Choosing the right rear gear ratio for your classic C10 depends on how you drive it and what transmission you’re running. Run too tall a gear with a carbed SBC and it’ll feel lazy; run too short and highway rpm will be miserable.
This thread covers gear ratio selection for stock TH350/TH400 builds, 700R4 overdrive combinations, and tire diameter effects. We discuss 3.08 vs 3.42 vs 3.73 vs 4.11 gears for different use cases and build goals.
For trucks doing the 700R4 swap covered in our other thread, the JY PERFORMANCE Adjustable Trans Crossmember is a key part of making that swap work correctly and then you can dial in gear ratio for your overdrive setup.
What gear ratio are you running and how does it work with your transmission/tire combo?