For a couple of weeks now I have an issue I can't diagnose. I feel and hear a thump when I let off the brake (engine running, trans in drive). I am driving and hit a red light or stop sign and come to a complete stop and then let off the brake and the thump happens right afterwards before accelerating. If I stay at a slow rolling speed it does not happen and if I come to a complete stop extremely slow it won't happen. I thought it might be a driveshaft yoke but they seem tight. It's a 03 2500HD CC/SB LB7 Auto 170K with original brakes (I do check them often, do they ever wear out?).
Allison 6sp: Thump when letting off brake
- Thread starter dwf
- Start date
How do the u-joints feel? My last truck did this, I tore in and found a grease seal on 1 cap was leaking and the joint was starting to seize up causing the same symptom.