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  1. #1
    Jr. Mechanic BillM's Avatar
    Join Date
    Sep 2010
    Fair Oaks, CA

    Default Proper Torque for auto trans crossmember to frame Bollts 03 Tahoe 4x4 5.3

    I cannot seem to find the proper torque for the 14 mm bolts on the Auto Transmission Crossmember. The 4 bolts that bolt the crossmember to the frame.
    It is for a 2003 Tahoe Z71 4x4 with the 5.3. I have set it 80 Ft/Lbs right now, but I hope that I can get the correct torque before I take it off the jack stands.
    This is where the transmission mount bolts to the transmission and then to the Crossmember in question.
    Also, is it true that the trans mount bolts are only torqued to 18 Ft/Lbs??

    Bill M. Blown 2003 Tahoe Z71

  2. #2
    Sr. Engineer IPFK83's Avatar
    Join Date
    Jan 2011
    Jacksonville, North Carolina, United States


    Im not sure but when I put mine back on I put the impact on them and called it a day haven't had any problems with it in a year. Not too sure about the trans bolts either don't have a service manual to look at.

    2006 1500 4x4 extended cab short bed
    SAS 12" suspension lift
    38x15.50 Mickey Thompson ATZ
    20x10 Mickey Thompson Classic II
    FOA custom shocks
    Dana 44HD front axle
    14 Bolt SF w/ detroit locker
    yukon 5.13 gears
    Dynatech Long tube headers
    Dynatech y pipe w/ high flow cats
    Magnaflow muffler
    Tom woods custom dual cv rear driveshaft
    K&N AIRAID system
    Hypertech power programmer
    And much more...........

  3. #3


    Yes the trans bolts are only 18ft lbs. because of the aluminum housing. Just put some blue lock-tite on the threads.

  4. #4
    Master Mechanic clgoch187's Avatar
    Join Date
    Aug 2010
    Gettysburg, Pennsylvania, United States


    i use german spec......goodentight
    03 Silverado 1500
    285/75/16 BFG's
    2 Blaupunkt 10" vW1000 subs in Subthump box
    ProComp Level Lift & 3" rear blocks

  5. #5


    Be careful,may be goodenstripped.LOL.

  6. #6
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
    Blog Entries


    Quote Originally Posted by silveradotrailblazer View Post
    Be careful,may be goodenstripped.LOL.
    Too funny, and SO TRUE !!
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  7. #7


    Is the head of the bolt 14mm, or the diameter of the threaded section?

    If the head is 14mm, 80ft/lbs is more than tight enough.
    Last edited by 2COR517; 04-19-2011 at 03:55 AM.
    When you hear hoofbeats, look for horses not zebras.

  8. #8
    Jr. Mechanic BillM's Avatar
    Join Date
    Sep 2010
    Fair Oaks, CA


    Thanks Everyone!!
    I especially liked the German Spec and the reply. LOL!
    BTW, Bolts are measured at the shoulder or threaded portion, not the head.

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