Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Rear end options

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Old Dec 7, 2020 | 03:20 PM
  #1  
92RSv6's Avatar
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Rear end options

My rear end seems to be failing again. It was replaced with a used unit about 3 years ago for reasons of getting it back up and running quickly.

I know the V6 axle spline count is different then the V8 rears. What about the drive shaft to rear yoke? Is it possible to swap in a complete V8 rear end? I eventually plan on rebuilding the whole car. At which time a big block will be going in. So installing something that helps move me in the direction is preferred if possible.

For now I need to focus on one project at a time, and need to finish the rebuild of my 1968 F100 before I give the Camaro full attention. It just needs to run for now.

Thanks.
1992 Camaro RS mostly stock. Minor mods only.
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Old Dec 8, 2020 | 11:47 AM
  #2  
midias's Avatar
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Rear end options

I thought they were the same 26 splines except for 90-92 cars with 28 splines. The trans input shaft is different in spline count. Driveshafts should be the same I think direct swap.
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Old Dec 8, 2020 | 05:50 PM
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From: Central NJ
Car: 86 Trans Am
Engine: 408 stroker sbc
Transmission: TKO600
Axle/Gears: Moser full floater m9, 3:70 trutrac
Re: Rear end options

It will all swap right over. Brakes may require some adaptation but the rest is all the same
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Old Dec 8, 2020 | 09:49 PM
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From: Aridzona
Car: `86 SS / `87 SS
Engine: L69 w/ TPI on top / 305 4bbl
Transmission: `95 T56 \ `88 200-4R
Re: Rear end options

A V6 rear for 3 years is a great option. It bolts in. It's cheap. It probably has better ratio than a V8 rear. It works with what you have now, and will work with what you have planned.

A V8 rear could have gearing that sucks (2.73) for what you have now. 28 splines is all fine and dandy but doesn't help make the car get repaired and be functional. It's kind of like chrome. It doesnt get you to work to make more money, no matter how much you think you need it.
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Old Dec 8, 2020 | 10:06 PM
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Re: Rear end options

6-cyl & V8 spline counts are the same; 26 up to 88, began changing over to 28 in 89, changeover complete in 90 sometime.

Same as S trucks.

Everything else about 6-cyl and V8 rears is IDENTICAL externally. U-joints bolt up, length is the same, etc. etc. etc.

Worst things about 6-cyl rears are that they almost NEVER came with posi (although, considering that a "posi" in such a rear would have been an Auburn, maybe that's not so bad after all); almost NEVER came with disc brakes (for 88-back, same deal as posi: might be better to have had drums than the Saggy discs).

Good things about 6-cyl rears include that they typically had better gears than V8s came with, and they typically haven't been abused near as bad, given the lameness of the predominant 6-cyl motors in these cars, and they're PLENTIFUL and CHEEEEEEEEEEEP.

There is NO REASON WHATSOEVER to seek out a V8 rear for your situation. Just get another 6-cyl one and keep the change in your pocket.
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