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04-18-2011, 04:52 PM #1
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??
ThanksBill M. Blown 2003 Tahoe Z71
04-18-2011, 05:49 PM #2
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
Tom woods custom dual cv rear driveshaft
K&N AIRAID system
Hypertech power programmer
And much more...........
04-18-2011, 06:16 PM #3
Yes the trans bolts are only 18ft lbs. because of the aluminum housing. Just put some blue lock-tite on the threads.
04-18-2011, 06:54 PM #4
i use german spec......goodentight03 Silverado 1500
2 Blaupunkt 10" vW1000 subs in Subthump box
ProComp Level Lift & 3" rear blocks
04-18-2011, 07:28 PM #5
Be careful,may be goodenstripped.LOL.
04-19-2011, 12:41 AM #6
1988 Chevy C-3500 2wd (no pic)
- Join Date
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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
04-19-2011, 03:51 AM #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.
04-19-2011, 11:06 AM #8
I especially liked the German Spec and the reply. LOL!
BTW, Bolts are measured at the shoulder or threaded portion, not the head.Bill M. Blown 2003 Tahoe Z71
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