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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Jan 2019 Posts: 2,243 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,243 | The GMC and Chevrolet parts have different part numbers, but I am trying to figure out if they are functionally different. I know that the GMC controls had white knobs and the Chevrolet had black knobs. The catalogs list the GMC handles as billet parts and the Chevrolet as cast, but it is not clear to me if that was the only original difference or not. I need to get a new temp handle for my '58. If I can't find an original, I am looking at getting the billet GMC part if it will work because I would expect it to be more durable than the cast part long-term.
Anyone know anything? | | | | | Joined: Jan 2022 Posts: 2,489 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 2,489 | They are functionally different in 2 places that I know of..
1. The fan speed switch of one of them (GMC I think, but it has probably been 25+ years since I was in there) has a step in the lever while the other fan switch does not.
2. One of the GMC vertically moving levers (again, I can't remember which one) moves the cable in the opposite direction of the Chevy.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Jan 2019 Posts: 2,243 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,243 | Ok, starting with that info I realized that I had been looking at incorrectly labelled parts. I was looking at people selling Chevy switches with white knobs as GMC, but the GMC switch is noticeably different.
To answer my original question, the temp lever on the Chevrolet pulls the cable up and the GMC pulls the cable down. They shapes are meaninfully different and they are not interchangeable.
Thank you Bill. | | |
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