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mumzer

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Posts posted by mumzer

  1. i have an lq9/np149 combo in my truck that is beginning to act flaky. No spectacular failure...when the case is hot...after long freeway drives...it clunks during sharp turns like an old auburn diff without friction modifier. Problem is most pronounced pulling into a parking space.

     

    It feels a lot like a front LSD with no friction modifier, but obviosly, it doesnt have one.

     

    i took the truck to chevy, who acted clueless, said they couldnt replicate the problem, and didnt know about the factory test procedure to evaluate the viscous coupling. I set them off to find the TSB, and they claim the coupler tests fine. I think they failed to get it warm enough.

     

    Am i on the wrong track here with the source of the failure? i am pretty darn sure its a worn out 149, but would love a second opinion.

     

     

    Note - truck has 115k miles and significant towing and snow use. Power levels are near stock with basic bolt ons. Tires are new. diff fluids are new.

  2. sorry to high jack your thread but can you explain exactly what happened?

    these transfer cases are pretty strong but I worry about mine breaking. I am pushing over 800 ft lbs of torque through mine and it is holding up. I have a spare just in case mine goes Boom.

    Mark

     

    no spectacular failure...its just worn out the viscous coupler after 115k miles. Hard to get too upset about it as we have used the truck to tow a race car quite a bit, and for lots of trips to snow country.

     

    they have a finite amount of slip in their lifespans, and i have reached the end...when the case is hot...after long freeway drives...it clunks like an old auburn diff without friction modifier.

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