Those old 305 and 351 V-6 motors were some of the most rugged GM ever built--I used to service them at trade school,they used them in most of the school busses.I have seen 2 GMC trucks with them in it,a 72 1/2 ton 2wd,and a 66 GMC 3/4 ton,both had the SM465 tranny--never saw one in a 4x4 but I suppose they did make them--their biggest downfall was the stromberg carb they decided to use on them,we switched most of the busses to a holley or rochester 2 barrel when they started acting up.Most of the busses had over 200,000 miles,and most had very little work done other than oil changes.They didnt get good gas mileage though--some of the newer buses with 366,427,or454 motors got better mileage than the V-6(the 401 and 478 V6's were hogs at the fuel trough too!)
I saw an unusual truck the other day--a 1963 GMC,either a 3/4 or one ton(8 lug axles anyhow) with a FACTORY detroit deisel in it--not sure but I think it was a 4-71?? looked very close to the one in my friends trojan loader--the truck was like brand new,the original owner was driving it!--but he was in a rush and couldnt stop and tell me more about it--I'd like to check that truck out--I know they were offered back in the 60's,but thats the first one I've seen up close. /forums/images/graemlins/crazy.gif
