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post #1 of 10 (permalink) Old 01-10-2011, 07:16 AM Thread Starter
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Replacement Gears

Hello all, new to the forums and had a question about a gear upgrade. I have a 96 Tbird sport, with trak-loc. I recently have been having an issue with the slipping/chattering in the rear end, I am assuming its worn out, or previous owner did not use friction modifier at last lube change! I have been reading up on posts on rear end swaps/upgrades, so i think it is time for me to give it a try. I bought a used pumpkin from the junkyard, with trak-loc and 3.27 gears, cleaned it up and it is ready to install. I figured while i have the new one sitting out.....might as well upgrade the gears before installing. I have been searching the internet looking for new/used gear sets. Is there a difference between any of the gear sets? some say they fit the tbird, mustang, or f-150........or does it matter as long as it says fits 8.8? Also, of course it would be smarter to by brand new, but has anyone had luck with used gears pulled from other vehicles for a cheaper price?
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post #2 of 10 (permalink) Old 01-10-2011, 10:11 AM
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Any 8.8 gears will work. It is the trak-lok unit that needs to be IRS specific, but you already have that, so you're good to go.

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post #3 of 10 (permalink) Old 01-10-2011, 10:48 AM
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Unless you want noisy gear get OEM quality gears such as FRPP. Aftermarket gears are prone to noise.
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post #4 of 10 (permalink) Old 01-10-2011, 12:52 PM
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gears

Hi

I got my gears from Motive Gear, 3.90's
Don't notice gear noise.

But I also don't run mufflers, No Trac-lok either.

I found some 3.55's in a Bronco.


Paul [email protected]
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post #5 of 10 (permalink) Old 01-10-2011, 12:55 PM
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unless you want a noisy install, make sure you get everything settup correctly.
motive, frpp, summit, etc, will make noise if not settup corret from the get go.
its all in the installers hands.

even used gears are quiet when settup correctly.

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post #6 of 10 (permalink) Old 01-10-2011, 01:09 PM
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Please save yourself the money and time to have someone do it right. The cheapest install is not the best and can end up costing you more in the long run.

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post #7 of 10 (permalink) Old 01-10-2011, 04:08 PM
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I don't care who sets them up, cheap gears are cheap gears. I once took a set apart and changed shims 45 times and called the distributor 3 times. After all that I took the best pattern I could get which still didn't please me and they were noisy. I put a set of frpp gears in a car the same day, set them up once using a rotunda pinion depth gauge and they were silent. Depth gauges don't work on improperly cut gears. I have done hundreds of gear installs and have gotten motives quiet a few times, but usually aftermarket gears make noise. When I do OEM gears they are always quiet.
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post #8 of 10 (permalink) Old 01-11-2011, 09:37 AM
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well good for you.

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post #9 of 10 (permalink) Old 01-11-2011, 12:57 PM
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I'm no gear expert, but I have read that OEM gears are "lapped" together (like lapping valves) prior to being sold to ensure proper meshing/alignment and low noise. I don't know as every aftermarket company does this, but I would think the reputable ones would.

Personally, I've only changed gears a few times in my life, always with "used gears", but shimmed them properly, checked clearances, and never had a problem.

~Rick

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post #10 of 10 (permalink) Old 01-11-2011, 01:07 PM
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I actually have really good luck with used gears. The only thing that ever gives me trouble are cheap aftermarket gears. Motives are a bit difficult to adjust but will work good with minimal noise. No names gears are trouble. I have always liked yukon gears until about a year ago. Before that they were OEM gears now you can see the difference looking at them.
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