How do I replace the rear transmission seal on a 1993 Chevy G20 van.

Hi ...first off remove drive shaft ....you will see 4 or five bolts just before the end of the transmission ...remove it to gain access to the rear seal ...pull straight out ...some times you will have to pry slowly to remove it ...then you will see in the shaft that the rear seal is in there ....push in and remove ....put the new seal in the reverse way