A local guy who has a great reputation for quiet gear installs on Ford 8.8's asked me if the gearset I bought has a pinion depth number that is stamped on the back of the pinion gear. It is used to calibrate a setup tool he uses to install gears. He said Motive and Richmond gears have it but FRPP gears don't. Ironically he has had great results and quiet installs with Motive and Richmond gears. I have FRRP 3.73's and my set doesn't have the number. He says it makes the install easier and alot quicker. He installed 2 sets of FRPP gears (4.10 and 4.30)in the last week or so and the guys he did it for were very satisfied whth the price and the results. It just takes him longer to install FRPP sets. I know NOTHING about gears except they are in the rear housing. Does anyone know what number a FRPP 3.73 pinion should have? And what ratios are 1st and 2nd in an auto? