My first thing to do would be to drain the oil out of it and see if there is a bunch of metal in the bottom of it. You could pull the side cover and take a look, send pictures when you open it up and someone here will give advice. I may have some parts for you if you need some, I have input, output shafts, cases, complete side cover with shift forks. Dave

1941 Chevy
"First rebuild - complete!"
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1941 GMC resting peacefully
1946/1947 Chevy Street rod on s10 frame complete
1945 GMC panel truck in line for restoration
1941 Plymouth stock complete
1941 GMC COE in restoration process
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1941 Chevy Coe uncertain future resting now