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back axle changed

This is a discussion on back axle changed within the Drivetrain forums, part of the LSx Technical Help Section category; hi every boddy i have 99 a4 z28 last week i changed the back axel cuz the old one was ...

  1. #1
    Junior Member feras's Avatar
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    RED
    1999 Z28

    back axle changed

    hi every boddy

    i have 99 a4 z28

    last week i changed the back axel cuz the old one was damage

    i bought used one

    but i think it`s for manual

    i put 97 back axel with 2.4 ratio

    i think the old one was 2.7

    so hen i drive the car the speedo meter reading is not real i am feeling it`s more than the real so i try with my friend car

    when my friend drive near my car at he is speedo meter is 100 mile
    my car speedo meter reading 115 mile ???

    another problem when i drvive full accelration in the 3rd gear the RPM goes to red area and the car is cut off

    so what happen ??

    i hope 2 understan what i say
    sorry for the language mestake

  2. #2
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    Does your car have an aluminum or steel drive shaft? Steel = 2.73 gears; Aluminum = 3.23 gear if your car has an auto tranny. All M6 (manual 6 speed) rear gears were 3.42. Since your speedometer is off by roughly 15% to 20% I'd guess that you had 2.73's and the new differential has 3.42's which is approximately a 20% difference. The speedometer can be altered to read the correct speed by reprogramming the PCM.

  3. #3
    Junior Member feras's Avatar
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    1999 Z28

    Quote Originally Posted by 67CamaroRSSS View Post
    Does your car have an aluminum or steel drive shaft? Steel = 2.73 gears; Aluminum = 3.23 gear if your car has an auto tranny. All M6 (manual 6 speed) rear gears were 3.42. Since your speedometer is off by roughly 15% to 20% I'd guess that you had 2.73's and the new differential has 3.42's which is approximately a 20% difference. The speedometer can be altered to read the correct speed by reprogramming the PCM.
    thanks my friend

    that what i thinking about the programing

    about the drive shaft it`s Iron or some thing like that doesn`t aluminum

    and rear gear i think as what u said 3.4

    so i will take thje car to garage to see what kind of programing it`s need

    thanks

  4. #4
    Senior Member 35thAnniZ28's Avatar
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