*copied from my post on PBB*
Okay, I am thinking that my transmission is toast. 1st through 3rd gear whine pretty loud but 4th, 5th and reverse are still quiet. I have an R151F that I can't afford to get rebuilt. I can get a cheap R150F. I want to swap my Marlin Crawler bellhousing and tailshaft from the R151F to the R150F. Never tried to do this before. Any special tools I need to swap tailshafts? I am looking at pics and the R151F has forward shift shifter base, and the R150F has none as the chain drive case is topshift. Any guidance? Going to start this tomorrow if I get the transmission tonight. HELP...