber adjustment, however with the sleeve bonded to the outer shell, the control arm can't move without winding up the bushing. Whoever designed/manufactured the bushing either didn't grasp or simply disregarded the original, correct design; something that seems to happen all too often when it comes to aftermarket parts. Installing these bushings results in a relatively harsh ride and very limited rear suspension travel.


This is the bushing you DO want to install (original design):


Those allow camber adjustment and full range of motion without windup, just as they should.


Rear lower control arm to IRS cradle bushings:
This is one area where we can significantly reduce the vehicle’s tendency to wheelhop by changing the bushing material. Under heavy acceleration, the stock rubber bushings, along with toe link compensators that are typically past their prime, allow the control arm to deflect forward, at which point the tire breaks traction, the bushings rebound, and the cycle repeats rapidly. Removing this “give” will prevent this movement, which is a step in the right direction when it comes to reducing wheelhop and undesired rear toe changes.

I recommend replacing these bushings with a harder material, such as the greaseable, Delrin bushings with hard anodized aluminum sleeves offered through a few individuals. Polyurethane will offer an improvement over the stock rubber bushings, however the harder Delrin material is better suited for this location.

This is the lower control arm bushing kit that Doug (RIP) offered:



Photos borrowed from his website: http://home.comcast.net/~dlfraleigh/...BushingKit.pdf

Rear knuckle to upper and lower control arm bushings:
Just as the lower control arm to IRS cradle bushings, replacing the stock rubber knuckle bushings with a harder material can be advantageous. Once again, Delrin is better suited to the task than polyurethane, and a few individuals also produce a nice greaseable set with hard anodized aluminum sleeves.

This is the knuckle bushing kit Doug (RIP) offered:



Photos borrowed from his website:
http://home.comcast.net/~dlfraleigh/...BushingKit.pdf


Differential mounting:
This is yet another area that deserves some attention in regards to reducing undesired movement. The stock rubber mounts allow the differential case to move significantly under heavy acceleration, especially as they age/fail. Replacing these components with a quality polyurethane will make a notable reduction in differential case movement, which is a step in the right direction. There are a number of suppliers of both polyurethane and aluminum differential case to IRS mounts. The aluminum mounts will prevent any movement of the case, however they may result in a noticeable increase in NVH.

When it comes to the rear mount, which attaches to both the IRS cradle and the differential cover, there are a few different paths. One common, and cost-effective, method is to simply place a bolt through the rear mount, preventing the inner and outer halves from moving in relation to one another.


Another relatively new option is to run a polyurethane bushing in a alternative mount design, such as the one offered by Performance Art Works. If you’re handy with a welder, you can make your own at home without much difficulty using a polyurethane 4-link end and some flat stock.



Pictures from SCP: https://supercoupeperformance.com/pa...spx?partId=833


Regardless of what method you choose to employ, I highly recommend either reinforcing the differential cover with a diff cover brace or replacing the cover with a sturdier version. LPW, FRPP, Fore Innovations, and Control Freak all offer heavy duty differential covers, and far, far more suppliers of differential cover braces exist.

The LPW cover:


Without bracing or replacing the stock differential cover, you run the risk of snapping the mount right off.



I hope that this short intro to MN12/FN10 suspension bushings proves helpful to you when choosing the proper replacement parts for your vehicle.

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post #2 of 65 (permalink) Old 02-10-2014, 08:34 PM
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Couldn't have been timed better with your posting of this Rod. My next "big" project for the bird is a rebuild of the IRS subframe and I've been wondering what bushings I need to buy...

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post #3 of 65 (permalink) Old 02-10-2014, 08:46 PM
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Exactly B , At some point this year I am going to be putting on Mark lower arms and these bushings sound like a plan. As well as the IRS cradle MOD . Thank you on here as well Rod.
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post #4 of 65 (permalink) Old 02-10-2014, 09:31 PM
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You need the DLF bushings, and the energy suspension stuff for everything else.

I have one going together; it will be solid as Rod's subframe connectors.
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post #5 of 65 (permalink) Old 02-11-2014, 06:10 AM
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Hell of a post man!
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post #6 of 65 (permalink) Old 02-11-2014, 09:22 AM
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Great info Rod you da man!
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post #7 of 65 (permalink) Old 02-11-2014, 12:49 PM
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Nice job Rod! 5-Star thread!
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Stuff like this is why we love TCCoA. Great post!
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post #9 of 65 (permalink) Old 02-11-2014, 03:34 PM
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does performance art works still sell that rear diff mount? I checked their site and didn't see it on there.

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post #10 of 65 (permalink) Old 02-11-2014, 08:11 PM Thread Starter
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Thanks guys!

