1996 GM Trucks & Vans With 7.4L Engine With RPO Code L29 (GM Service Bulletin No. 67-71-59)
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 1998 GMC Savana Special, 1998 GMC Savana Camper Special, 1998 GMC Savana, 1998 Chevrolet RV Cutaway, and 1998 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Some owners may complain of a clunk on acceleration after closed throttle coast down. Drive line clunk is transmitted through vehicle with TCC applied. VCM software calibration maintains TCC application at closed throttle. TCC release is based on vehicle speed and brake switch input. If normal diagnostic procedures do not correct problem, reflash VCM with appropriate CD-ROM Disc No. 22 (16227602 through 16227605), available from manufacturer. New software calibration will allow TCC to release at closed throttle position.