irocbsa

Well I found a rear end but the only thing is that its an open one. The want around 800 more for a posi unit. My question is: Can I just find a posi unit like the SLP Torsen and have someone install it. If not what else do I need to do this. I'm really in a bind here..........
bsa

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"If they do not run, Then they will die." - Stonewall Jackson

'87 IROC, 355 TPI,700R4, Trick Flow Heads, Comp Cam, Comp 1.6 Rockers, Lucas 23# injectors, Edelbrock headers, Flowmaster 3'' exhaust, gutted cat,
Mallory coil, Mallory HyFire IV ignition box, Mallory Sidewinder 8mm wires, Autolite platinum plugs, K&N filters, Transgo Performance Shift Kit, Corvette Servo, 2,000 Torque Converter

Dana92RS

Yes, but keep in mind the following about the SLP Zexel-Torsen take-off posi unit:

- It only fits 10-bolt rears.
- It can only be used with 28-spline axles.
- It is a 3-series carrier

So, if you get an open 10-bolt rear with 28-spline axles that already has 3-series gears in it, than yes, it should go right in. If the rear does not have 3 series gears then you will need to get some to work with it, same for the 28-spline axles. If it's a 9-bolt rear, forget about it. Even if you have to get new gears, for $99 the Zexel-Torsen take-off diff is a great deal. I got one that I plan to put in my 2.73 open rear, along with some 3.42 gears. I think they are still $99, at least they were a couple of weeks ago when I got mine. I ordered p/n 64501T. Hope that helps.

Dana92RS

I just checked SLP and the part number 64501T still shows $99. It says it is an OEM Zexel-Torsen differential. They also offer a heavy duty Zexel-Torsen diff (p/n 65002) for $299. I don't know what the differences are, maybe the HD one is new while the other is a take-off unit. The $99 diff is good enough for me.

five7kid

iTrader: (14)

Putting any posi carrier into your open rear will run you from $400-600, when you figure parts and labor (you shouldn't try this at home). Even more if you want new gears.

However, if you're satisfied with the gears, put in a PowerTrax unit. All you need to know is the number of splines on your axles (26 if older, 28 if newer). This you can do at home, for about $350.

Also, if you had searched the boards, you would have found all the answers to your questions in posts in the last 20 days. Sorry, needed to say that, no flame intended.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

irocbsa

5.7, yeah I realized that right after I posted. Sorry, need to think ahead. If I already have the rear end do you rally figure that much to put it in. They already have to do the labor of putting the thing on the car, about 400. The on I am looking at is a out of a 91z. All the Zs had 28 spline after 88 right........
bsa

Dana92RS

Yes, the 91Z rear should have 28-spline axles. Is it not a posi rear? I thought all '91-92 Z28's got posi rears, I guess I could be wrong though. A local shop quoted me $250 to install my Zexel-Torsen unit with new gears. That price did not include the gears (about $200) or the Zexel-Torsen unit (got it for $99 from SLP) but did include the install kit. So the total for me would be around $600. I have never swapped an entire rear out so I don't know everything that has to be done but $400 just for labor seems kinda high to me.

irocbsa

The guy said it wasn't a posi rear. Now I need to know if he's lying about it being from a z-28. I thought that some of them came w/o posi. BTW, thanks Dana, you've been a huge help with this whole mess.

Dana92RS

No problem-o! Definately check out that rear. I was under the impression that they all got posi rears (as well as rear disc brakes), but like I said I may be wrong.

irocbsa

Does anyone know if all Zs in 91 came with posi rear ends. Your help is greatly appreciated. Was there a difference between the units they put in the Zs and the units they put in the RSs. I don't think there was but I would like confirmation. Thanks.
bsa

Kevin91Z

iTrader: (1)

As far as I know, all 91-92 Z28's have positraction rears. But they dont all have disc brakes. Disc brakes were an option. Is it a disc or drum rear? I think all disc brake rears are posi, while drum rears could be either, depending on the car it came from.

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irocbsa

It is a drum rear. I hope this guy ain't ****in me...........
bsa

[This message has been edited by irocbsa (edited November 28, 2000).]

Pat Hall

iTrader: (31)

Dana, an honest repair shop should only charge you between $150 - $200 to install gears and a carrier. If they're charging you more than that, you better take the jar of vaseline with you when go to pay your bill! The shop I worked at did them for $150. My suggestion to the guy you're trying to help on here would be to take just the rearend to a shop and have them set it up, then take it home and swap it out. They're so simple to change out, I'd hate to see him get charged for that too. I swapped mine out in about 2 hours using jackstands and fairly common tools. The hardest thing I encountered installing it in the car was just finding an extra body to work the pedal while I bled the brakes! Good luck, and don't let a greedy shop snow you on high labor costs!



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89RS w/350 TPI; 69RS/SS w/450 HP 350/Muncie 4-Speed "Too weird to live, too rare to die."

irocbsa

Is there a procedure spelled out anywhere for swapping out a rear end. I think I may go this route. Anybody........
bsa

TomP

Yep- it's in the Haynes 82-92 Camaro manual. It tells you how to remove/install the axle.

There's some brake differences that we can help you out with on the Suspension/Chassis/Brakes message area. The main cutoffs for changes were 82-83 / 84-88 / 89-92, and rear drum / 4 wheel disc.

If the axle's from a '91 and going into your '91, and both have the same braking systems, you just have to swap axles.


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five7kid

iTrader: (14)

Get at least a Haynes manual, it will have what you need for this job and a lot more. About $15.

Another suggestion to find out what you have: You'll want to put fresh gear lube in it anyway, so take off the 10 bolts that hold on the cover, and take a look at what's inside. 1st, in the carrier, are there small gears only, or are there plates & springs? If the latter, you have a posi. Then, look at the numbers stamped on the ring & pinion gears. This will tell you the gear ratio (divide the larger by the smaller). If you can't find the stamped numbers, count the teeth on each.

Finally, look at the 3-charactor code stamped on the front of the passenger side axle tube. Compare that to what the Haynes says it should be to determine if anyone has modified the rear.

It took me about 4 hours to do the swap, but I had to change the wheel cylinders because I was putting an '86 rear into an '82 (tubing type changed between those years). But, you won't have that problem. It isn't that hard of a job, and I wouldn't suggest paying someone $400 to do it unless you really don't have a place to work on it.

irocbsa

If I get a drum rear from a 91 and put it in a rear drum 87 are there any difference that I need to be aware of between the two years. Are there any strange or uncommon tools I will need to do this. I'll pick up that haynes manual tonight. I had one but it got destroyed. Thanks.
bsa

irocbsa

ttt

zippy

according to records, all z28 packaged cars had limited slip standard starting 1990. (well, 1990 would be iroc, not z28).