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| | | | Joined: Oct 2005 Posts: 43 'Bolter | | 'Bolter Joined: Oct 2005 Posts: 43 | I an trying to find a PTO that fits a 1957 New Process 5 spd from a 6400 Chevy . Or does anyone know which PTO fits this transmission? I have two SM420 tranmissions with PTO's any chance they might fit | | | | | Joined: Mar 2004 Posts: 6,228 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,228 | PTO's all use the same SAE 6-bolt housing but they have different driven gears, so the SM-420 will bolt onto the NP-540, but the gears won't mesh. You need to find the correct unit for your NP-540. Mike B  | | | | | Joined: Sep 2011 Posts: 1,458 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,458 | Don't those np 540 boxes have provisions for pto on both sides?
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Mar 2004 Posts: 6,228 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,228 | Don't those np 540 boxes have provisions for pto on both sides? Yes the NP-540 has the PTO provisions on both sides. The drivers side runs off of the reverse idler gear. The passenger side runs off of the second speed counter gear. With that said, I believe the PTO driven gears would be different based on which side you mounted the PTO. PTO's could be bought with the output shaft pointing forward or backwards, gear reduction/high torque, 2-speed, forward and reverse etc. Most older dump hoists and wrecker winches used a single speed (one gear) PTO. Mike B | | | | | Joined: Sep 2011 Posts: 1,458 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,458 | Thanks for all your info Mike. I've got a pasture art rig with a 540 direct in it, just waiting for a rig to put it in.
Last edited by Peggy M; 02/10/2024 2:31 PM.
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | It is unfortunate PTO’s are not marked as to which trans they fit, too many different gear combinations. Never found book of PTO combinations. I always mark PTO’s I remove as to where they came from. I have two off 420’s I am saving. Found a PTO idler gear for my ‘54 GMC 630 by just searching on EBay, lucked out.
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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