Noobie question about rear end
Thread Starter
Member
iTrader: (2)
Joined: Oct 2005
Posts: 153
Likes: 0
From: York,PA
Car: 91 Camaro RS Convertible
Noobie question about rear end
I have an 88 firebird formula. It has rear disc brakes. How can I tell first what rear end I have. I read that 9 bolt is a borg warner. I have a nine bolt. How can I tell what gears it has and if it is posi or not? I read to take the cover off and look but what do I look for?
Joined: Aug 1999
Posts: 19,282
Likes: 103
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
As xpndbl3 mentions, a number should be stamped on both the ring and pinion to provide the gear ratio:
41 : 15 = 2.73
40 : 13 = 3.08
42 : 13 = 3.23
41 : 12 = 3.42
41 : 11 = 3.73
If the ratio is different than your current rear end, you may need to swap the drive or driven (or both) in the tranny to get an exact speedo reading.
Posi or not?
https://www.thirdgen.org/forums/tran...what-axle.html
JamesC
41 : 15 = 2.73
40 : 13 = 3.08
42 : 13 = 3.23
41 : 12 = 3.42
41 : 11 = 3.73
If the ratio is different than your current rear end, you may need to swap the drive or driven (or both) in the tranny to get an exact speedo reading.
Posi or not?
https://www.thirdgen.org/forums/tran...what-axle.html
JamesC
Last edited by JamesC; Oct 13, 2006 at 05:51 AM.
Thread
Thread Starter
Forum
Replies
Last Post
hectre13
Engine/Drivetrain/Suspension Parts for Sale
2
Dec 11, 2023 08:14 AM
hectre13
Engine/Drivetrain/Suspension Parts for Sale
7
Aug 26, 2015 08:17 AM
AkDrifted
Engine/Drivetrain/Suspension Parts for Sale
6
Aug 17, 2015 07:45 PM