I have a question..

[Brfootball45]

Hey guys i have a question. I noticed today while driving my truck when im stopped at light and then go when its green like halfway through 1st i feel a slight thud coming from the rear. I do not hear anything and when i get into the higher gears i dont feel it. I came home chocked my tires then put the truck in neutral when i did that i crawled under and my rear U-joint is tight but however i have a SLIGHT movement to the right it seems in the rear yoke or possibly the rear end. What could this mean is my rearend going, or what could it be????

[melmount]

fix the U joint, then make sure the pinion bolt is not backing out. I doubt it but its happened. Check all U joint when the shaft is out. Also if its a 2 piece drive shaft the clunks often come from the splines where they meet. Grease them.

[melmount]

If its a 4wd greasethe front slip joint too.. Can be that shaft also making noise. Check carrier bearing

[Brfootball45]

yeah its a 4wd it just started doing it today but its a very slight thud real quick in first gear and thats it, it doesnt happen in any other gear. Also i dont tow or beat on the truck i only drive it 2 days a week then its stored in a heated garage... but do you guys think it could be my rearend or no?

[Hivolts]

Is your truck auto or manual? My truck was doing something very similar and ended up being the clutch slipping very slightly. Guess I found the weakest part when running extreme street

[Brfootball45]

my truck is an automatic it was rebuilt 30,000 miles ago

[Brfootball45]

bump bump bump bump

[melmount]

the rear can clunk, but that does not mean its serious. Mine clunks but its fine. when does it clunk?

[Brfootball45]

its like a thud there is no noise what so ever, its just when im from a dead stop and i go and half threw first gear(automatic) i feel it then it goes away its real quick thud though