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post #1 of 16 (permalink) Old 02-04-2010, 06:36 PM Thread Starter
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Convert to TL

What all would I need if I wanted to make my 8.8 open to a TL w/o changing the ratio. Have axle code Y (3.08).

If all else fails get a bigger hammer!

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post #2 of 16 (permalink) Old 02-04-2010, 06:56 PM
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Pick up a traction lok.

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post #3 of 16 (permalink) Old 02-04-2010, 07:05 PM
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While you've got the rear end apart you might as well change the gears. IMO you'd be a fool not to.

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post #4 of 16 (permalink) Old 02-04-2010, 07:33 PM
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You need an 8.8 trak-lok unit specifically for IRS, and make sure it has the 28 spline side gears. Easiest way is go get a complete diff out of an SC at the junkyard.

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post #5 of 16 (permalink) Old 02-05-2010, 06:18 AM Thread Starter
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Thought there would be a better solution that changing the whole pumpkin. Can't just get any TL and use IRS Gears?

As far as the gears its the wife's car and she like the top end.

If all else fails get a bigger hammer!

93 SC Tbird
MPII w/ Plenum,90mm MAF, 85mm TB, 40# Injectors, 255 lph FP, Double IC w/fan, SCT Chip (Tuned by Jerry),3/4" Raised Top, F52-TT TC, SilverFox AOD 550, SPT-R VB
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post #6 of 16 (permalink) Old 02-05-2010, 06:56 AM
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Quote:
Originally Posted by bowez View Post
Thought there would be a better solution that changing the whole pumpkin. Can't just get any TL and use IRS Gears?

As far as the gears its the wife's car and she like the top end.
Yes, you can just get a TL unit and gears, but it is easier just to swap the whole pumpkin. Most people don't have the ability, tools or confidence to properly set up the gears so they mesh correctly, which is required if you are installing a new traction lock unit. If you just buy a pumpkin with the traction lock unit (and the gear you want) already installed, it is easy to rebuild the TL without needing to re-setup the gears.

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post #7 of 16 (permalink) Old 02-05-2010, 09:30 AM
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Quote:
Originally Posted by MadMikeyL View Post
You need an 8.8 trak-lok unit specifically for IRS, and make sure it has the 28 spline side gears. Easiest way is go get a complete diff out of an SC at the junkyard.
The SC's 5 spd have a 2.73 gear, autos 3.27, IIRC. Wouldn't the 2.73 make the trans shift early at WOT, the same way that a low gear makes it want to hit the rev limiter w/o a tune?

I am also 3.08, and considering a trak-lok so I can drive farther than 50 ft in the snow!

Al

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post #8 of 16 (permalink) Old 02-05-2010, 09:50 AM
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Yes, the 2.73s could mess with the shift points a bit, but then again if you are swapping to 2.73s you probably aren't too concerned with all out performance. I was actually just suggesting that he get the complete pumpkin from the junkyard because then he can either keep the 3.27s, or if he really wants the 3.08s he can just swap the 3.08 ring gear onto the TL unit, and he won't have worry about setting everything up, just needs to double check the tooth pattern, and worst case adjust the carrier shims.

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-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
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post #9 of 16 (permalink) Old 02-05-2010, 05:16 PM
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Quote:
Originally Posted by MadMikeyL View Post
Easiest way is go get a complete diff out of an SC at the junkyard.
I always LOL when I hear this....as if junkyards everywhere are just teaming with SCs ripe for the picking apart.

Seriously, though it's your best bet to have another pumpkin already set up from a shop that does that thing. It's easy enough to swap out the whole pumpkin then, and your car has a minimum of downtime.

So the points of interest here are:
The gears have to come out to install a TL.
The TL or open carrier has to come out to install new gears.
You can rebuild the TL without removing the carrier or gears.
Changing out the whole pumpkin is way quicker than changing out just the carrier/gears.

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post #10 of 16 (permalink) Old 02-05-2010, 11:32 PM
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I find quite a few SCs at junkyards. I can set up gears myself, and if I wanted a TL with 3.27 gears, I wouldn't bother building one, I would just look for a complete diff and swap it out. With that being said, it isn't hard to set up gears, and it is even easier if you want to keep your current gears and just swap from an open diff to a TL because you don't even need to touch the pinion gear. That means no messing with the crush sleeve, no checking pinion depth, fewer shims to keep track of, etc. The only thing you would have to do is remove your open diff from the housing, keeping track of which side each of the carrier shims are on, then swap your ring gear from the open diff to the TL diff, then put it back in, putting the shims in the original locations, and double check the tooth pattern. If he really wants 3.08s and not 3.27s, this is what he should do. If he wants the quickest, cheapest, and easiest way, get a 3.27TL diff, change the fluid, and swap out the whole pumpkin.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
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post #11 of 16 (permalink) Old 02-06-2010, 11:11 AM
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That's what I was saying. Quicker to have another pumpkin ready to go and then swap the whole thing out.

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post #12 of 16 (permalink) Old 03-06-2010, 05:22 PM
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my brother has a wrecked 94 sc,I had plans to swap out the pumpkins but does every SC come with a trac loc,its a automatic,but im just wanting to make sure that ever SC comes with a trac loc,cause his car dont have the sticker in the door jam so the only way I can find out is if I took the pumpkin apart,but I really dont want to do that.please help,and does every automatic SC come with 3.27's?

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post #13 of 16 (permalink) Old 03-06-2010, 05:32 PM
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there should be a tag on the pumpkin itself

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post #14 of 16 (permalink) Old 03-06-2010, 10:09 PM Thread Starter
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94 SC Auto should be a Open diff and not a traction-lock.

If all else fails get a bigger hammer!

93 SC Tbird
MPII w/ Plenum,90mm MAF, 85mm TB, 40# Injectors, 255 lph FP, Double IC w/fan, SCT Chip (Tuned by Jerry),3/4" Raised Top, F52-TT TC, SilverFox AOD 550, SPT-R VB
96 1/2 XR7 Sold and Salvaged
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post #15 of 16 (permalink) Old 03-07-2010, 01:28 PM
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If you can get the rear wheels off the ground, it's real easy to tell. Turn one rear wheel, if the other goes same direction, it's got clutches (lok), if it turns the opposite direction, it's an open...
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post #16 of 16 (permalink) Old 04-05-2010, 04:28 AM
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alright,ill try that,thanks NetKeym

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