Depending on who you order the kit from they should come with fairly good instructions. And most of the shop manual for the years that used the sm420 have pretty good info to.

http://www.kinzers.com/don/landcruiser/transmissions/index.html

http://members.cox.net/cglabe1/SM420/sm420.html

On the 2nd link just dont do the toyota stuff!

Good luck, Jeff

My 1953 Chevrolet
1947.1 Gallery
1972 C-10 1/2 Ton & 1972 C-30 1 Ton