Now go back to post 17 which is what I was talking about and quoting. At this point when you have the ring and pinion this close,to take pics that I can see the teeth. Why wouldn't you just count teeth?Why would I tell him to look up the RPO? No guess work there at all. Count the teeth it's 100 percent.
If you have the cover off - the gear count is OEM-stamped into the outer periphery of the ring and on the inside stub of the pinion.
Most times, the number will appear like this ---> 33:6 or something like that.
These gears are machined together and have match-marks to keep someone from putting the wrong gears together and shipping them out as a pair.
I had the gear count on my old OE (3.08:1) gears and the same metric was stamped on the ring gear I got to replace them.
Funny enough --- GU4 is the same RPO code posted in my glovebox for 3.08:1 too!
Whatdoyouknowabouthtat?