All of a sudden I'm getting a hard knocking sound/feeling when I coast or brake. It goes away under acceleration. It is directly related to the speed of the vehicle. Feels very solid, like a hammer knocking on the rear differential or transfer case. I do not have an SYE, just transfer case drop. Could this be causing it? I thought slip yoke issues were usually vibrations under acceleration but it's the only thing I can think of here.

99 XJ
4" or so lift in rear

Thanks for any advice.

 

First thing i think of, is the t-case and exhaust loose or anything?

 

Nope, went through everything and couldn't find anything loose. Checked u joints, no play in those either.

Had my diff welded last week...wondering if something could have gone wrong in there.

 

Well IDK anything about welding diffs, but i suppose that could be a factor.

 

Actually, did you go around the rear suspension and make sure everything is tight, nothing snapped off?

 

couple things i have to ask.
did you pull the drive line to inspect it?
how many miles are on the rearend after you had it welded? I always changed the fluided after 500miles incase of slag.
aslo what kinda rear end do you have?

 

Hey guys thanks for the advice. I think I may have figured it out. I'm no mechanic, but something about this doesn't look right.

 

Whoops, there's yer problem! Have fun fixing it haha

 

someone didnt do a good job welding it up sorry for the bad luck