armybyrd

iTrader: (4)

Found a guy selling 2 rear ends from '98 ls1 cars. The stock one doesn't include brakes and is from an auto car. The other has an aftermarket diff cover and is supposed to be 343 gears. I'll be driving a hour and a half to get them but I will pull the cover to get a better look. Both for $175. I just wanted to make sure they are 4 th gen fbody rears before I waste my time and money.

-thanks

big gear head

Looks like it to me. I don't recall any 3rd gens having the speed sensor on top of the housing.

armybyrd

iTrader: (4)

What all should I look for? Is it pretty simple as far as looking at the gears once the diff cover is off? Metal shaving or messed up gears?

tealman92

175 for both I wouldnt concern myself with the shape of the gears just rebuilt the one your gonna use before you put it in your car. Most of the f-bodys being parted have 100000 plus miles

armybyrd

iTrader: (4)

If the one does need to be rebuilt how much am I looking at? These years are rebuildable and have the better zexel posi? I don't know much about tears-still reading up on the 4th gen swaps.

big gear head

Be sure that they don't have the Auburn. If they have the Torsen then they are worth it.

armybyrd

iTrader: (4)

How can I tell the difference?

RamIt

I'm pretty sure the torsen did not get installed until 99.
I had a 98 with a clutch type posi in it. My 2000 TA had the torsen.

big gear head

If you look inside the differential and you see 5 coil springs then it's the Auburn.

armybyrd

iTrader: (4)

I asked the seller to remove the diff cover and take a pic but he said he'd have to unbolt all the preloads? Is this true or can't you just unbolt the actual diff cover?

big gear head

He is talking about the preload bolts in the TA Performance cover. It's no big deal to do it, he just doesn't what to mess with it.

armybyrd

iTrader: (4)

Can I just unbolt it all to inspect the gears?

big gear head

Yes, but the preload will have to be set again. It's an easy thing to do, but requires a small torque wrench and thread sealer.

armybyrd

iTrader: (4)

Well after a 4 hour drive round trip later I've got both rear ends in the bed of my truck. Snapped a few pics-both have the "TA" diff covers. One is supposed to be 2:73 gears and the other a 3:43.



This must be the auburn since it has springs I'm assuming?





Do these numbers mean anything?

















No springs like the other-is this a zexel torsen?

RamIt

You scored the torsen

armybyrd

iTrader: (4)

Not sure if you can see well enough by these pics but do they look ok? To me nothing looked out of the ordinary-gears looked fine with no metal shavings.

big gear head

You got one Auburn and one Torsen. The Auburn has a 2.73 on it. Can't tell what the other one is.

valicswarrior

iTrader: (1)

thanks for the thread, let me know I got a good rear for my car. Never knew how to tell torsen vs auburn until I read this. (got mine for free from a dude that wanted a "junk" car out of his driveway lol.)

big gear head

I didn't notice before, but the rear end with the Auburn has a bearing cap stud kit in it.

keykey

It looks like the Pinion teeth has rubbed on the auburn diff? It looks like teeth-marks on the diff centre, no?

big gear head

Either the pinion nut came loose or a pinion bearing failed at some time. I've seen them a lot worse than that.