Very easy transmission to rebuild, get a manual or look on line for free, tells you all you need to know. The bad news some parts are really tough to find. Bearing kit easy synco"s are a bear to find, gears are a tough to find . Input shafts can be found, Also gaskets and seals can be found. Have fun .Pilot bushing can be found easy. Spare parts look for complete transmissions on the bay. That's where I found most of my parts.
https://www.ebay.com/itm/Transmission-Rebuild-Overhaul-Kit-GM-Chevy-SM420-Rockcrawler-BK108/201172915184?epid=686087659&hash=item2ed6d713f0:g:6esAAOSwQItUGN7X
Last edited by sack; 03/23/2020 10:31 PM. Reason: parts location