mark viii rear end swap+ gears - TCCoA Forums
 
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post #1 of 9 (permalink) Old 11-28-2012, 12:31 PM Thread Starter
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mark viii rear end swap+ gears

I was wondering if I could take the pumpkin off my mark parts car and though some 3.73s in there. If I did would it swap in my thunderbird without any mods?
My plan was to just "build" the mark viii rear end so I wouldn't have much down time to my car?and to save the weight

And another quick question, is there a jmod kit I can buy?

Performance mods-
4.6 from 93 mark viii, 93 mark viii driveshaft, smoothed intake tube, custom tune
Interior mods-
Alpine 7in headunit, 2 competition 10s ran by a 1200 watt amp, 0 gauge wire, jl door speakers with seperate amp running them, custom leather seats with thunderbird logo on back, shaved interior peices, painted interior.
Others-
17in rims, painted brake calipers, newish paint job, clear corners, 5% tint, remote start
Future mods-
Install my fin, lowering kit, shave trunk lid, all the aluminum parts I can get off my mark, 3.73s, j mod, hood scoop
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post #2 of 9 (permalink) Old 11-28-2012, 12:35 PM
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Yep it's a direct fit.

And Robertp was selling a few Jmod kits a while back might want to send him a PM

-Patrick
[email protected] on used street tires
See profile for full list of mods

Pics here.. http://forums.tccoa.com/showthread.php?t=129479
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post #3 of 9 (permalink) Old 11-28-2012, 12:49 PM Thread Starter
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Quote:
Originally Posted by Tbird1997 View Post
Yep it's a direct fit.

And Robertp was selling a few Jmod kits a while back might want to send him a PM
Okay awesome! I'm not the best in rear ends so, do all i need is the ring and pinion? What's a Trac loc? Is that to lock both wheels instead of only one spinning? Sorry for the nooby questions.

Performance mods-
4.6 from 93 mark viii, 93 mark viii driveshaft, smoothed intake tube, custom tune
Interior mods-
Alpine 7in headunit, 2 competition 10s ran by a 1200 watt amp, 0 gauge wire, jl door speakers with seperate amp running them, custom leather seats with thunderbird logo on back, shaved interior peices, painted interior.
Others-
17in rims, painted brake calipers, newish paint job, clear corners, 5% tint, remote start
Future mods-
Install my fin, lowering kit, shave trunk lid, all the aluminum parts I can get off my mark, 3.73s, j mod, hood scoop
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post #4 of 9 (permalink) Old 11-28-2012, 01:15 PM
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Yes, a Trak-lok is a limited slip differential, basically Ford's version of a posi. You can swap just gears and leave the open differential, or you can replace the differential with a trak-lok unit, as long as it is one meant for an independent rear suspension. As for what you need to swap gears, you will need the matching ring and pinion, as well as a new crush sleeve, an inch-pound dial type torque wrench to check pinion bearing preload, a dial indicator to check the backlash, and you should have a shim kit in case you need to make any adjustments, but start with the factory shims that go with the housing in the original locations and it will most likely be good.

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post #5 of 9 (permalink) Old 11-28-2012, 02:05 PM
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8.8 IRS Gear Swap

Here's a small run-down of the tools needed:

-Case Spreader (needed for Aluminum Mark VIII Case)
-Dial Indicator w/magnetic base
-[Inch Pound]Torque Wrench (needed to test preload)
-[Foot Pound] Torque Wrench
-Gear Marking Compound.
-Hydraulic Press (bearing removal/installation on the carrier and pinion)
-Bearing/seal installation tool (optional - axle seals)
-Slide hammer (optional - remove old seals and bearings)-
-Extra crush collars for the pinion.
-Ultra Black RTV for the edges of the seals as well as the diff cover.

I may have missed something..

Here's a link to an excellent 8.8 Gear Swap Write-Up--->>8.8 Gear Swap

Personally I don't recommend this job for a beginner..

For a properly set-up Aluminum Mark VIII Differential...It's not just a matter of swapping gears from one case to another..

The Aluminum Mark VIII Differential has to be set-up with strict tolerances..I wish you a lot of luck if you try this on your own!..



Rayo..

.
.
1991 Ford Thunderbird Sport

"If you don't know where you're going..Any road will take you there." George Harrison
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post #6 of 9 (permalink) Old 11-28-2012, 02:06 PM
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don't over crush the crush sleeve.....you will have to get a new one. I was lucky my first go round.

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rest in peace JL
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post #7 of 9 (permalink) Old 11-28-2012, 02:54 PM
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Quote:
Originally Posted by _95badbird View Post
don't over crush the crush sleeve.....you will have to get a new one. I was lucky my first go round.
Tip: buy a few crush sleeves just in case.
They are super cheap from rockauto.com and adding an extra one or two won't change your shipping costs.
-g

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post #8 of 9 (permalink) Old 01-04-2013, 10:30 PM Thread Starter
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What gears would yall recommend for me? 3.73s? I do about 50/50 highway/street driving.

Performance mods-
4.6 from 93 mark viii, 93 mark viii driveshaft, smoothed intake tube, custom tune
Interior mods-
Alpine 7in headunit, 2 competition 10s ran by a 1200 watt amp, 0 gauge wire, jl door speakers with seperate amp running them, custom leather seats with thunderbird logo on back, shaved interior peices, painted interior.
Others-
17in rims, painted brake calipers, newish paint job, clear corners, 5% tint, remote start
Future mods-
Install my fin, lowering kit, shave trunk lid, all the aluminum parts I can get off my mark, 3.73s, j mod, hood scoop
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post #9 of 9 (permalink) Old 01-04-2013, 11:36 PM
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The 3.73 and 4.10 sets come highly recommended. Less interstate use and then 4.30s look even better.

Delete my account.
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