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Thread: trans cooling lines

  1. #1
    Join Date
    Feb 2003
    Location
    Grand Rapids MN 55744
    Posts
    1,648

    Default trans cooling lines

    Howdy
    On the 1986 k5 blazer radiator, what transmission(turbo 400) line is input?
    Transmission lines are on the driverside.
    I always thought the top was input, bottom out?
    I am adding a trans cooler.
    Thanks!
    1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
    1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
    2001 Chinook RV, V10 gas
    1974 John Deere 1530 diesel tractor
    1993 John Deere 455 Diesel lawn mower
    1967 GTO, 1989 Honda Transalp
    2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
    1998 6.5 suburban, stock, daughter's
    1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's

    1984 6.2 ATS turbo 3500, SCDWLB - Son's
    3 kids, 1 wife, 1 dog
    Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!

  2. #2
    Join Date
    Apr 2001
    Location
    Newberg Oregon
    Posts
    12,282

    Default

    Trace the lines back to the tranny

    On the 350/400/700 the top fitting (at the tranny) is the return line.

    Normally the fluid feeds from the tranny to the top fitting on the radiator then returns from the bottom one.

    Be sure to get your air to oil cooler in the line that's returning to the tranny to give the best added cooling.

    If you have any doubt of flow direction, unhook the lines at the radiator, slip some fuel hose over them and stuff the ends in can, have a helper fire the rig for a second.

    ***** Safety*****
    Place tranny in N for best oil flow and set park brake/block wheels before starting engine

    You will quickly know which line delivers the oil.

    Good luck

    Missy
    (1) 1995 Suburban 2500 4x4
    (1) 1997 Astro
    (1) 2005 Suburban (Papa Smurf)
    THIS IS BOW TIE COUNTRY

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