Muffled Thud sound???

[lowdek]

Hey there, I've had a thud sound coming from the rear of my XJ anytime i back up, it thuds maybe once or twice?

i thought it was my suspension,

I got a 3" lift last week and i still hear it when reversing

any ideas?


Thanks

Al

 

[Talyn]

Only when reversing?

 

[old_man]

Retorque your ubolts on the rear axle.

 

[lowdek]

sometimes when moving forward the first 5 ft or so after a complete stop, it's quite odd, i though for sure the new suspension would have fixed it.

 

[Talyn]

Do you have a SYE? If so, grease the slip shaft on the rear drive shaft.. might as well do the front too. If not, grease the slip yoke on the transfer case. 90% sure that is your sound. Mine did it on a complete stop as well when you accelerate away from a stop.

 

[XJLI]

u-joints, driveshaft, slop in the gears, u bolts, worn bushings...

could be a bunch of things.

 

[GrimmJeeper]

see if you can put it in reverse with your foot on the brake, then pop off the brake and hit it again. if it thuds and you can make it do that over and over before it starts to move check your trans mount. if the rubber tears it lets the trans move up and down.

 

[lowdek]

I'M going to tighten the bolts on my xj at the 500 km mark just as the 3" lift instructions state should be about a week or so longer, at this point i'll go with some of your suggestions and post what worked, thanks for all your help so far

Al

 

[What Rd]

Do you have an SYE? If not. it might be that your yoke is pulled out just far enough that the shorter engagement has left you some slop.

 

[Swamprat]

your trunk monkey is pissed off

 

[Talyn]

Trunk monkey... lol... but seriously... welcome to 5 years ago

 

[95REDXJ]

check your brakes... they might be resetting becasue the rear pads or your drum are just to old.

 

[seanyb505]

check your brakes... they might be resetting becasue the rear pads or your drum are just to old.

....brake monkey then?

I would retighten everything, then rock the thing back and forth real hard from outside while parked and see if you can replicate the sound. Maybe jack it up and down to simulate weight transfer.

 

[lefty84]

I know this sounds dumb but I had the same problem only it was after putting my lift on. Turned out to be my ratchet and extension in my tool box flopping around. I felt pretty silly after figuring that out.