Here's some other gearing ratios (Straight from my Palm Pilot) that might help you in your calculations.
4-Speed (Muncie SM420)
1st 7.06:1
2nd 3.58:1
3rd 1.71:1
4th 1.00:1
Rev 6.76:1
Lubricant capacity: 6.25 pints
Ref.: SM 420
3-Speed Saginaw (Chevrolet)
1st 2.94:1
2nd 1.68:1
3rd 1.00:1
Rev 3.14:1
Lubricant capacity: 2
3-Speed Wide Ratio T89C (Borg-Warner)
1st 3.17:1
2nd 1.75:1
3rd 1.00:1
Rev 3.76:1
Lubricant capacity: 2.75
3-Speed Overdrive-Locked In R10Q (Borg-Warner)
1st 2.00:1
2nd 1.18:1
3rd 0.70:1
Rev 2.07:1
Lubricant capacity: 2+1
3-Speed Overdrive-Locked Out R10Q (Borg-Warner)
1st 2.85:1
2nd 1.68:1
3rd 1.00:1
Rev 2.95:1
Lubricant capacity: 2+1
