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Determining your rear-end gear ratio.

The only 100% accurate technique is to count the # of teeth on the ring and pinion gears, and divide them.

Need to figure out your rear end gear ratio without actually counter the teeth on the gears?  Here's a reasonable technique:

  1. Put rear on jack stands (safety first!)
  2. Wrap a long cable tie around the driveshaft, but don't cut the 'tail'.  Point it straight up at the 12:00 position.
  3. Put a mark on a tire, like at 6:00 position.
  4. Put the trans in Neutral.
  5. Turn the wheel exactly 1 revolution, noting how many times the driveshaft turns by watching the cable tie.   The key is to be as exact as possible.
  6. Note the position of the cable tie tail.

Now, if the cable tie made 3 revolutions, and is at about the 1:00 position, then it's likely a 3.08 gear.    3.5 revolutions, then a 3.55.  4 revolutions, 4.10, etc.

Not 100%, but should get you close.   The bummer is that it'll be difficult to tell a 3.23 from a 3.31, etc.

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