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Mod | | | Forums66 Topics128,161 Posts1,056,906 Members48,458 | | Most Online14,466
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
with Ads!  Again, thanks!
| | | | Joined: Apr 2005 Posts: 2,101 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,101 | It turns out that the OD gear box with the R-10K-1 designator is somewhat different. It has a shorter spedo housing & gear, casting for a rear mount, and a fine spline output shaft (like a TH350 or powerglide). The main differences are the internal gears in the trans itself. It appears to be one of these odd units as none of the regular SM318 gears will interchange.
It could be expensive to rebuild as it needs a cluster gear & a L-R slider. I usually pick up regular 3 speeds to use for parts but they won't work for this one.
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
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