Thump at complete stop, and start

I was trying to figure out how to word this and this is the best way I can describe what is happening and its driving me crazy not knowing what it is so here we go. I get a strange thump whenever i come to a complete stop and also when i accelerate from a stop. The way I would describe it is like if you were to have a 4wheeler loaded in the bed of your truck and you had about 1-2 inch gap at the front of your 4wheeler and also a similar gap at the back, then with the 4 wheeler in neutral you accelerate from a stop and naturally the thing rolls back and makes a thump noise when it hits your tailgate, then when you come to a stop the thing rolls forward and makes a thump when it hits your truck bed. That is the way this feels. What can this be? Only happens at a complete stop and at the start off. WTF?

06 DC 4X4 Offraod Sport

 

?

 

Man i don't know about axle wrap because I am not accelerating hard. It happens when I just lightly accelerate. Maybe I'm wrong but I think it may be something else. Not sure .

 

Hmmm...sounds like axle wrap to me too.

 

Ok i drove it today and after seeing the axle wrap videos and now knowing what exactly axle wrap is, I can say that it definitely is not axle wrap. I get the thump feeling when I lightly press the gas and sometimes I get it just by taking my foot off the brake and idling forward. To get the axle wrap it seems like you need to cause more pressure like when you accelerate aggressively or apply alot of torque to the wheels which I am not doing. I'm starting to think that my problem has to do with the slip yoke. What do you guys think?

 

I had a "thunk" problem with an older Toyota pickup of mine. The service tech said it was the slip yoke binding and it really did little harm. After a couple of years it finally went away.

I read in another forum that someone who had a slip-yoke binding problem was told that one solution would be to use valve grinding compound to lap the splines until they no longer stuck. However, I believe he finally obtained some special high-pressure Dupont "liquid Teflon" lube and applied it, solving his problem.

 

Try greasing your drive shaft? But it does sound like axle wrap.

 

I will try to get some grease in the first zerk near the tranny that is the only one I haven't been able to reach today. I think I need a flex hose connection for my grease gun to get to this one.

 

I had the same problem. No matter how hard or soft I got into the gas. I did the helper spring mod & problem solved! And for only $25!!!