Gears
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Teching In
Joined: Sep 2023
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From: North Carolina
Gears Hi hope all is well. I have a 2000 trans am ws6 with stock heads, magic stick 4 ,and 4000 stall, 4l65e transmission. My question is wich gear should I run 390,or 373 not much experience with 4l65e trans I grew up with 350 turbo, and 400 trans. Thanks alot fellas
Joined: Nov 2001
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From: Schiller Park, ILL Member: #317
As you have a WS6, assuming it was originally a 4L60E (none of them came with a 4L65E, so the trans must've been swapped at some point) car then it would have come with 3.23s stock. With a 4000 stall speed already in place there is almost no performance advantage to a 3.73 swap, so you'd have to go numerically higher (like 4.10+) to see any real gains. The only advantage to a 3.73 would be to slightly "tighten" the feel of the converter at part throttle (if that's your reason for swapping). If you want significant performance gains, then 3.73 will be a waste of effort/money given your current setup.
Joined: Nov 2001
Posts: 34,632
Likes: 2,558
From: Schiller Park, ILL Member: #317
I would probably just go to a 4.10 if you're not worried about highway driving. Anything less might be disappointing (in terms of additional gains) given the stall speed you already have.
Thread Starter
Teching In
Joined: Sep 2023
Posts: 5
Likes: 0
From: North Carolina
Trans As you have a WS6, assuming it was originally a 4L60E (none of them came with a 4L65E, so the trans must've been swapped at some point) car then it would have come with 3.23s stock. With a 4000 stall speed already in place there is almost no performance advantage to a 3.73 swap, so you'd have to go numerically higher (like 4.10+) to see any real gains. The only advantage to a 3.73 would be to slightly "tighten" the feel of the converter at part throttle (if that's your reason for swapping). If you want significant performance gains, then 3.73 will be a waste of effort/money given your current setup.
