9 bolt axle vs 10 bolt axle (spline)

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Feb 16, 2010 | 07:12 PM

TORN

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From: Grand Rapids MI

Car: 88 IROC-Z

Engine: 6.9L TPI(FIRST) 421ci

Transmission: T56

Axle/Gears: Ford 9" Eaton truetrac 3.50

9 bolt axle vs 10 bolt axle (spline)

Are they the same? I searched and can't find info on 9 bolt axle spline's. I got a 9 bolt in my 88 iroc z. I got a 2001 10 bolt given to me out of a SS. I'm about to buy a 89 10 bolt open diff axle. (3rd gen)

Ok my question.

I know 10 bolt LS1 parts minus axle's will swap into 10 bolt 3rd gen. I know I need 28 spline axle's are my 9 bolt axle's 28 spline and will they swap into a 89 10 bolt?

Feb 16, 2010 | 07:59 PM

hellz_wings

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From: Montreal, Canada

Car: 1986 Chevrolet Camaro IROC-Z28

Engine: TPI 310ci (LB9)

Transmission: Custom Rebuilt 700R4 - 2600 Stall

Axle/Gears: 10 bolt, 3.73 Eaton Limited-Slip

Re: 9 bolt axle vs 10 bolt axle (spline)

Why don't you keep the LS1 rear end and install it? It's probably in better shape..

Feb 16, 2010 | 08:18 PM

TORN

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From: Grand Rapids MI

Car: 88 IROC-Z

Engine: 6.9L TPI(FIRST) 421ci

Transmission: T56

Axle/Gears: Ford 9" Eaton truetrac 3.50

Re: 9 bolt axle vs 10 bolt axle (spline)

I don't want my wheels to stick out. Isn't the LS1 rear like the LT1 that it's 2 inches longer? I want 3rd gen stock axle length

Feb 16, 2010 | 08:36 PM

JamesC

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From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

Re: 9 bolt axle vs 10 bolt axle (spline)

Quote:

Originally Posted by TORN

I know 10 bolt LS1 parts minus axle's will swap into 10 bolt 3rd gen. I know I need 28 spline axle's are my 9 bolt axle's 28 spline and will they swap into a 89 10 bolt?

Yes, forthgen rears are wider. Your 9-bolt has 28-spline axles. IIRC, nothing internal from the 9-bolt will swap to a 10-bolt. For example, the 9-bolt has different axle lengths from side to side.

JamesC

Last edited by JamesC; Feb 16, 2010 at 08:41 PM.

Feb 16, 2010 | 08:46 PM

TORN

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Member

iTrader: (17)

Joined: Jan 2008

Posts: 329

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From: Grand Rapids MI

Car: 88 IROC-Z

Engine: 6.9L TPI(FIRST) 421ci

Transmission: T56

Axle/Gears: Ford 9" Eaton truetrac 3.50

Re: 9 bolt axle vs 10 bolt axle (spline)

Well I may but I was reading on here that just a small number of late model 89 axle's where 28 spline (it's open diff). So I will need to see what I have and that's why I asked encase the 10 bolt I can get is 26 spline axle's.