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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: Jul 2005 Posts: 66 Shop Shark | | Shop Shark Joined: Jul 2005 Posts: 66 | Is there a difference between the car overdrive and the truck overdrive 3 speed? I found a trans, but the number on the overdrive unit is R10K-1. Everything I have found refers to R10H-1A or R10Q-1. If the main trans is different, could I just put the overdrive unit onto my truck 3 speed?
Thanks!
Andy | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | There isn't any difference from car to truck for Chevy/GMC. Could it be that the "K" that you're seeing is actually an "H"? Sometimes those old castings can be hard to read, especially if they're a little crusty with road crud. As far as the main trans goes, there are diffences between the O/D version and the standard, mainly it's in the extra holes for lube and the reverse lockout mechanism. As long as it's a GM trans, it will be a bolt in, no need to mount the O/D unit to the original trans. Check out my pix from my signature on the bottom to see how mine's setup.
Bill Burmeister
| | | | | Joined: Apr 2005 Posts: 2,102 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,102 | Andy,
Two minor differences but should not be a problem. The bottom mount holes on the pass car trans are not threaded so you need to use a longer bolt with a nut. Also you will probably have to use the side cover from the truck as the 2-3 shift arm points up on the car. Both levers on the truck point down.(except for 55 6 cyl)
If both have the 4 bolt side cover you are good to go.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: Jul 2005 Posts: 66 Shop Shark | | Shop Shark Joined: Jul 2005 Posts: 66 | | | |
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