Pinion Gear - Depth Numbers?

[ZombieK5]

I am doing the numbers to get a working pinion depth and the numbers on the end of the old and new pinion are nebulous.

OLD pinion is on the right and I am guessing the number is +2.45 (Is that correct?)
NEW pinion is on the left and I am pretty sure the number is 0.0 (Is that correct?)

I have no idea what the others numbers are however, the AN022 on the new pinion is also inscribed on the ring gear.

I don't know what the 3,129 inscribed in the old pinion is...

Math says to subtract the NEW pinion from the old

2.45 - 0.0 = 2.45

I will be ADDING .00245 to the inner shim stack on top of the old shim stack total.

Thoughts?

 

[88Silverado]

Im guessing the 245 is also on the ring gear which would identify its a matched set.
Im also guessing the 3.129 is the pinion offset. Since its positive, that would be moved back from the carrier by .003129"
The new pinion shows 0.0. I would set it up with the factory shims and run a pattern and see where it falls.

 

[ZombieK5]

Im guessing the 245 is also on the ring gear which would identify its a matched set.
Im also guessing the 3.129 is the pinion offset. Since its positive, that would be moved back from the carrier by .003129"
The new pinion shows 0.0. I would set it up with the factory shims and run a pattern and see where it falls.

Sent a question to Yukon. I got this back along with the included diagram:


The #s on the new pinion appear to be production / QA #’s not related to pinion depth.

The 245 on the old gear most likely will have that same 245 on the ring gear, these again would be production / QA#’s and not pinion depth numbers. They generally indicate the matched set after being lapped together.

3.129 on the old gear set appears to likely be what is referred to as a pinion checking dimension ( end of pinion head to axle centerline. )

The 0.0 on the new pinion is a pinion variance # ie: +/-0.000” pinion variance , we base that off the master housing dimension , just like the factory does, not the end of the pinion shaft.

Master housing dimension on that gear set is 5.000”