Knocking from the rear
#1
Knocking from the rear
Lately I've been hearing a knocking noise coming from the back of my jeep, it's usually comes on when I drive for at least 10 min. I've noticed if I throw it into neutral it goes away for a bit. I've been told it could be my rear differential or my u joints. Has anyone else had this issue?
#2
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Year: 99
Model: Cherokee
Engine: 4.0
could be a number of things.. bad u joint, exhaust hitting x member or heat shield, bar pins on shocks, tailgate hitting bumper.. it doesn't really matter for this, but in the future its kinda nice to know what you drive.. helps get responses anyways..
Last edited by VTJeep; 10-31-2013 at 04:59 PM.
#4
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Year: 1999
Model: Cherokee
Engine: 4.0 I6
Is it a repeating noise like something rotating? Over bumps? What speed? Is your jeep lifted? Need some more info. I've had a few problems somewhat related to this but all different problems
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#8
Ok so I know it isn't the exhaust, has anyone had to replace a transmission mount or know the symptoms of a bad mount? I'm almost positive it's either that or my u joints. Just trying to get some more opinions before I go spending some money..
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Year: 1999
Model: Cherokee
Engine: 4.0 I6
U joints are easy to check. Park on level ground so the parking pawl isn't holding the jeep in position. Push up and down on the drive shaft(s) and twist the driveshaft while holding the yokes one at a time and look for play. Any play is bad and can cause noise. Also check you leaf spring bushings and shackle bushings. Shock bushings can do the same as well. Twist the shocks and visually inspect them to see if they're torn or blown out. Hope that helps ya
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Year: 99
Model: Cherokee
Engine: 4.0
zfranklin beat me to it, but..
if you can move your tranny around by pushing on it then theres your answer. a bad joint make a vibration, sometimes consistently when its really bad, sometimes only at certain speeds or during takeoffs and while coasting. you can easily diagnose this while under there testing your mount. just twist/push on drive shaft. the joint should have no play in it.
if you can move your tranny around by pushing on it then theres your answer. a bad joint make a vibration, sometimes consistently when its really bad, sometimes only at certain speeds or during takeoffs and while coasting. you can easily diagnose this while under there testing your mount. just twist/push on drive shaft. the joint should have no play in it.
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