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Noticed a couple dime sized drops of oil on drive way. Am a stickler about that and investigation reveals the dreaded and well known transfer case oil pump rub. Over time a hole is made leading to fluid loss and unless caught in time, will slowly kill your GM T-case. Mine is the NP263XHD but it affects many similar GM T cases. If you have a 2001 forward GM T case, best to check it out sooner than later. There are many after market products to fix it before its too late-- but still requires T case be dropped. Ugh... DEalers not too interested in advance warnings, so driver beware. Am headed out end of week for a 900 mile road trip and as luck has it, this is discovered at the last moment- seeps par for the 4x4 course. You tube explains it all:
2001 2500HD 8.1L with Allison 1000. Warn M12000 winch with dual batteries. Assisted in the recovery of a jeep that rolled into a deep gully. Hard pulling and amp draw at about 10 degrees side hill-- near level. Truck in park and ebrake fully engaged. Hard pull really put load on system-- ran up RPMs to help recover some juice. At one point winch stopped working due to insufficient power. (Should have used the snatch block.) Winching force actually pulled truck sideways about 4'. While winching also stood on brake pedal and at times it was nearly all the way to floor. Relevant fact: high RPM for about 10 minutes while tranny in Park and T case in 4 low. Ran up RPMs while winching so alternator could generate amps. Heavy amp draw ands stood on brake pedal (to hold position and not get pulled into the deep gully). Eventually got him out and was time to go. Put truck into drive and....nothing. Reverse...nothing. Uh oh. Toggle between 4 low, 4 high and 2 high. Nothing. No sounds, no indication of anything moving. Now the rescue rig needs help. Another vehicle pulled me onto level ground and turned off engine. Let it sit for about 5 minutes pondering what to do so tried again. Upon start up, all is normal and drove home w/o issues. Any explanation why/how a period of high RPM in park will neutralize the tranny? Or did the T-case go into a fit? since only a very slight side hill do not believe it was fluid starved. Thanks, Mark
The emergence of late model 4x4s with IFS began with the S/T trucks and culminated in the introduction of 1987 Silverado and Sierra trucks with IFS. I worked closely with Chevrolet and GMC trucks during the 1987 to late '90s era, ultimately having great respect for these S/T and K-model trucks. The popularity of modern G.M. truck technology is indisputable: If you add GMC to Chevrolet figures, G.M. truck sales have often outweighed Ford F-series and others. This forum is a community of enthusiasts who value G.M. technology, design and ruggedness, including the 6.5L and Duramax diesels, the small- and big-block pushrod V-8s, Vortec V-6s and contemporary LS engine platforms. Join others here!—Moses Ludel