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What's rear gear ratio are you running?
My 68 C10 has a 12 bolt with a 3.08 gear and a Saginaw 4 speed manual which I really don't care for. This is all behind a GM crate 350 with a Comp Cams Thumpr roller cam, 1:6 roller rockers, Edelbrock Performer EPS manifold topped off with an Edlebrock 600 carb.
I'm planning on swapping out the Saginaw with a Tremec TKX 5 speed with a .72 final gear. This combo should give me just under 2000 RPM at 70 MPH with my 27" rear tires according to the calculator I'm using.
This would all make for a nice highway cruiser but still a little anemic off the line I'm thinking.
The Tremec ratios quoted are 3.27, 1.98. 1.34, 1.00 & .72.
What I don't know is what the Saginaw 1st gear ratio is exactly but from what I'm finding online it could be anywhere from a 2.54 to a 3.50.
I know the Comp Cams Thumpr cam is more for the SOUND and not so much performance but the truck scoots along pretty good as it is now.
So, I'm just curious what others are running for rear gear ratio's with similar setup. Maybe a 3.42 or 3.73 which would put me at 2160 RPM or 2356 RPM respectively at 70 MPH. Still not too bad I don't think.
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