Driveline - Vibration Cross Member Cracks

90ford36
^ VIBRATION - DRIVELINE - VEHICLES WITH C6 TRANSMISSION

^ DRIVELINE - VIBRATION - VEHICLES WITH C6 TRANSMISSION
Article No. 90-23-17
LIGHT TRUCK: 1987-88 E-350


ISSUE: A driveline vibration may be caused by a crack in the crossmember between the transmission mounting bolts. This may occur on high GVW applications and trucks making multiple stops and starts.

ACTION: Install a new # 2 transmission cross member if any cracks are found during the inspection. Refer to the following procedure for service details. If no cracks are found, refer to the NVH diagnostics in the 1987-88 Light Truck Shop Manual, Volume A, Section 18-01 for corrective action.

Figure 1:

1. Remove and throw away the cracked transmission cross member. Refer to the 1987-88 Light Truck Shop Manual, Volume A, Section 17-01 for removal procedure.

2. Inspect the transmission insulator for damage.

a. If any damage is detected, replace the transmission insulator. Clean the threads with Ford Spot & Stain Remover (B7A-19521-AA).

b. If the transmission insulator is not damaged, clean the bolt threads with a wire brush and Ford Spot & Stain Remover (B7A-19521-AA).

3. Replace the insulator nuts and washers with new ones (N621945-S2).

4. Throw away the cross member to frame bolts and nuts. Replace them with new ones.

5. Apply Threadlocker 262 to all fasteners (Cross member-to-frame and cross member-to-insulator nut). Be sure that all fastener surfaces are cleaned with Ford Spot & Stain Remover (B7A-19521-AA).
6. Loosely install the new # 2 transmission cross member (E8UZ-6A023-A) to the frame side rails.

Figure 2:

7. Loosely install a fabricated reinforcement strap under the cross member.

a. Refer to Figure 2 for strap specifications and dimensions

b. Start nuts and run up to the point where they will hold the reinforcement strap in place.

8. Tighten the cross member-to-frame bolts and nuts to 65-70 lb.ft. (88-95 N-m).

9. Tighten the transmission insulator nuts to 75-80 lb.ft. (102-108 N-m).



OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage
OPERATION DESCRIPTION TIME
902317A Install Cross member 1.1 Hr.
DEALER CODING
BASIC PART NO. CONDITION CODE
6A023 01
OASIS CODES: 703000, 305000, 504000