# Kyoto2.org

Tricks and tips for everyone

# How is pinion measured?

## How is pinion measured?

In our experience, the easiest way to determine the slope of the pinion is by measuring off of the differential cover bolts. All you need to do is to bridge your tool across two of the vertically spaced bolts. Depending on how you orient your tool, you may end up with wildly different numbers.

What do the numbers on a pinion gear mean?

The nominal checking distance for a Dana 60 pinion is 3.125”. However, each matching gear set will have its own ideal checking distance. Often, a pinion will be marked with a figure that shows, in thousandths of an inch, the difference between the nominal distance and that gear set’s ideal distance.

### How do you read a ring and pinion pattern?

(1) Decreasing backlash moves the ring gear closer to the pinion.

1. Drive pattern (convex side of gear) moves slightly lower and toward the toe.
2. Coast pattern (concave side of gear) moves lower and toward the toe.
3. Drive pattern moves slightly higher and toward the heel.
4. Coast pattern moves higher and towards the heel.

What do the numbers on a pinion mean?

Often, a pinion will be marked with a figure that shows, in thousandths of an inch, the difference between the nominal distance and that gear set’s ideal distance.

#### How do you read pinion depth markings?

calculate the size of the old shim stack. calculate the adjustment by subtracting the new pinion marking from the old, being careful to observe the signs. For example, if the old pinion marking is (+4) and the new pinion marking is (-2) the result will be (4)-(-2) = (4)+(2)=(6).

How do I know what gear pattern I have?

Use gear marking compound to paint all of the ring gear teeth. Load the ring gear and run a full contact pattern check. Observe all gear teeth for proper contact pattern and a uniform pattern from tooth to tooth. The contact pattern on the drive side (convex) of the tooth is mostly towards the toe.