R10Q-1 good. That means the electrical parts are 12 volts.
1972 C-10 standard was 3.73. Options were 3.07 and 4.11 (picture).
I can't prove it but it is said that the Sag 4 speed transmission is weaker than the Sag 3 speed. A compromise to get more parts inside the same housing? I wouldn't dwell on it unless your long range plans are to make it more of a performance truck.
Looking at 1967 C-10 specs, OD came with 4.11 rear axle and was not available for 327 and larger V8s. In 1968, Chevrolet dropped the 283 and replaced it with the 307 V8 which has about the same HP and torque. Judging by the info, I think it would be safe to use the R10Q-1 with 307 V8 as long as it is treated with respect. If you get on it, it can break.
You may want to look at the cost of rebuilding the 307, Sag 4 speed and R10Q-1 compared with pre-built Chevy 350 engine and maybe TH350C. The AD truck guys tend to rebuild the 235 even though it can cost more that a rebuilt 350. It's a matter of have much the pocketbook can stand.
I have a little more info on how the Sag 4 with OD was created. Let me know.
Last edited by buoymaker; 08/17/20216:07 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
