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Jul 21st, 2025 | | | | Joined: May 2016 Posts: 56 Wrench Fetcher | | Wrench Fetcher Joined: May 2016 Posts: 56 | So, I have a GMC 1 ton dually. 4 speed tranny. I'm looking for a pto to go on said truck.
Are all pto units the same for that time frame ? If not how do I go about finding the correct one ? thanks, Charles
I just finished a 1946 chevy pickup street rod
now on a 1950 chevy 3100
.
also a GMC 220 with duals
and a 1948 chevy 2 ton
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Year of truck? SM-420 or 465?
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: May 2016 Posts: 56 Wrench Fetcher | | Wrench Fetcher Joined: May 2016 Posts: 56 | I don't know. how do i tell the difference?. one is in a 1 ton and the pto I'm looking at is from a bigger truck, not sure which model
I just finished a 1946 chevy pickup street rod
now on a 1950 chevy 3100
.
also a GMC 220 with duals
and a 1948 chevy 2 ton
| | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | https://www.novak-adapt.com/knowledge/transmissions/manual/The 465 has some fins or webs cast on the case, the 420 is pretty smooth. PTO should fit any of same model transmission it is removed from. For interchange between models, if any, check PTO manufacturers literature. PTO openings are pretty standard, same bolt patterns. But often need a different driven gear in the PTO for different transmissions, even though the PTO case may seem to bolt up. Also be aware there are many different kinds of PTO’s for different uses. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | If a '50's truck, a 420. Best to figure out first, submit a picture if not sure.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| | | | | Joined: Dec 2015 Posts: 2,061 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,061 | easiest way to differentiate between SM420 and SM465 is the 420 only has one PTO outlet (driver side) and 465 has it on both sides.
Later versions of the SM420 had two horizontal ribs cast into the passenger side of the case so, just because it has some ribs on it, does not mean it is not an SM420.
The link Grigg posted has lots of info on these transmissions and how to identify them. | | | | | Joined: Dec 2011 Posts: 241 'Bolter | | 'Bolter Joined: Dec 2011 Posts: 241 | I have.....
Mark
Last edited by Grigg; 01/13/2018 2:14 AM. Reason: Please send PM about parts for sale or free
| | | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | The best place to find an SM420 with PTO is in the 4100 and larger trucks.
| | | | | Joined: Dec 2011 Posts: 241 'Bolter | | 'Bolter Joined: Dec 2011 Posts: 241 | Sorry Grigg...PM sent Mark | | |
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