Quote:
Originally Posted by ricklovin93 View Post
does performance art works still sell that rear diff mount? I checked their site and didn't see it on there.
You'd have to contact them. Bill Evanoff was/is selling it as well at SCP.
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i definitely felt a major difference in the rear end when i swapped everything over to energy suspension polys. wish i could have afforded the delrin from DLF, especially since hes no longer around but I'm happy with what i have i suppose.

still need to get to the rear diff mount upgraded, but i did upgrade the forward diff bushings with energy suspension as well since they were completely shot. then i reused two of the halves to bolt my 'backwoods' spring perches in place

in the end once i finished my rebuild i discovered my toe compensators were toast... warm buttery toast... they were allowing the rear end the steer the car around in ruts and stuff... it could get a bit terrifying actually.... even wind blowing across the car would cause me to have to correct constantly...

felt so much like bad steering components. but don't be fooled.... i rebuilt the front end trying to remedy this problem till i had to look at the back since everything up front was new >.>

and definitely get yourself ford OE strutarm bushings! those plastic ones as you can see from those pics are terrible. all the breaking force on the front end of the car is applied to those things, they have to be rubber and flex a lot, or they will squish and tear instead

just beware of the forward bushing sleeves... they are almost always rust welded together. plus they are deformed from their first install and you will destroy them during the removal process. DLF used to make new ones, and their is a guy that purchased all of his machine hardware and blueprints, so you should still be able to get them.

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post #12 of 65 (permalink) Old 02-12-2014, 07:54 AM
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Energy Suspension part #

http://www.energysuspensionparts.com...sp?prod=4.3163 so this is the correct part for the rear spindle bushings??
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post #13 of 65 (permalink) Old 02-12-2014, 10:05 AM Thread Starter
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Quote:
Originally Posted by '93MN12 View Post
http://www.energysuspensionparts.com...sp?prod=4.3163 so this is the correct part for the rear spindle bushings??
Yes, that is the correct part number for polyurethane rear knuckle bushings.

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post #14 of 65 (permalink) Old 02-12-2014, 10:52 AM
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Thanks Rod. As for the Upper control arm to frame bushing, do we have a recommended vendor that I can order from that will definitely send the correct part? I've noticed several companies and even on Super Coupe Peformance's website, that the picture shows the wrong style, the one that causes bushing windup.

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post #15 of 65 (permalink) Old 02-12-2014, 11:46 AM
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Yup Rod you tha man, this is why we need to make sure TCCOA stays around. Thanks again!!!
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post #16 of 65 (permalink) Old 02-12-2014, 12:51 PM
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Quote:
Originally Posted by '93MN12 View Post
Thanks Rod. As for the Upper control arm to frame bushing, do we have a recommended vendor that I can order from that will definitely send the correct part? I've noticed several companies and even on Super Coupe Peformance's website, that the picture shows the wrong style, the one that causes bushing windup.
Print out the pictures, and buy from a local shop AFTER opening the boxes to verify they're the good parts.

The crap ones are also coming in Moog boxes ...

(I've got ACDelco on Ruby, but they're about 5 years old now.)

RwP
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post #17 of 65 (permalink) Old 02-12-2014, 04:33 PM
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Question

Sounds like a plan. When it comes to pressing out the old bushings, would a tool such as this be effective? http://m.harborfreight.com/automotiv...set-68971.html

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post #18 of 65 (permalink) Old 02-12-2014, 05:13 PM Thread Starter
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Quote:
Originally Posted by '93MN12 View Post
Thanks Rod. As for the Upper control arm to frame bushing, do we have a recommended vendor that I can order from that will definitely send the correct part? I've noticed several companies and even on Super Coupe Peformance's website, that the picture shows the wrong style, the one that causes bushing windup.
Bill Evanoff at SCP guarantees that he only stocks the correct bushing. Otherwise, stick to buying them locally after seeing them in person.


Quote:
Originally Posted by '93MN12 View Post
Sounds like a plan. When it comes to pressing out the old bushings, would a tool such as this be effective? http://m.harborfreight.com/automotiv...set-68971.html
That won't work well. I'd suggest using a shop press or a large bench vise.
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post #19 of 65 (permalink) Old 02-12-2014, 08:11 PM
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yeah, i used a press on mine, but you could just go the big socket, threaded rod, and some washersNnuts method like a lot of people do. that's how i pulled out the LCA bushings since the arms were pretty cumbersome to put on the press

just make sure you brace the open side of the control arm beforehand so it doesn't crush together. i just used a socket, cant remember what size. or just get some sheet metal and weld it in solid on the bottom for strength
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post #20 of 65 (permalink) Old 04-29-2014, 01:54 PM
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Excellent write up...
Does anyone know the size/thread pitch for the nuts on the strut rods.?
I'd like to replace them when the new bushings come in this weekend. I got the bushings from www.Fordpartsgiant.com but could not find nuts washers or sleeves. I looked on Ebay, searching by part numbers but came up empty handed.
I'm sure I can reuse my washers.
Don't know about the sleeves yet, they are still in the car. They are the originals I believe so maybe they can be reused.

