Question about 1989 GMC Sierra
My rear transfer case seal is going now my truck clunks when I put it in reverse could this be why
No. The transfer case takes Dexron/Mercon 3. What was installed instead, for fluid? If motor oil or gear oil was used instead. That would not cause a clunk. It would cause a loss of fuel economy. When vehicles get old and the mileage ads up. Parts loosen up and/or wear out. Clunking in the drive train could be related to the transfer case but could also be related to the drive shaft or the rear drive axle. Worn or bad splines, U-joints (rusted, loose, or seizing), worn ring and pinion is possibe too. If I can be more help just let me know. The more information and details that you can give, the better. Thank you.
Posted on Feb 28, 2014
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Posted on Jan 02, 2017
SOURCE: when putting truck in reverse
double check u-joints before suspecting internal problem with transfeer case. Coupling between transmission and transfeer case could be worn, as well as rear slip joint on tail shaft. If not rebuilding the transfeer case yourself, get plenty of refferences before hiring some one to overhall transfercase. InMrFixIt
Posted on May 19, 2011
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