Question about 1989 GMC Sierra

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Will not having proper lube in rear transfer case make truck clunk

My rear transfer case seal is going now my truck clunks when I put it in reverse could this be why

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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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6ya6ya
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Posted on Jan 02, 2017

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  • 306 Answers

SOURCE: Just had motor & transfer case cover replaced

sounds like the universal joints on the rear drive shaft

Posted on Mar 22, 2010

emissionwiz
  • 85111 Answers

SOURCE: Transfer case on 2005 gmc

more than likely the transfer case chain is loose, have the slack checked, there is a gage they use to check this

Posted on Sep 16, 2010

InMrFixIt
  • 121 Answers

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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Since no one seems to be helping you but me I'd suggest you go to a transmission shop and ask them if this is a common problem that may lead to a bad transfer case if not corrected!

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