Help with rear build - TCCoA Forums
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post #1 of 7 (permalink) Old 11-14-2016, 11:36 PM Thread Starter
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Help with rear build

Hey guys I've read through all of the differential posts and have learned just enough to get started but also enough to screw up!

Stock 96 bird getting ready for new drive train. I'm working back to front. I have a 96 Mark VIII donor so I'm pulling the aluminum carrier from that. I bought a new 3.73 ring and pinion (FRPP) and I have a used traction lock being shipped. It is supposed to be from an IRS but I wont know for sure until it gets here. If it is not, I will get an IRS traction lock for the build. I have a local shop performing the build for me.

My questions are: What else do I need? I plan to use the half shafts that are in the best condition (as a pair) unless there is a better way?

Solid spacer vs. crush sleeve?

I know I will need a traction lock rebuild kit? I'm guessing a new differential mount bushing? I see something about a brace as well? Anything else while I am in there? I did sway bar a couple of months ago and will look at the LCA's again and probably make that change and rear discs too while I am in there since the Mark VIII will provide these items.

I should mention that the car will be getting an upgrade trans next followed by a built 4.6 4v with a blower. Not looking to do a ton of 1/4 mile runs but more like a street/sleeper.

Any help/advice on the parts for the rear would be greatly appreciated! A link to any information would also be helpful! You guys rock!
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post #2 of 7 (permalink) Old 11-15-2016, 04:01 AM
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If you're going to do much racing - the Mark VIII aluminum pumpkin is lighter, but it is aluminum. The cast iron MN12 pumpkin is a bit stouter at the limits.

Also, you can buy a reusable "crush sleeve" replacement; I'd opt for that if I were building.

RwP

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post #3 of 7 (permalink) Old 11-15-2016, 11:58 AM
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I used these bushings: Energy Suspension 4.1126R Differential Carrier Bushing (~$30 from Amazon)

I found the best price at the time for the FRPP Trac-Lok Rebuild Kit With Carbon Fiber Clutch Packs 8.8" - M-4700-C (comes with heavy S-Spring) ($108 from CJPonyParts)

My thread from this spring may be helpful to you, thought not all-inclusive: http://forums.tccoa.com/960-differen...verything.html

I used the Steeda brace I bought on eBay, if I had it to do again I'd probably use the FRPP cover. Be advised the Steeda brace won't work with one of the rear covers, see my issue with that here: http://forums.tccoa.com/960-differen...oesnt-fit.html
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post #4 of 7 (permalink) Old 11-23-2016, 09:39 AM
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My Differential is bullet proof, and I'm using a manual transmission with high gear ratios in it. My setup is a cast iron housing, with 3.73 traction lock, cobra carbon fiber clutch packs, GT500 pinion bearing, 03 cobra pinion flange, Ford racing IRS differential girdle (needs slight grinding but fits like a glove), and a performance art works differential rear mount with poly front diff bushings. This setup is the bees knees. I RECOMMEND THE SOLID PINION SPACER!!! I got mine from Yukon gear and axle. It's a great piece of hardware with a shim kit so you can get the preload set just right, it is also impossible for it to lose tension, or crush further from insane launches; so far I've given the whole setup hell and it just takes it like a champ.




Any questions, lemme know; I set it all up myself.
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post #5 of 7 (permalink) Old 11-23-2016, 03:53 PM
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Is it pretty straightforward to get the ring & pinion shimmed up perfect when adding a genuine Ford Trak-lok?

My car is quiet as a mouse, and I hope to keep it way after getting the trak-lok installed (by a very reputable shop BTW.)

Al

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post #6 of 7 (permalink) Old 11-23-2016, 07:19 PM
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Quote:
Originally Posted by T6Rocket View Post
Is it pretty straightforward to get the ring & pinion shimmed up perfect when adding a genuine Ford Trak-lok?

My car is quiet as a mouse, and I hope to keep it way after getting the trak-lok installed (by a very reputable shop BTW.)

Al
Assuming you leave the factory shims in place, it should line up just fine. If you mix them up, or change them; you're gonna have a bad time.



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post #7 of 7 (permalink) Old 12-11-2016, 10:26 PM
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From helping build this differential, it is whisper quiet.

Michael M. ASE P2 Automobile Parts Specialist.

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