10 bolt to 9 bolt/10 bolt noises

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Sep 12, 2005 | 09:16 PM

maroguy1

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Joined: Aug 2003

Posts: 186

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From: West Allis, WI

Car: 85 iroc & 81 sc

Engine: 357 tpi 350 4bbl

Transmission: 700r4/ richmond 4speed

Axle/Gears: 9 bolt 3.45/3.42 8.5"

10 bolt to 9 bolt/10 bolt noises

Question for everyone. 85 Iroc and the 7.5 rear end is making a houling noise when I let off the gas at highway speeds.
So I was thinking of replacing it with a 9 bolt but want to keep my disk brakes. If i can find one without disks and I just unbolt them off the 7.5 and use them on the 9 bolt?? Or if you have any idea what is causing the houling noise let me know also. I know it is a 3.42 posi. Thanks

Sep 13, 2005 | 06:28 AM

JamesC

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Joined: Aug 1999

Posts: 19,282

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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

I'm a bit confused about your question. Ten-bolt and nine-bolt rear discs are swapable, but you'll need the correct backing plates. Check the following link some some info that may help:

https://www.thirdgen.org/techbb2/sho...hreadid=246768

JamesC

Mar 4, 2019 | 03:23 PM

Fullmonte77

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Joined: Nov 2018

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From: Kylertown,PA

Car: 85 Berlinetta

Engine: 350

Transmission: T5

Axle/Gears: 10 bolt 3.42 with Torsen posi

Re: 10 bolt to 9 bolt/10 bolt noises

Didn't mean to reply to this post. Have no idea how I did.

Last edited by Fullmonte77; Mar 4, 2019 at 03:28 PM.

Mar 4, 2019 | 04:56 PM

big gear head

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Re: 10 bolt to 9 bolt/10 bolt noises

Check the pinion nut to see if it's tight. It's a common problem for the pinion nut to back off and cause the noise that you are hearing. This is an easy thing to check. If the nut is tight then you likely have a pinion bearing problem.