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  1. #1
    Sr. Apprentice
    Join Date
    Jan 2011
    Location
    Coeur d'Alene, Idaho, United States
    Posts
    45

    Default What Tranny do I have

    Ok, I've been busy reading all of the forums that I can but I keep coming up with a problem with deciding what tranny I have. According to the RPO codes in the glove box per the Compnine.com website I have a 700R4/4L60 but in reading the forums these two seem to be different trannys. So do I have a 700R4 or do I have a 4L60? Or is the 4L60 just a version of the 700R4? Sorry if this is a dumb question but frankly the only trannys that I am familiar with are the old 350 and 400 turbos.
    1991 Chevy Suburban, 190K, 1500 1/2 ton, 5.7L, 3:42 gears, 4X4, stock tire size, stock suspension set up.

  2. #2

    Default

    700F4 and 4L60 are the same trans.
    When you hear hoofbeats, look for horses not zebras.

  3. #3

    Default

    The 700R4 and 4L60 are the exact same name for the transmission. In 1988, the C/K pickup trucks changed their bodystyle to the new "90s bodystyle". When the bodystyle changed, the 4L60E transmission was introduced. It was the same thing as the 700R4, except that it was electronically controlled by a computer. To keep up with their new naming scheme for the R/V Suburbans, which kept the old 80s bodystyle until 1991, they changed the name of the 700R4 to 4L60 (note the lack of the "E"). Same transmission, new name. The 700R4 is controlled through a throttle valve cable (tv cable). The only electronics in it is for torque converter lockup and reverse light switch.

    In general, it is much safer to refer to your transmission as a 700R4 rather than as a 4L60, though 4L60 is the proper name for 1991. When people hear 4L60, they instantly think of the 4L60E, and common changes made for the 4L60E, like shift kits, are drastically different than the 700R4s. The 4L60E shift kit is a computer reprogramming, which obviously won't work for a transmission that has NO computer control in it.

    So yes, you do have a 700R4... Clear as mud?
    Last edited by Crawdaddy; 03-04-2011 at 11:09 AM.
    Christopher

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half



    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  4. #4

    Default

    You have a 700R4.
    Jess

    1991 Suburban


  5. #5
    Sr. Apprentice
    Join Date
    Jan 2011
    Location
    Coeur d'Alene, Idaho, United States
    Posts
    45

    Default

    Actually that does help. I completely missed the E part of the 4L60 but I guess I do remember reading something about the electronic shifting. Anyway thanks for the info. I just have fallen in love with this beast and it's like every new hobby, you want to know everything about it.

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