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Motive 3.90 Gears? A4

This is a discussion on Motive 3.90 Gears? A4 within the Automatic Transmission forums, part of the Drivetrain category; I'm wanting to change gears in my '99 Z28 A4 the car currently has 3.23 gears and I'm kind of ...

  1. #1
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    1999 Camaro Z28

    Motive 3.90 Gears? A4

    I'm wanting to change gears in my '99 Z28 A4 the car currently has 3.23 gears and I'm kind of wanting 4.10's but I'm worried after I install them I am going to regret it...as looking around at the ThunderRacing website tonight and saw that they have a set of 3.90's for the Camaro's?!?!? Anybody else running them and if so how do you like'em?? Should I just go with 4.10s? I had 3.73's in my old Z28 auto but would like a little quicker acceleration with out adding a stall.

    Not that it matters lol but the only mods on the car right now is SLP LM2 and K&N FIPK best time so far was 13.202 @ 105.1MPH with a 2.02 60'

  2. #2
    Member GA Country Boy's Avatar
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    Metallic Red
    2002 Corvette Coupe

    You definitely need to change your differential if you plan on doing much drag racing, BUT if it is still going to be a 'daily driver' I think you will find 4:10's are a little too low especially if you do much highway driving. At 70mph you'll be turning 2533 RPM when you're currently turning about 1995 RPM, a 3:90 would be around 2411 RPM.
    If you're going to the labor of a differential change it wont be much more to do the torque converter (labor wise), but it will make a big difference in your ET's.
    Michael
    In GA waving from '02 C5 LS1, Z51, D1SC, 60lb injectors,RPM level 5-4L60E, 3:42, Yank 3600, QA1-12 ways, MTI long headers, high flow cats, Borlas, Wilwood, 603rwhp, 542rwtq.(DynoJet 248-C) 10.89@127.57 on street tires, Race Weight 3,640 lbs

  3. #3
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    1999 Camaro Z28

    I don't do a lot of interestate driving most of the time it's just on two lane roads that i typically run about 60mph on. I've got a friend thats going to come over and install the gears for me he works at a Chevy dealer here in town...So if he was to come over say like on a Wednesday night and I take it to the drag strip Friday night with out tunning the computer for the gears is the car going to shift right?

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