4.10 or 3.73 gear. - TCCoA Forums
 
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post #1 of 27 (permalink) Old 06-03-2004, 12:43 AM Thread Starter
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4.10 or 3.73 gear.

I'm looking for comparison. I'm not shure if i should upgrade to the 4.10 or not. Any advice would be much apreciated. Also, I have decient mechanical experience and am wondering how long i should expect to work on this.

Thanks,
Frank

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .
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post #2 of 27 (permalink) Old 06-03-2004, 12:59 PM
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How much highway driving do you do? What speed do you usually travel on the highway? how important is gas mileage to you?


You should drop the pumpkin, and take it to a professional. You must have the pinion angle, etc. to very exacting tolerances, and you need the right tools, ones the average DIY mechanic doesn't have.




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post #3 of 27 (permalink) Old 06-03-2004, 01:22 PM Thread Starter
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Well i do a lot of highway driving. 60mile round trip at least 5 times a week. I averege 75mph . I Know it would drop the gas mileage, however I was under the impression that it wasn't horrible.

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .
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post #4 of 27 (permalink) Old 06-03-2004, 02:44 PM
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At that kind of an average speed and frequency of trips, I think 3.73s would be a better choice. They're still a ton better than stock gears.

96 Mustang GT 5spd. w/ 248A Option (GTS). Stock for now until I get the Roush on.

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24k B&M Cooler, 1" lowered, Steeda UD Pulleys, Dynomax cat-back, J-mod, 3.73's, PI intake, PI cams, 03 GT MAF/Tube, SCT tuned - Gone but not forgotten.
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post #5 of 27 (permalink) Old 06-03-2004, 08:59 PM
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A lower gear ratio such as 3.73's will not necessarily lower your MPG. Mine stayed the same @ 26 MPG highway when I went from 3.27's to 3.73's.
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post #6 of 27 (permalink) Old 06-03-2004, 09:29 PM
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go for 410 or 430's. I run 373's with the blower and its still not enough gear. Hell my truck has 373's in it stock from the factory.
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post #7 of 27 (permalink) Old 06-03-2004, 09:40 PM
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I don't think my 4:10's affected my gas milage that much. Crappy before and crappy after them.

Here's what rpm my car is at certain speeds:

30mph - around 1700rpm (3rd)/2100 in (2nd gear)
40mph - 2000rpm (I didn't type what gear in the post, but I assume 3rd)
50mph - 2500rpm (same thing as 40mph)
60mph - 3100rpm in 3rd, 2200rpm in o/d
80mph - 4300rpm in 3rd, 3000rpm in o/d


if you like to race a lot, get the 4.10's.
As for installing them yourself, I say give it a shot. If you take the pumpkin out, expect maybe an hour or 2 with cleaning etc... closer to 2 if you take your sweet a$$ time, which is a good idea since they need to be near perfect.

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post #8 of 27 (permalink) Old 06-03-2004, 11:32 PM
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Justin and Aaron,
Do you guys ever travel in your 'birds with the high gears?
RPM's are one thing but the seat of the pants or maybe the lack of it if you travel is something a bit different...if that makes any sense at all...
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post #9 of 27 (permalink) Old 06-04-2004, 04:22 AM
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Quote:
Originally posted by Grasshopper
Justin and Aaron,
Do you guys ever travel in your 'birds with the high gears?
RPM's are one thing but the seat of the pants or maybe the lack of it if you travel is something a bit different...if that makes any sense at all...
Don't quite follow.....

I don't necessarily "travel". Have nowhere to go in Alaska
It is like 40 miles out to the track, and I range from 70-100mph on the trip to and back.... passing people doesn't take long at all even at higher speeds/rpms, and acceleration is still good at higher speeds.

I only posted the rpms/mph so he could see how much higher the rpms are at, at certain speeds vs. whatever gears he has.

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post #10 of 27 (permalink) Old 06-04-2004, 02:36 PM
 
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well With 4.10s you will need a Chip, or tuner,, so add another 400-600. Correct?
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post #11 of 27 (permalink) Old 06-04-2004, 02:47 PM
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Quote:
Originally posted by SkunkWorks
well With 4.10s you will need a Chip, or tuner,, so add another 400-600. Correct?
you can drive without a tune for the gears, but you will be limited to around 85mph w/ 4.10's.
A single custom program chip is around $325

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post #12 of 27 (permalink) Old 06-04-2004, 03:26 PM
 
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I'm going with 4.30s, and I have to drive 90 miles to the track.
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post #13 of 27 (permalink) Old 06-04-2004, 04:46 PM Thread Starter
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Hey everybody,
Thank you so much for your input. I think i'm gonna get the 4.10 gears. do you think $135 is a good deal. With 7k miles on em'.

