Changing Final Drive ratio/ ECM tuning

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HT4100 4.1, 4.5, 4.9 Discussion, Changing Final Drive ratio/ ECM tuning in Cadillac Engine Discussion; So I want to change the final drive ratio in my 4T60-E to either 3.06:1 or 3.43:1 (haven't decided yet) ...
  1. #1
    Rodya234's Avatar
    Rodya234 is offline Cadillac Owners Connoisseur
    Automobile(s): 1998 Seville STS / 2013 Chevrolet Impala
    Join Date
    May 2008
    Chicago, IL

    Changing Final Drive ratio/ ECM tuning

    So I want to change the final drive ratio in my 4T60-E to either 3.06:1 or 3.43:1 (haven't decided yet) and I know what I need to get it done, but I wondered if the car would need ECM tuning afterward. I'm assuming the shift points on the transmission would need to be changed, but I'm not sure. Does anyone know?

    Also, where would I get ECM tuning done for this car? I know I can buy the software myself, but I don't really want to foot the bill for it at the moment.


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  3. #2
    drewsdeville is offline Cadillac Owners Master
    Automobile(s): 2011 Crown Vic LX, 2009 Chevy Malibu 2LT
    Join Date
    Oct 2004
    Oak Creek, WI

    Re: Changing Final Drive ratio/ ECM tuning

    I know there are quite a few 2240 tuners among the fiero guys. You should be able to find someone to do it at

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