How can I tell what rear end ratio I have?
Thread Starter
Supreme Member
Joined: Jan 2000
Posts: 1,205
Likes: 93
From: Mississauga, Ontario Canada
Car: 1987 GTA
Engine: 5.7
Transmission: T5WC
Axle/Gears: 3:27
How can I tell what rear end ratio I have?
87 GTA 5.7. I'm doing the manual swap and would like to verify what rear end is in the car. Is there a simple way to go about that via the VIN?
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iTrader: (1)
Joined: Sep 2010
Posts: 1,928
Likes: 1
From: Georgetown TX
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: How can I tell what rear end ratio I have?
100% sure is pull the cover and look at what is stamped on the ring gear. Or, count the wheel revs compared to drive shaft and divide. The VIN wouldn't tell you but the RPO code would but that assumes the original rear.
Thread Starter
Supreme Member
Joined: Jan 2000
Posts: 1,205
Likes: 93
From: Mississauga, Ontario Canada
Car: 1987 GTA
Engine: 5.7
Transmission: T5WC
Axle/Gears: 3:27
Re: How can I tell what rear end ratio I have?
I think it's a 9 bolt. Have to check when I get home. Is the RPO sticker the one inside the arm rest? I have no idea what I did with it. I know for a fact it's the factory rear end. There isn't a build sheet stuck under the rear seat is there?
Supreme Member
iTrader: (1)
Joined: Sep 2010
Posts: 1,928
Likes: 1
From: Georgetown TX
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: How can I tell what rear end ratio I have?
It is. If the tag is there and all is original for sure then you're good to go. But....
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Joined: Dec 2002
Posts: 2,535
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From: Bowdon, GA.
Car: 1988 Camaro
Engine: 355, 10.34:1, 249/252 @.050", IK200
Transmission: TH-400, 3500 stall 9.5" converter
Axle/Gears: Ford 9", detroit locker, 3.89 gears
Re: How can I tell what rear end ratio I have?
I thought the only rear end option for the 1987 L98 F body cars was the BW 9 bolt, 3.27 gear
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