Yes, lash adjustment or pinion depth as the case may be. You can use a paint that is made for inspection gear mesh. It is kinda like a yellow liquid lead. you clean off the gears and paint it on the gear face and then rotate the drive shaft to make the paint go between the gears and see what the pattern looks like for proper mesh. You then need to check the lash. You will need a dial indicator for that. What you are looking for is how much slack is there when you move the ring gear up and down. uuuhhh?? Go to the parts house find a Haynes (sp) manuel open it up to the page where it discribes how to do this. With out pictures it is hard to explain. The book also has examples of what to look for in the lead paint as far as a good pattern verses a bad pattern.

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