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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: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It looks to be manually operated. Most ive worked with were electric or vacuum. You could disconnect the lever from the cable & see if The high side works or if it is in fact on the low side. If that changes it to the high side you could wire it in that position or hook up the cable & repair it to work.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Whatever it is, the ratios are slow and slower, so, look for some modern 2 speed with higher ratios. 2 speed axles are usually listed or stamped on housing by high ratio only.
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 2012 Posts: 201 Shop Shark | | Shop Shark Joined: Dec 2012 Posts: 201 | As Wrenchbender said, it is mechanically shifted like the transmission. If the lever is still in place, it should not be hard to hook back up. Shifting it will take some learning, but it will be a skill to show off. | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Brad Johnson, that is a double reduction Timken differential very heavy duty and heavy. This was the standard axle for your truck, hope that helps. | | |
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