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what transmission do i have?

Discussion in 'GM Powertrain' started by drussel1, Jan 16, 2009.

  1. drussel1

    drussel1 New Member

    I have a 1991 suburban 2500 with 8 lug axles. I am curious to know what transmission i have in the truck. Can someone help me?

    Thanks
  2. bzboardco

    bzboardco Rockstar 100 Posts

    I believe it is a
    4L80E
  3. Crawdaddy

    Crawdaddy Thread Killer Extraordinaire Staff Member 5+ Years 1000 Posts Platinum Contributor

  4. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    That year I would have thought a 700r4 or turbo 400, i didnt think the 4L trannies didnt get into the suburbans until the new body style in 92
  5. Crawdaddy

    Crawdaddy Thread Killer Extraordinaire Staff Member 5+ Years 1000 Posts Platinum Contributor

    I didn't even catch that it was a 91 Subruban. Yeah, it would probably have a turbo 400 or something as the electronically controlled transmissions wern't introduced in Suburbans until 92.
  6. 2loud

    2loud Rockstar 100 Posts

    My quest goes to th 400 but its hard to tell on an old truck .. i could have been swapt ,
  7. JMoney02

    JMoney02 Epic Member 5+ Years 500 Posts

    TH400 either short shaft or long shaft(2wd/4wd). You guys are right the ECT were not until 92....

    Jeff

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