Dertermine Rear End Gear Ratio

Tape a length of string to the side of the driveshaft. Mark a wheel and drive one revolution forward. You should be able to tell within a quarter of a turn how much the string has wrapped around the driveshaft.

You can always take the cover off and count teeth.

You should mark the drive shaft and BOTH tires. Turn BOTH rear tires one revolution and count the drive shaft turns. If the drive shaft turns slightly more than three and a half times the ratio is 3.55-1.

Jim

With only 1 wheel off the ground, count the turns of the drive shaft to 1 turn of the wheel, and double that.

If the driveline turned 2 times, the ratio will be 4 to 1

1. Chock the wheels.

2. Engine OFF, transmission in neutral.

3. Put a piece of white tape on the drive shaft.

4. Another piece of white tape on one of the drive wheels.

5. Jack up the wheel with the tape.

6. While counting the turns of the drive shaft, turn the wheel 10 turns.

7. The number of turns of the drive shaft will be 10 times the gear ratio.

Easy as 3.14159265

there's always the fool-proof way of marking the driveline and counting the revolutions while the wheel turns one time.