My 88 Sport Coupe has the 2.73 open. On a hard takeoff I peel too much then whel hop my way into backing off the throttle.

I want to go posi, but I don't know if my car is 26 or 28 spline.

I have thought about the problem a lot and i believe I have the cheapest solution(oh yeah money is an issue cause I am a dad supporting a family).

Soes anyone have a used but working 2 or 3 series posi differential from an early thirdgen 10 bolt rear laying around they want to sell cheap(3 series) or give to a good home(2 series).

I am in Charlotte. NC

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1988 Camaro Sport Coupe305TBI-4spdAOD-2.73open in "bought stock" condition. That'll change if it stays around here much longer

 

Yours should be a 2-series carrier with 26 spline axles. If you're keeping the gears, all you need to do is get a Posi unit. You can get a Zexel Torsen take-off unit from SLP for cheap. I think it will work in your 2-series carrier.

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Bob '89 Formula CC350
Last(lost)Member of the Elusive Great Lakes Crew
My car's homepage

 

See, that is the problem ... the Zexel-Torsen from SLP is for later 28 spline axles. Mine stand the best chance of being 26 spline axles so it will not work without me buying $300 worth of axles.

But this concept of when the 26 to 28 spline swap was made has so many wrong answers it is not even funny.

The manufacturers of ring/pinion gears list early-to-87, and 88-to-later for their ring/pinion sets.

Folks on this message board say 89 was the cutoff year. Some people say 87 was the cutoff year. Some people say the 28 spline axles were phased in over the 88 year.Some people say the 28 spline axles were phased in over the 89 year.

The truth seems to be mainly that there is no clear cutover date or even time frame for 26-to-28 spline axles being phased in to production.

It comes down to "take off the cover and count" most of the time.

So, i figure I'll get a useless to most people 2 series 26 spline posi carrier.
Then when i open up my diff if i can count to 28 I'll call SLP and pass the 2 series 26 spline carrier on to someone else who wants it.

If i can only count to 26 I'll put in the 2 series carrier and order up some 3.2x or 3.4x gears for a later install and run the 2.73 gears, but at least with posi now.

Mike.


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1988 Camaro Sport Coupe305TBI-4spdAOD-2.73open in "bought stock" condition. That'll change if it stays around here much longer

 

You can get an Auburn 2-series 26-spline posi unit from Jegs for $300...

For an 88 SC I'm 99% sure you have 26 spline axles.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

I have a 89 and thought for shure I would have 28 spline axles> When I pulled one and couted it I had a 26 spline. I found a HD torsen posi on ebay and picked it up pretty cheap. Go to ebay and type posi in the search. I have seen some 26 spline posi carriers go pretty cheap.

 

Some 88s came with 28spline. I know because I took a 28 spline axle off one and have it in my garage right now!

Just yank out your axle and count the splines. I have a posi for 28spline I may sell. Not sure though.

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN93, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires, fastchip, Bosch O2sensor, Bosch in-line pump(w/stock pump), SLP headers & catback,short shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

[This message has been edited by theformula (edited February 13, 2001).]

 

I have a 26 spline posi carrier w/ 4.11 gears that appears to be in pretty good shape I could get rid of. E-mail and let me know if you might want it.

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1986 IROC
New Crate 350 w/Vortec Heads, Edelbrock 2116 Vortec Manifold, Edelbrock Performer 2102 Cam, Edelbrock 1406 carb, Hedman shorty headers, Flowmaster Catback, Rebuilt 700r4 w/vette servo, etc..

 

Mike, do you have the tools for and are good at setting up gears? If not, and you're keeping your current gears anyway, then perhaps the least expensive solution is to get a PowerTrax conversion unit. You still have to know how many splines your axles have, but the only cost would be the unit, a cover gasket (or RTV), and gear lube; since you don't disturb the carrier or pinion gear, no special tools or skills are required.

If you buy a carrier, even a used one, you'll have to pay someone to set up the gears on it. I've heard of people getting it done for less, but a trustworthy shop here quoted me $300 for labor alone. Even if it's only half that, you're probably still ahead with the PowerTrax.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/LB9 block, ZZ3 cam and intake, WP 305 heads ported & polished, Hooker headers & y-pipe, hi-flow cat).
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 & Trans-Scat shift kit, 3.08 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

who is charging you 300 bucks for axles? i did a 26 to 28 spline swap on my S10 and i paid $50 for a PAIR of axles. i know the parts guy, but if i didn't, it would have been around 100 to 125. these axles are used, though. i would get the slp and some 3.23 or 3.42 gears. mine has 3.42 gears with 27 inch tires and turns 2600 at 60 mph with no overdrive. you are right about the slp carrier, it holds 3.23 and up (numerically) gears.

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88 S10
Dropped 3/4
18" Boyd Coddington Timeless 5s
Dart equipped 406
12.20 @ 115.25 mph

 

are S10 10 bolts the same as thirdgen 10 bolts?
My Formula is non posi but I have a parts S10 with 3.42 gears and posi.

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Member of The Connecticut F Body Association
Proud owner of the slowest L98 in the North East
1987 IROC 5.7 - 16.43 @ 82 the project
1986 S10 4x4 w/93 Vortec 4.3 - the nitemare
1988 Formula WS6 - the Cow

 

I'm holding a 26 spline 2 series posi that should be in good shape. It has over 100k miles, but the majority of it is highway. The guy i got it off of was meticulous so he put in an auburn pro series when he went with 3.42s. It's got a 2.73 ring gear on it.
Anyhow, if you decide you want to go the posi route instead of locker, make me an offer. Also would help to check if you have 26 or 28 spliners, 88 was a transitional year.
...ed