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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: Apr 2014 Posts: 35 New Guy | | New Guy Joined: Apr 2014 Posts: 35 |  I need help identifying the tranny on my 1948 GMC 1 1/2 ton with a 248. I don't know how to use the picture thing so I will describe it. 1st is far left/up. 2nd is down/right/up from 1st gear. 3rd is down from second. 4th is up/right/up from 3rd gear. 5th is down from 4th gear. And R is up/right/up from 5th gear. | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | I'm not sure I follow your description. A 1 1/2 ton probably would have not come with a 5 speed, but that doesn't mean that it wasn't retrofitted. The most common were as follows:
Clark | Clark OD | Spicer | Spicer OD | New Process
24R | 25R | R24 | R25 | 124R
351 | 341 | 135 | 134 | 35
The top gear being toward the dash and the bottom gear being toward the seat. Note that the OD transmissions have 5th gear toward the dash. Except for New Process. They used what we called an X cover and both had 5gear in the same place. New Process was awkward because 1st and 2nd were beside each other. Clark had Reverse above 1st which was good for rocking a vehicle when it was stuck. | | | | | Joined: Apr 2014 Posts: 35 New Guy | | New Guy Joined: Apr 2014 Posts: 35 | sorry crewnwelge that I couldn't describe it understandably, but the bottom gear (1st) is toward the dash, top gear (5th) is toward the seat, and reverse is toward the dash but on the opposite side of the cab that first is on | | |
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