Bextreme04
Full Access Member
- Joined
- May 13, 2019
- Posts
- 4,436
- Reaction score
- 5,564
- Location
- Oregon
- First Name
- Eric
- Truck Year
- 1980
- Truck Model
- K25
- Engine Size
- 350-4bbl
So... just looking at a basic calculator here. What size tire do you have? According to this calculator: https://spicerparts.com/calculators/engine-rpm-calculator with a 31" tire and 3.73 gears, you would be at 2283RPM. With a 28" tire and 4.56 gears, you would be at 3090RPM. Which is right about what you are getting.