Rattling noise while coasting - JeepForum.com

 
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post #1 of 6 Old 01-07-2014, 12:00 AM Thread Starter
thriftyninja
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1975 CJ5 
 
Join Date: May 2012
Location: bradenton
Posts: 35
Am finally at the stage where I can road test my two year project. I have had tranny rebuilt, transfer case rebuilt, u joints are new, engine swap, new clutch and pilot bushing. Drives and shifts great. Problem is when i reach about 25 miles per hour and let off to coast or push in clutch i hear a rattling noise. It almost sounds like a gear is rattling around near the tranny but i have pulled it off three times along with the t-case to check it out. Any thoughts on what may cause such a thing?

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post #2 of 6 Old 01-07-2014, 12:21 AM
jnicewan
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1995 ZJ 
 
Join Date: Dec 2010
Location: Norman
Posts: 2,348
Some may consider it normal but if its what I think it is then its probably in the output shaft section of the t-case. I have heard numerous 20's and 300's that made the noise you describe. I only assume it was the output section because after installing a HD rear output on one the noise went away. There are shims that setup preload on those bearings. Also make sure its not something stupid like the shifter linkage or a worn u-joint or slip yoke. Im sure you checked stuffed like exhaust/hangers and other things underneath too.
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post #3 of 6 Old 01-07-2014, 05:30 PM Thread Starter
thriftyninja
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1975 CJ5 
 
Join Date: May 2012
Location: bradenton
Posts: 35
Apparently I didn't have all the transmission mounts that were supposed to be on the tranny. I had the long rubber piece that goes in middle of tranny but not the one close to the driver side. Hopefully it will be on the road come Thursday.
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post #4 of 6 Old 01-12-2014, 08:09 PM Thread Starter
thriftyninja
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1975 CJ5 
 
Join Date: May 2012
Location: bradenton
Posts: 35
To update... The tranny has been secured but the rattle is still in full effect. It is very noticeable when going in speeds above 30 MPH. It mainly happens when pushing in the clutch or putting the tranny in neutral. I tried going about 45mph and braking while leaving vehicle in gear until the jeep was below 15MPH and the noise did not happen. Any ideas will be appreciated. Tranny was rebuilt along with the clutch and throw out bushing was put in place of throw out bearing
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post #5 of 6 Old 01-12-2014, 08:11 PM Thread Starter
thriftyninja
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1975 CJ5 
 
Join Date: May 2012
Location: bradenton
Posts: 35
Quote:
Originally Posted by jnicewan
Some may consider it normal but if its what I think it is then its probably in the output shaft section of the t-case. I have heard numerous 20's and 300's that made the noise you describe. I only assume it was the output section because after installing a HD rear output on one the noise went away. There are shims that setup preload on those bearings. Also make sure its not something stupid like the shifter linkage or a worn u-joint or slip yoke. Im sure you checked stuffed like exhaust/hangers and other things underneath too.
I am hoping i dont have to take tranny off again...
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post #6 of 6 Old 03-22-2015, 07:14 PM
59limited
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1998 ZJ 
 
Join Date: May 2007
Location: Rochester, NY
Posts: 9
Any luck on that rumble?

I've got a CJ2a and am experiencing the same thing. Rebuilt the tranny and tcase 2 times. Rebuilt rear end and still have it. Driving me nuts for the past 4 years! Thanks
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