Well i just did my swap from a 89 2.77, to a 87 3.27. As i took the 3.27 apart i learned alot. Here are some of the numbers i found. the axles are 28 spline.It is has full length 1 5/16 inch shaft to where the splines enter the posi where it tapers to 1 1/8 inch. The 10 bolt , (which i had one next to it) has 1 1/8 inch shaft tapered to 1 1/16 in the posi. HMMMMMMMM. No C-Clips, tapered bearings, and a cone (rebuildable) posi, why would you not want to keep this rear. I agree 2.77 bite, but with good tires i could have been looking at 14.1 at 98.8 with that those gears. Now i have my $200.00 3.27 and i couldn't be happier. Well to each Their own. The Shaggy Iroc

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'89 SHAGGY IROC
L98, W/C T5, all free stuff,T.E.S.,HOOKER CAT BACK,KYB,ACCEL8.8,JET fan sw. etc. 14.4@ 98.8 MPH w/t-5, can't wait for to install my 3.27 B/W.
so much to do , so little money

 

Yep, I found the same things when I did my 91 10-bolt to 89 9-bolt swap. I hope you put the 89's brakes on the 87 rear end. Or did you put the 87's internals into the 89 rear end?

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

well funny enough GM used the 9 bolt as the heavy duty option on 3rd gens ammazing thing is everyone wants to make their cars stronger BUT puts the ****ty 10 bolt in !!!! i dont understand
btw parts and stuff should be available real soon in usa lots of different ratios

 

yep, i kept the brakes, 11.65" PBR. I just yanked the axles out and swapped backing plates. Then threw my calipers on. I did the whole swap in 5 hrs, but then i can pull the rear in 30 minutes. Wow, gotta say I am shooting for 13.99 at the next TNT, with my drag tires of course

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'89 SHAGGY IROC
L98, W/C T5, all free stuff,T.E.S.,HOOKER CAT BACK,KYB,ACCEL8.8,JET fan sw. etc. 14.4@ 98.8 MPH w/t-5, can't wait for to install my 3.27 B/W.
so much to do , so little money

 

While the B/W setup is stronger it is also much more expensive to fix and is very finicky.

I will gladly trade my B/W setup (3.27 with new calipers, cables, hoses, and rotors) to anyone with a posi drum setup.

 

Sleeper, I wish you lived closer because I have a 92 10-bolt 28-spline axle 3.23 drum brake rear end for sale.

 

Question for ya, my understanding is that the cone posi is NOT rebuildable, and that the whole carrier needs to be replaced as a unit.

Do you have access to parts for a rebuild? Please share.

 

look in the archives, and/or tech. There is info on "how to shim the 9 bolt" in there. A guy from HUNTER MOTORPORTS up in canada did a instructional on it . If you can't find let me know, i have it printed , and can send a copy. THE SHAGGY IROC

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'89 SHAGGY IROC
L98, W/C T5, all free stuff,T.E.S.,HOOKER CAT BACK,KYB,ACCEL8.8,JET fan sw. etc. 14.4@ 98.8 MPH w/t-5, installed my 3.27 B/W, SHOOTING FOR 13.99, saturday.
so much to do , so little money

[This message has been edited by irocnroll89 (edited August 02, 2001).]

 

Thanks, I have that info, but you realize that's just doctoring it up and once the cone is gone, you'll need a new carrier?

You had my hopes up for a minute

 

Well, you can shim the cone BUT if the cone s have eaten into the case - it's time for a whole new carrier.
GM isn't carrying carrier halves or cones anymore (if they ever did I dunno) - just the whole carrier. $1033 list. $619 on GM parts direct.

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'89 Formula - Thunderchicken - 355 Vette L98/T-56/3.45 9-bolt/black/t-tops - the fun car!
'90 GTA - The GTA - 5.0 LB9/TH700/3.27 9-bolt/black/t-tops/tan leather - the cruiser.

 

i have a 88 gta with the 9 bolt i am looking for a 3.70 or 3.73 r&p dose anyone know where i can find one or the other any info. would help very much because i have been looking for a lon time

 

Try this: http://www.drivetrainspecialists.com...=29&cat=GM+8.2