Transmission Support Crossmember Replacement (2WD 2500 Series)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Transmission Crossmember, Crossmember Bolts & Nuts

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle . Support the transmission with a transmission jack.
1	Transmission Mount to Crossmember Nut (Qty: 2) CAUTION: Refer to Fastener Caution . Tighten 50 N.m (37 lb ft)
2	Transmission Crossmember Nut (Qty: 4) Tighten 97 N.m (70 lb ft)
3	Transmission Crossmember Bolt (Qty: 4) Procedure Remove all traces of the original adhesive patch. Clean the threads of the bolt with denatured alcohol or equivalent and allow to dry. Apply threadlocker GM P/N 12345493 (Canadian P/N 10953488).
4	Transmission Crossmember