I have a guy telling me he has 9bolt 3.45's that came stock on his car and it was an 88 GTA. Is this possible?

Clint

 

Possible, yes.

I just put a 9 bolt (that is 9 bolts in the diff cover not ring gear bolts) 3.45 posi axle with disc brakes, on my '82 Firebird, that supposedly came from an '87 IROC. Trust me this was a chore since GM changed from Standard fittings to Metric fittings on the brake lines sometime between these years, but it can be done!

I thought the 3.45 gears were aftermarket though. I couldn't find anything about them in stock listings for any GM F-bodies in '87 and they looked brand new when I cracked the cover to check out the internals.

 

As far as I know, 3.45 9-bolt rear ends only came on 305 5-speed cars. 350 Automatic cars got the 2.77 or 3.27 9-bolts for years 87-89.


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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=-

 

the guy selling them to me says they have 138k miles on them but they were still lubed well and looked good. Should I trust them with that many miles?

 

How much is he selling them for?

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1989 Irocz
350 T-5

 

$275 for the 3.45's and the posi carier

 

Is that a good price? I have an entire 9 bolt rearend with 3.45's in them that I might be interested in selling. I have no ideal what it is worth. It has the disc brake brackets and everything.



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1989 Irocz
350 T-5

 

you are from Waco, Texas? if so, that is only a 3 hour drive from where I live. How much miles/ wear do your gears have on them? How well does the posi carrier work? I think $275 is a good price for them if they had less miles b/c 138k makes me a little worried about the shape they are in and how much longer they will last. I am not a gear expert but that is my opinion.

Clint

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89' 5.7L TPI Auto IROC American Racing Torque-thrust 2 rims ,Ported Plenum,Accel/Lingenfelter Runners,
Flowmaster, high-flow converter, SLP headers, B&M console megashifter, MSD 6aL, airfoil, K&N's,Gutted airbox, Bosch Platinum +4, 8.8 wires,Accel Coil

 

The rearend has about 90,000 miles on it. I put about 10,000 miles on it and the rest was put on by a little old lady who was the only driver until I bought it from her. I dont realy know what the exact condition of it is, but it never gave me any problems. I swaped it ought for a 10 bolt so I could use 4.10 gears with my miniram. And yes I am form Waco Texas.