Still curious. What are all the cons about them. I'm saying heck with the gas mileage. Gas isn't cheap but its well worth is when you rolling up some rice and smoking it. If ya know what i mean.

What kind of time loss should i expect on the 1/4 with the gears and a tuner?


Thanks,
Frank

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .
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post #14 of 27 (permalink) Old 06-04-2004, 04:55 PM
 
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with 3.73s alone I thin 6-7 10ths

I dont know with 4.10s and a tuner.. Maybe a full second on a good day? ( with good tires or slicks)

I'm sure someone with 4.10s will have some good times..
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post #15 of 27 (permalink) Old 06-04-2004, 05:00 PM
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Quote:
Originally posted by powerhouze
do you think $135 is a good deal. With 7k miles on em
No, I've seen brand new sets go for that much. try froogle.




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96 Alpine Green V8
98 Audi A8 4.2Q in Racing Green Totalled
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post #16 of 27 (permalink) Old 06-04-2004, 05:10 PM Thread Starter
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greenbird thank you. I almost wasted some money. I appreciate it.

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .
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post #17 of 27 (permalink) Old 06-04-2004, 05:30 PM Thread Starter
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http://store.yahoo.com/mustangtuning/rearend.html this looks like a good deal


hey i was wondering. would i need an installation kit or bearing kit?

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .

Last edited by powerhouze; 06-04-2004 at 05:35 PM.
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post #18 of 27 (permalink) Old 06-04-2004, 05:30 PM
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don't try installing them yourself...unless you really know what you're doing and you have ALL the tools

shop around, look for sum speed shops that sell them and install them

here in El Paso there is a shop that will get you a new set and professionally install them for a total price of $300, maybe you find a better deal

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post #19 of 27 (permalink) Old 06-04-2004, 05:42 PM Thread Starter
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I'm not afraid. I still talk to my high school mechanics teacher. He'll let me use the shop. He would have to be there if i was working anyways. I know he wouldn't let me screw it up. . I just know that i could get the ring pinion and bearings; install them myself and save a load of chash. that would still be under 300.

Thanks for the concern,
Frank

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .
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post #20 of 27 (permalink) Old 06-04-2004, 05:50 PM
 
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I guess he has backlash gauges and pinion depth gauges and what not...
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post #21 of 27 (permalink) Old 06-04-2004, 05:56 PM Thread Starter
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shoot you make a good point. i should give hima call and make shure he has all the tools. I believe he does because he used to build transmissions. You may be able to rent them from murry's .

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .
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post #22 of 27 (permalink) Old 06-04-2004, 06:23 PM
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I'd try and find a set of Ford Racing gears, slightly used (very slightly) or new.
Issues with used gears are if they weren't setup right the first time, they could wear quickly, or they coudl already be messed up.

See if I remember correctly. You need a crush collar, pinion nut, pinion seal, and some shims. You may end up needing bearings, or you may not. Summit sells some rather cheap install kits, or you can just buy the separate parts at a gear/driveline shop.

There are some good threads floating around about gear installs
here's one
http://forums.tccoa.com/showthread.p...ighlight=gears

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post #23 of 27 (permalink) Old 06-04-2004, 07:21 PM
 
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I did mine in my Mustang with an install kit ,FMS gears and Redline oil(with friction modifier) from Summit.

You'll need a dial indicator with a magnetic base,shims which are in the kit, misc. tools (recommend an inch pound torque wrench when tightening the nut for the pinion to get the right pressure on the crush sleeve) and a lot of patience to get the lash on the pinion and ring gear.

Don't quote me, but I think the tolerance is somewhere in the area of .007- .010.

Make sure that you break the gears in right and change the diff oil after 100 miles.

.02
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post #24 of 27 (permalink) Old 06-05-2004, 01:05 AM Thread Starter
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I hear you can get it done with just a dial indicator. I have no problem accessing one of those. and i know how to use it.
I'm shure i know enough people to where i could barrow a pinion depth guage though.
Thank you everyone for giving me input. I feel very informed.

99 trans w/2800 stall (thanks to Darrin and Dirtydog) Mac Underdrive, CAI, SSAutoChrome headers sitting in my closet (For Sale), ford factory 4.10 ring/pinion in the closet also(for sale) 2 mtx 6x9s in the back .
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post #25 of 27 (permalink) Old 06-05-2004, 01:07 AM
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post #26 of 27 (permalink) Old 06-05-2004, 06:26 PM
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If you have over 60k miles on the diff, replace the bearings.




Matt "Looks Like Egon" Davis
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98 Audi A8 4.2Q in Racing Green Totalled
02 Audi A8L 4.2Q in Black

I buy my OEM Ford parts at 10% over dealer cost from Steve in White Bear Lake, MN.
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post #27 of 27 (permalink) Old 06-06-2004, 01:34 AM
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Skunkworks, awesome link. I have most of those tools, maybe this isn't beyond me...

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