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rear gear question

This is a discussion on rear gear question within the Drivetrain forums, part of the LSx Technical Help Section category; I currently have the 2.73 rear in mine. I want to upgrade to the 3.23. Two questions, has anyone put ...

  1. #1
    Member speedracer25f's Avatar
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    Midnight Blue
    1998 Trans Am

    rear gear question

    I currently have the 2.73 rear in mine. I want to upgrade to the 3.23. Two questions, has anyone put the 3.43 rear in thier automatic car and if so how does it drive. And once I change the rear how do I recalibrate the speedometer.

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    Simpsons Did it!! 98formy's Avatar
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    83 Z28 new project
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    To change to speedo, you need the pcm reprogrammed. I am having the same debate, I also have 2.73's and its also my DD. To me, 3.23's would be a logical choice for the way I drive, but then I drove a 3.73's it not be enough

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    Junior Member 98BlackTA's Avatar
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    Black
    98 Trans Am WS.7 A4

    I put 3.42 gears in my daily driver A4 and love it. Though it did cut down a little on gas mileage. It pretty much depends on what you want. i had 2.73 in mine and wasn't fast enough on take off for me. When i put the new gears in i can roast the tires up into 2nd gear, third if the tires are cold.
    It is What it is.
    -----------------------------------------------
    1985 Pontiac Trans am 305 TPI 3.73 gears.
    1998 Pontiac Trans am WS.7 LS1 3.42 Gears, SLP Lid

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    Quote Originally Posted by 98BlackTA View Post
    I put 3.42 gears in my daily driver A4 and love it. Though it did cut down a little on gas mileage. It pretty much depends on what you want. i had 2.73 in mine and wasn't fast enough on take off for me. When i put the new gears in i can roast the tires up into 2nd gear, third if the tires are cold.
    How much mileage did you lose? I was thinking of going the 3.42 route with my A4, but it's a DD and I drive about 300 miles a week, so mileage is a big concern.

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    There's not much difference between 3.23 and 3.42. I put a complete M6 rear in mine and a converter at the same time, mileage went down some but well worth it IMO (had GU2). If I was just doing gears I'd consider 3.73's even with today's gas prices. Remember you'll need 2 series gears if keeping the original 2.73 carrier. Another option is keep the 2.73's and get a torque converter - highway mileage will remain the same.

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    Member firemedic0135's Avatar
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    Arctic White
    2000/Trans Am

    I have 3.73 in my DD but I dont drive 300 miles a week either.
    Your rpm's at 70 will be about 2400 and will increase 400 per 10mph in OD.
    Other than that they are the chit.Absolutly a blast to drive around.
    You will burn up some street tires.
    As stated above you will need to get a 2series ring gear if you go bigger than 3.02 if memory serves me right.

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    Junior Member 98BlackTA's Avatar
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    Gas mileage wasn't hurt too bad just a little haven't actually measured it to see. Don't really care with how it drive now it was more than worth it. As far as needed a two stage gear i don't know about when i changed mine i swapped the entire rear end out of a 2001 Camaro SS M6. So i didn't just change gears i changed entire rear ends

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    Great info!

    I was wondering about the carrier, but IIRC I saw 3.xx ratio gears for 2 series carriers in Summit Racing, so that's one possibility.

    Since I don't know how to set up gears though, maybe swapping out the rear for one out of a M6 might be the way to go.

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