hello guys my truck recently started to thump at start off. like i will stop at a red light or wherever and when i go to start moving again it will thump twice toward the back end . Any thoughts?

 

Could be ur differential. Is it limited slip.....make sure u have plenty of friction modifier and have u ever changed ur differential fluid. Is it kinda like a jerk feeling?

 

yup changed the fluid. and yea ill press down on the gas and itll just thump twice and jerk a little bit but if i ease on the gas really slowly it wont do it

 

mine did the same thing and I had the clutch pack replaced in the rear end and viola..problem solved

 

I think there is a TSB about drive train slip-bump - Lube the slip yoke at the transfer case.

 

any estimates on repairing cost???

 

What's it cost IF it's only the clutch pack???

 

yea

 

05 5.4 37,000 miles. I too get a thump when dead stopped and right before shifting into second. Going up hill is worse. Taking it in on Wednesday to Ford. I'll mention the slip yoke and differentials to them. Yikes.

 

I took it to the dealer and it was about $800...