OK if you need to spin 3000 in third to go upa grade with your current tire size, something is wrong. A big block should be able to lug that in fourth easily.
Wow that's bad.
Ever driven anything with an NP435? They were put in trucks that actually did work. Again, for me at least, they are not practical for regular driving.
Here's the results from the Wallace Racing RPM drop calc.
Click here for the calculator. Gear Shift Drop Calculator
RPM: 3,000
Rear Gear Ratio: 3.23
Tire Diameter: 28"
Gears in Tranny:
1st Gear Ratio: 6.68:1
2nd Gear Ratio: 3.34:1
3rd Gear Ratio: 1.66:1
4th Gear Ratio: 1.00:1
After 1st Shift: 1,500 RPM. 50.00 % RPM Drop
After 2nd Shift: 1,491 RPM. 50.30 % RPM Drop
After 3rd Shift: 1,807 RPM. 39.76 % RPM Drop
1st Gear is 11.59 MPH at 3000 RPM
2nd Gear is 23.17 MPH at 3000 RPM
3rd Gear is 46.63 MPH at 3000 RPM
4th Gear is 77.40 MPH at 3000 RPM