Does any of the other Ford Bushing kits contain any of the same parts as what is needed for this bird? I'd hate to buy a whole kit for a sleeve but will if need be.

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post #21 of 65 (permalink) Old 07-17-2014, 07:26 PM
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Quote:
Originally Posted by racecougar View Post

For the front anti-sway bar, you want to stick to the bushings in the right column of the chart. For example, with a 1-1/4” ADDCO bar, you would order part number 9.5172.

For the rear anti-sway bar bushings, you will want to order from the left column in the chart I posted earlier. For example, with a 1-1/4” ADDCO bar, you would order part number 9.5165.
Just curious as to "why"? They seem slightly different in size, but why would the 9.5165 not work in the front (as an example)?
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post #22 of 65 (permalink) Old 07-17-2014, 10:45 PM
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If I remember correctly, the holes in the front are not quite 3" apart - or are, but then that would not give any room for the bolt to fit.

That's if I remember.

I'll try to remember to caliper the bolts and see how far apart they are.

RwP

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post #23 of 65 (permalink) Old 07-18-2014, 01:03 AM
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Quote:
Originally Posted by RalphP View Post
If I remember correctly, the holes in the front are not quite 3" apart - or are, but then that would not give any room for the bolt to fit.

That's if I remember.

I'll try to remember to caliper the bolts and see how far apart they are.

RwP
Unless I'm going blind I measured them to be about ~3.25" apart.
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post #24 of 65 (permalink) Old 07-18-2014, 06:18 AM Thread Starter
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Just curious as to "why"? They seem slightly different in size, but why would the 9.5165 not work in the front (as an example)?
Height. Notice the 3/4" vs 1-1/8" dimension. You may be able to make one from the right column fit on the rear, but you'll have more trouble than it's worth trying to get one from the left column fit the front. As it is, with the 1-1/4" ADDCO bar and 9.5172 bushing up front, you'll have to place the shaft collars correctly so that the bolt heads do not contact the K-member as the bar rotates with suspension travel.

Beyond that, the ones on the right are a good fit for the front. The ones on the left are a good fit for the rear. Why struggle to make one fit the other?

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post #25 of 65 (permalink) Old 07-18-2014, 12:08 PM
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Not struggling just mere curiosity. Will the rear also require shaft collars?
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post #26 of 65 (permalink) Old 07-18-2014, 04:16 PM Thread Starter
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Nope. By design, the rear anti-sway bar doesn't require the additional lateral locating that the front anti-sway bar does.
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post #27 of 65 (permalink) Old 07-18-2014, 09:53 PM
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Cool, thanks Rod. Have the appropriate bushings on the way. Just need to order the split collars.
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post #28 of 65 (permalink) Old 07-18-2014, 10:04 PM Thread Starter
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No problem. McMaster-Carr should have you covered on the split collars. Just watch your O.D.

Rod @ AzzKicker Cars
rodsv6cougar@cs.com
90 XR7-The Meth Addict-KB SC'd 5.0L DOHC Stroker
2004 Mustang GT-The Driver-Intake/Exhaust/3.73's
1995 F150 4x4-The Mud Toy-5.0L/4R70W/33's/Warn 8274 Winch
94 LX w/Splitport 3.8L from 2000 Mustang - SOLD
2 - 90 35th Anny Ed SC's
And a TON of parts cars!
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post #29 of 65 (permalink) Old 07-19-2014, 01:37 PM
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Quote:
Originally Posted by racecougar View Post
No problem. McMaster-Carr should have you covered on the split collars. Just watch your O.D.
Saw some on ebay, stainless steel 4 for $20 with a 2" OD. Cheaper than McMaster Carr. If I get any rubbing on the K, it's nothing these 7" air grinder's can't handle





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post #30 of 65 (permalink) Old 07-22-2014, 07:29 PM
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Race C'(racecougar)
do you have more info on the "LPW, FRPP, Fore Innovations, and Control Freak" diff covers. Do you know if those are all made to OEM (specs/sizing).?
Also, the "polyurethane bushing in an alternative mount design", do you know if those are followed OEM (specs/sizes).?
Sorry for all my questions Buddy, but i have some sort of poorly designed Diff brace (had to use washers to make this ghetto rig work) and would like to make sure that all this works together', e.g. Diff brace, new Diff cover and new alternative mount.
(overkill is better than Braking stuff)
ttyl
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