TRANSMISSION GEAR RATIOS COMPARISON
GM T-5 Standard V8 GM T-5 Standard V6 GM T-5 Optional
1ST 2.95:1 3.97:1 3.35:1
2ND 1.94:1 2.34:1 1.99:1
3RD 1.34:1 1.46:1 1.33:1
4TH 1.00:1 1.00:1 1.00:1
5TH .73:1 .79:1 .68:1
Max torque 275 lb ft Max torque 225 lb ft Max torque 300 lb ft
There are optional 5th gear ratios that are matched to the final gear ratio.
Information taken from How to Tune and Modify Your Camero 1982-1998
By Jason Scoot
MGB WITHOUT OVERDRIVE
1ST 3.44:1
2ND 2.17:1
3RD 1.38:1
4TH 1.00:1
5TH J
Information taken from the book MGB by author F. Wilson McComb
The right gear setup
One of the hardest concepts for automotive enthusiasts to grasp is that of gearing on overall performance. Yet the principle is rather straightforward:
Gearing should allow the engine to operate at or near its peak efficiency under given conditions. Knowing the torque peak of the engine is important to determine the gearing necessary for the engine to operate at its best, an important item is the camshaft.
The camshaft controls the rpm peak of torque and horsepower, next is the type of induction, valve size, intake runner size, etc.
To determine gearing follow this formula:
RPM= mph X gear ratio5th X final drive ratio X 336
Tire diameter
65 mph X .79 X 3.90 X 336 = 2925 rpm V6 peak output 2700 rpm
23-inch tire dia.
Fine-tuning of cruising rpm can be achieved by changing tire diameter.