Hi any one had this.My truck is bucking under load. after I put on a heavery camper larger tiries and air bags in the rear.It will do it in 3,4,5 gears it feels like a miss fire but boost and fuel pressure are steady.It will do it from idle to 32oo rpm.And it still does it with the juice off.Before I upgraded the power I only had a edge 65 hp chip and it ran fine with my old camper .As soon As i put on heavery camper ,air bags and larger tires .All done At the same time.The bucking started.Any info would be great.

thanks

 

Somebody else just had a similar problem in reverse. There problem turned out to be U joints and the carrier bearing mount. I'll see if I can find the thread.

 

Here you go.

https://www.dieseltruckresource.com/...t-t247527.html

 

I had the rear drive shaft rebuild new u joints ,steady bearing and slip shaft and it is still the same