Grinding in either transfer case or transmission

ttpankt4

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Hi I have a 1990 nissan d21. Its the 4cyl 4x4. When I put it into 1st 2nd 3rd and 5th gear, I get a very bad grinding sound. Like the sound of turning rotors. When I put the truck into 4th gear then the noise goes away. It only makes the noise when I let off the clutch and push the gas pedal down. Does anyone know what this could possibly be? Thank you
 

Bigredmariner

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Sounds like the bearings are shot, probably won't be long until you hear the same noise when in 4th gear.
 

Zembonez

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Manual transmissions were notorious for eating bearings. Very rebuildable and a pretty easy fix if you yank it before it craters completely. I doubt it's the transfer case.
 

ttpankt4

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It has 272xxx miles on it. It has sat for 3 years. I'm not sure how much driving its had but I just bought it Saturday for 700 buck and drove home about 100 miles with a lot of stop and go traffic.
 

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