Transmission Support Crossmember Replacement (2WD 2500 series)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Transmission Crossmember, Bolts & Nuts

Courtesy of GENERAL MOTORS CORP.

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) NOTE: Refer to Fastener Notice . Tighten: 40 N.m (30 lb ft)
2	Transmission Crossmember Nut (Qty: 4) Tighten: 97 N.m (70 lb ft)
3	Transmission Crossmember Bolt (Qty: 4) Tip: 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