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Installing trans cooler

Discussion in 'Chevy Trucks' started by chesterlawn, Nov 2, 2007.

  1. chesterlawn

    chesterlawn Member
    Messages: 87

    I have a 1999 z71 with a 5.3 engine in it. Does anybody know which is the return line to the transmission? Is it the top or bottom one on the radiator? thanks
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    The upper port AT THE TRANS is the return. If you follow it up to the rad, it should be the upper line also, but double check it at the trans to be sure...as they were plummed both ways at the rad..