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  1. #1
    Junior Member
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    May 2008
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    Madison, MS
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    14

    red/beige
    1955 Chevy convertible

    Thumbs down Rear end gearing?

    LS1 from 2002 Firebird with 4L60E installed in 55 Chevy. Does anyone know what gear ratio the original machine had in it? Any suggestions as to what ratio would be good for a cruising only car(the car will be used for shows/cruising the coast etc) and want to get the computer programmed for the new gears is necessary. The current rear end is a stock 55 with 355 ratio.

  2. #2
    Member jcws6's Avatar
    Join Date
    Sep 2006
    Location
    Western Pennsylvania
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    151

    Black
    2002 Trans Am WS6

    The 02 Firebird with an auto most likely had a 2.73 ratio (unless it was a Trans Am WS6, which had a 3.23).

  3. #3
    Junior Member
    Join Date
    May 2008
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    red/beige
    1955 Chevy convertible

    Rear end gearing?

    Thanks for the info. It was out of a ram air firebird and is the 325 HP version with the 4L60E and computer attached.

  4. #4
    Riding in an Engine HMFDZ28's Avatar
    Join Date
    Oct 2006
    Location
    New York
    Age
    41
    Posts
    46

    Sebring Silver
    02 Z28

    most likely a 3.23 gear set

  5. #5
    Junior Member
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    May 2008
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    Madison, MS
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    red/beige
    1955 Chevy convertible

    Rear end gearing?

    Think the 355 gears would be close enough or should I change to say 336? The 336 is rather common to the 55 chunk. I am putting a posi unit in it anyway.

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