1985 Firebird--Rear End Swap?
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 35
Likes: 0
From: Virginia
Car: 1985 Pontiac Firebird
Engine: 307 Olds
Transmission: 200r4
Axle/Gears: soon to be 3:73 posi
1985 Firebird--Rear End Swap?
Hi,
Not sure about the factory gears that came with the v6 model, but I think they are 2.77's. Wanting to know what would be the best way to upgrade the rear end? I have 700R4 -Metric tranny with OD. Is it best to replace the existing rear end or can you put in gears without replacing the entire rear end? Can't find any posi units complete on ebay or anywhere near me in Virginia.
Thanks for any help.
Not sure about the factory gears that came with the v6 model, but I think they are 2.77's. Wanting to know what would be the best way to upgrade the rear end? I have 700R4 -Metric tranny with OD. Is it best to replace the existing rear end or can you put in gears without replacing the entire rear end? Can't find any posi units complete on ebay or anywhere near me in Virginia.
Thanks for any help.
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 1985 Firebird--Rear End Swap?
The 1985 2.8 V6 came with 3.42 gears. Most likely not post but it could be as it was an add on not a engine related thing. I would stick to the 3.42 ratio with a 700r4 and add a posi unit.
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