Brocky
1/2 ton status
I just found one of these old dinosaurs. Now I am going with the 465 in mine but is the sm 420 any good. Is anyone running one?
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
Sm 420
- Thread starter Brocky
- Start date
Robert79K5
1/2 ton status
Heck yeah those are good transmissions. GM used them in 2 ton dumptrucks.
Check out this link:
http://www.novak-adapt.com/knowledge/sm420.htm
Check out this link:
http://www.novak-adapt.com/knowledge/sm420.htm
wasted wages
1 ton status
I think they have a lower first gear than the 465,,, 
Correct me if I'm wrong,,,
Correct me if I'm wrong,,,
zero cool
1/2 ton status
wasted wages said:I think they have a lower first gear than the 465,,,
Correct me if I'm wrong,,,
Yup. The SM420 has a 7.05:1 low gear. The SM465 only has a 6.56:1.
Brocky
1/2 ton status
Sweat my father took it out of an Chevy years ago. I can remember playing with it as a kid. Shifting gears. We threw it in an old basement of an old house. The house is long since gone but the complete tranny is sitting there. I was looking for a shifter and taught about it. I am gonna haul it home in a few days. My buddy said the same tranny was in his Fathers dump truck, so I said it must be a good low gear. A little research and it says 7.05:1, Sweat
didn't grab one!..
I was probably foolish not to grab one of theese tranny's when the junkyard closed I worked at this year..there were several GM school busses from 1956-1965 there with them --a few of the busses had 5 speed Clark trannys too--I passed on them because of the driveshaft mounted "E" brake assembly--something that I wasnt't sure would be desireable,or whether they could be coupled to a 4x4 transfer case,being 2wd..
...oh well--they are history now.. 
I was probably foolish not to grab one of theese tranny's when the junkyard closed I worked at this year..there were several GM school busses from 1956-1965 there with them --a few of the busses had 5 speed Clark trannys too--I passed on them because of the driveshaft mounted "E" brake assembly--something that I wasnt't sure would be desireable,or whether they could be coupled to a 4x4 transfer case,being 2wd..
...oh well--they are history now.. 
