| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Depends how hard you work the load on the PTO. PTO's of sizes in question all have the same 6 bolt mount(there are larger ones) so that is why they all look the same from the mounting point of view, however, the meshing gears are all different, that is why they are trans. specific, not stamped anywhere. PTO shops have mount details based on casting numbers, tooth count, tooth angle, gear position.
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.
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