[CaptTJ]

Hi,

99 TJ Wrangler... 3 Speed Auto.... 4 lt 6 cyliner... when i put in gear (D) thrz a knock or hit.. the jeep literally moves up n down when this happens..... this also happens when i put it in reverse.... if i park it on a slope and try to engage the gears the when i pass the reverse n put it D, the reverse makes such a knock tht i worry if somethin is gona break.... thrz a shop i go to... (rather went to, crooks) says thts a common problem in a TJ... it happens cause because it a 3 speed.... so this is whr i stand... any thoughts guys?

[26679cj5]

did you check your ujoints on the driveshafts just to make sure they're ok?

[CaptTJ]

I Checked my control arm bushes and they all look fine to me. I did try to move them sidewards, nothin happened. Do i have to get the wheels of the ground be4 i try to chk for control arm bushes? Also, this morning when i check my drive shaft for play i found that it really really turn a lot. Lot of play. Could this be the reason for the clunk of knock when i engage the gears?

[relgnarw]

Originally Posted by CaptTJ

Also, this morning when i check my drive shaft for play i found that it really really turn a lot. Lot of play. Could this be the reason for the clunk of knock when i engage the gears?

Yes

[CaptTJ]

N whts the best fix?

[relgnarw]

Just replace the rear driveshaft U-joints, and you should be good to go.

[geiman]

I've had a similar problem when my transmission mount was bad. When I would initially put the tranny under load (taking off from a dead stop) it would make a rapid knocking sound that increased depending on how hard I mashed the pedal. The transmission mount can deteriorate over time and separate into two pieces. May not be your problem but it's something to check out.

[LJameson]

I agree with geiman, check your tranny mount too.