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Unread 04-05-2010, 12:06 PM   #1
arnelio2
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Join Date: Mar 2010
Location: vermont
Posts: 7
91 yj clunking noise at take off

I have a 91 yj and there has been a clunking noise when I start off in first. After the initial noise, I can put the clutch in and release it, and there is no noise. To hear the clunk again, I have to roll back or put it into reverse, and then back into first. Any Ideas? It sounds like it is coming from the tc or tranny. Not sure though. Just wondering if this puts up some red flags for anyone... would save me alot of time. Thanks much

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Unread 04-05-2010, 12:17 PM   #2
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
Posts: 2,554
Inspect the motor and tranny mount condition. First guess is a bad tranny mount along with the insulator stud (torque arm for the tranny mount). Usually if one is bad, then all are suspect. Meaning, if the tranny mount components are worn out, then likely the motor mounts are shot as well. Best to replace all as a set. If this is the case, replace the motor mounts first while leaving the tranny mount bolts to the skid loose. Then replace the tranny mounts and tighten once the skid is in place. This could also be caused by bad u-joints, track arm bushings, etc... Inspect all of the above. But with your description, the tranny mounts are my best guess.
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Unread 04-05-2010, 08:24 PM   #3
eaglesfan8105
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1993 YJ Wrangler 
 
Join Date: Apr 2008
Location: pittston
Posts: 9
i had the same problem.. tranny mount was shot so when taking off the tranny was twisting over and causing the drive shaft to be at an angle and the u-joint was hitting off the shield above the muffler
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Unread 04-05-2010, 11:35 PM   #4
MJMPC
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1991 YJ Wrangler 
 
Join Date: Nov 2008
Location: Elizabethtown, Ky.
Posts: 3,070
Check your u-joints in the rear driveshaft.
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