"Those 4:10s were in the trucks with automatic trans."
A popular bit of folklore, but not entirely true. Auto transmission and coil sprung rear is the most common configuration with the 4.10 gears, but they were found in other trucks as well. I pulled my 4.10 center section myself, and it came from a manual transmission truck.
Last edited by GMCpanel; 03/24/2012 10:54 AM.