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Mod | | | Forums66 Topics128,048 Posts1,055,540 Members48,425 | | 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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| | | | Joined: Apr 2003 Posts: 942 'Bolter | | 'Bolter Joined: Apr 2003 Posts: 942 | Trying to find out what the overdrive ratio is on an original overdrive set-up on a '72 C-10 3-Speed trans.
'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
| | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | I don't know what it is, but here are the usual ranges and general applications (by no means exact or scientific)
0.62 - 0.65 (usually only as a second overdrive "double over") old big trucks and new pickups
0.73 - 0.75 very common automotive and light truck, newer big trucks
0.79 - 0.86 very common big truck
Grigg
| | | | | Joined: Apr 2005 Posts: 2,097 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,097 | I'm not sure that GM offered an OD in 72. Not to say that it doesn't have one installed. I beleive the last year was 69 which was a full syncro Saganaw 3 speed trans with a BW OD. The OD ratio for that trans is about .70
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: Apr 2003 Posts: 942 'Bolter | | 'Bolter Joined: Apr 2003 Posts: 942 | Grigg, Thanks for the info.
Fred, You may be right on that. The only one I ever saw around here was on what I believe was a '69.
.70 would be great.
'60-'72 Chev/GMC Fan
GMC 9500 Fan
Detroit Diesel Fan
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