Jeep Cherokee NP231 Transfer Case Noise Solved!!!

Diagnosing some drivetrain noise out of my NP231 transfer case in my 1992 Jeep Cherokee XJ. Note - I have a slip yoke eliminator.

Initial problem: I’d get a loud whine only upon acceleration throughout my speedometer. Put it up on jack stands heard some inconsistent not very loud teeth on teeth sounds out of my T case. Took out part and contacted Advance Adapters to get their take on it. I’ll let you guys know what I find.

Solution: I eliminated the grinding noise by changing the thickness of the main gasket: when re-assembling the case halves, I let the permatex liquid gasket maker cure for an extra hour before tightening the bolts up to torque spec. This provided enough clearance in the case for the gears to have just a tad more room. It's interesting how the thickness of the gasket can actually change the clearance of the gears in the case. Good luck and subscribe! :)

[ttv_saltyshooter]

I got a 89 jeep cherokee xj front end is popping and grinding was stuck in 4 i believe so removed driveshaft any more information on it would be nice because it was locking up my turn and previous owner insta one now its making noise in the frint

[swansoninspections]

Your blind bearing at the bottom of the main shaft was not set properly. Mine was too deep. Had to tap it back from the under side that’s resting on the bench.

[mortenhjorth-johansen]

My NP231 makes a whining noise after I drive 15 min. Goes away after car gets cold. If I remove the front drive shaft I have no noise.

[doublebasserrazzmuss]

Hello. '08 5.7 Jeep Commander. My transfer case sounds/feels like its binding up the two driveshafts. any suggestions? thank you for your time.

[matthewluna]

Do you think this sound can cause catastrophic failure within the transfer case? I have this same sound..

[mathewmiller]

So what was it ? My dakota making the same noise

[DooberD]

I got a clank I can’t tell if it’s my tranny or transfer but I feel it under my feet and that’s where my transfer is