I was told it does... is this true? I'm wanting SLP's $100 carrier, but it says for '88-'01 models EQUIPPED with 28 splined axles. Does this mean I may not have them or what? Thanks for any help... just want to get this thing all done. I'm also assuming these are 3 series carriers? Later

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'91 GTA:
www.fbody.com/members/91WS6GTA

 

Yes, all 90+ thirdgens have 28 spline axles. Or, they should...

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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=-

 

OK, THANKS again Kevin. You help me alot! How's that L98/ZZ3/LT4 Hybrid running? 12's yet? Hopefully soon!! I bought a T56 for mine this weekend. I figured I'd wait on the intake base and such. I want to "bullit-proof" my tranny and rear b4 I put my L98 in. Talk to you soon

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'91 GTA:
www.fbody.com/members/91WS6GTA

 

The carrier depends on the ratio. 3:23 and up have the 3 series while anything lower than 3:23 has the 2 series.

I am doing a similar swap. It took me 4 months to find 28 spline axles cheap and close enough to me!!

I have the SLP take-off posi sitting in my basement. It looks pretty nice. Too bad i will never really see it again!

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• 89 Formula 305 WS6
  SFC's,
  LCA's,
  Air foil
  Flowmaster cat back
  Tranny Cooler
  A/F Ratio Meter (not a mod but it sure spurs interest)
  Trans Temp Gauge
  Most "Free" Mods
• 90 Eagle Talon 2.0
  (winter beater)
  Mods? HA! its a rice burner!

 

I'm here to help.

Lucky you, I'm saving up for a T56 now! I still havent gotten to the track, its one thing or another. Hopefully on the 31st. You're doing the smart way, I did the stupid way and put the big engine in first, then replace parts as they break.

------------------
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=-

 

hahahahaha

*Hey- I talked to a guy at SLP today and he said that '91s could have 26 or 28 spline axles. He said the only way to tell is to pull the axle and see. I really don't want to do that just to see. Is he right? This would mean extra down time for my car. He also said the carrier would be nonreturnable also. What should I do??? I guess I'll just have to pull an axle. I'm just wanting my 4.10's and posi unit in

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'91 GTA:
www.fbody.com/members/91WS6GTA

 

Check you axle code. I believe the guy at SLP is mistaken (though GM is capable of anything). All 1991s were SUPPOSE to have 7 5/8" ring gears with 28 splines. If you have a 7 5/8" ring gear then you MUST have 28 splines, only the 7 1/2" ring gear came with 26 splines.

And to the best of my knowledge, all 1991s had 7 5/8" ring gears.

 

Glenn is correct!!!!

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92 GTA(only 226 made)ort matched sportsman heads with 2.05 valves,64 cc,milled .015,.028 head gaskets,port matched Accel runners,port matched plenum,port matched edelbrock intake,flow matched injectors,jet hot headers and 2.5" mandrel bent exhaust,Flowmaster muffler,underdrive pulleys,slp cam,1.6 rockers,slp cold air induction,52mm throttlebody,performance resource custom chip,Dyna module,Screamin Demon coil,Accel 8.8 wires,Bosch platinum plugs,timing at 10 degrees,tb bypass,relocated map sensor,shift kit,Fairbanks billet servo,pump vane kit & 2400 stall,Torque converter lockup switch,3.42 posi with welded axle tubes,Zexel Torsen HD diff.,Summit rearend girdle,solid pinion spacer,& alloy axles.Boxed panhard bar,lakewood lca's & edelbrock strut tower brace,Jeg's torque arm,Jegs welded in subframe connecters.Performance friction pads,turbo slotted front rotors,stainless braid brake lines.Roh ZT 17x8.5 front wheels with 255/40ZR/17 tires. 17x9.5 rear wheels with 275/40ZR/17's on the street.Hoosier 26x9.5 slicks on the strip.

 

Wait a second Glenn... I thought GM switched from the 7.5" 10-bolt to the 7.625" 10-bolt in 1985 or so. The 28 spline axles didnt come out until 1989 or 1990.

A 1991 should definitely have 28 spline axles.

 

Kevin, I was under the impression the 7 5/8" ring gear was the replacement for the 9 bolt Australian. And due to problems GM had with the 7 5/8" with rear disks is why so many L98s ended up with aluminum rear drum brakes instead of disk brakes.

I got into this battle with GM in 1991 when I found out that my GTA did not have disk brakes but aluminum rear drums and this was what they ultimately told me. And due to the limied availability of the rear disk posi rear-end, these were reserved for the G92 cars.

Regardless, in 1991 all F-body cars(especially GTAs) were SUPPOSE to have 7 5/8" ring gears with 28 splines. The only differences would be posi vs open (all GTAs should have posi) and drum vs disk (which seems to depend if you have G92 or not). If I had to bet on a 1991 F-body car not having 28 splines, it would be the open rear-end ones.

But, as I said, GM works in mysterious ways and what your SUPPOSE to have and what you DO HAVE can be two entirely different things when it comes to GM.

 

I remember there being some kind of strike, or shipping problem, or other such problem that GM ran out of disc brakes to put on cars in 1991. So they put drum brakes on, like your car. My 91 was built in June of 90, and has disc brakes.

 

28spline was actually available in some 88 models. (late 88).

I had 28spline 3:42s before I broke them in half. So I went searching. I found a stock rear from an 88 formula . Pulled the axles and what do you know, 28splines. As soon as the 26spline 3:73s I have now go, the original 3:42 posi (28spline) is going back in.
In case anyone is wondering, I bought them from tommygun006@aol.com

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

Paxton SN92 polished kit, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL (5200rpm limit),Holley 9mm wires,Ac delco R43ts plugs,stock chip,Ford SVO 24# injectors,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened 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 March 14, 2001).]