Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2008 Posts: 401 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 401 | I am in the process of looking for a suitable power steering upgrade for my bus. I have a 56 Chevy 4500 short bus. I’ve gone from the original 20” wheels to a 22.5” commercial wheel milled down to 22” with 285/45/22 tires. I’m also switching out the spindles and putting in disc brakes from a 1985 P30 Stepvan. And I want to upgrade to power steering too. Can anyone give any recommendations on what box and pump id want to go with? Also I have a 1974 454 engine and TH400 in it as well. Thanks for any input, suggestions and ideas you may have. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | GM Saginaw steering boxes come in fore and aft movement and crosswise movement, so, start with what movement you have and look for the appropriate box. Boxes can be converted by filing out the skip spline on the pitman arm with a 3 corner file. Outside the frame gives more engine/header room, might have to make up new tie rods, drag link, etc.
What was on that P-30?
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 2008 Posts: 401 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 401 | Mine is a rear mount box so I’ll need to look at that style. | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | On my '37 GMC I removed the rear mount, through the frame box and replaced it with outside frame box ahead of the axle, box from P-3500HD. Put in U joints, and supported end of mast.
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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