Rear-end gear swap
Thread Starter
Instructor
Joined: Oct 2021
Posts: 192
Likes: 44
From: Raleigh
Rear-end gear swap
I'm planning to swap in 3.90 gears in the rear end of my 99'. Does anyone have an opinion on which supplier to use: Motive Gear, Yukon, something else? My engine puts out 409 HP at the wheels, so it's not crazy power like some of y'all have. Thanks in advance for opinions, thoughts and suggestions.
Running Guns & Moonshine
Joined: Aug 2001
Posts: 12,825
Likes: 7,389
From: CT
All I can say is that's a great combo. I used to have a 424rw / 7400 rpm LT1 in a 94 Trans Am GT with 4.10s and 335 rear tires with custom bilsteins. That car drove like a go kart. And the gearing.... Amazing with a T56. First won't really exist anymore but I loved winding that thing out. You clearly have a cam in your combo to be at 410rw so I think if you're staying NA with no plans to supercharge ever that you're on exactly the right path.
Last edited by Tusc; Today at 01:46 PM.
Race Director
Joined: Jan 2000
Posts: 10,407
Likes: 3,409
From: Central TX
C5 of Year Finalist (appearance mods) 2019
I'm planning to swap in 3.90 gears in the rear end of my 99'. Does anyone have an opinion on which supplier to use: Motive Gear, Yukon, something else? My engine puts out 409 HP at the wheels, so it's not crazy power like some of y'all have. Thanks in advance for opinions, thoughts and suggestions.
https://www.txdrivetrain.com/
Racer
Joined: Mar 2007
Posts: 271
Likes: 35
From: Central Texas
These guys are well known and highly recommended. Give them a call.
https://www.txdrivetrain.com/
https://www.txdrivetrain.com/
Upgrades
Building differentials for performance involves upgrading components to handle higher power and torque in vehicles, especially in racing applications. This process typically includes replacing factory internals with higher-quality alternatives, and often switching to limited-slip or locking differentials for better traction and power distribution. For example, some common upgrades for the Corvette include a Wavetrac posi unit, billet output stub shafts and 3.90 gear swap. Texas Drivetrain Performance excels at differential rebuilds, and we know the proper adjustments that may need to be made to gear ratios for improved acceleration or top speed. The use of high-performance lubricants and upgraded parts further enhances durability and efficiency, making these rebuilds essential for achieving superior vehicle performance and handling.VERY NICE!
Burning Brakes
Joined: Nov 2013
Posts: 1,183
Likes: 540
These guys are well known and highly recommended. Give them a call.
https://www.txdrivetrain.com/
https://www.txdrivetrain.com/
Racer
Joined: Mar 2007
Posts: 271
Likes: 35
From: Central Texas
All I can say is that's a great combo. I used to have a 424rw / 7400 rpm LT1 in a 94 Trans Am GT with 4.10s and 335 rear tires with custom bilsteins. That car drove like a go kart. And the gearing.... Amazing with a T56. First won't really exist anymore but I loved winding that thing out. You clearly have a cam in your combo to be at 410rw so I think if you're staying NA with no plans to supercharge ever that you're on exactly the right path.
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Racer
Joined: Mar 2007
Posts: 271
Likes: 35
From: Central Texas
Racer
Joined: Mar 2007
Posts: 271
Likes: 35
From: Central Texas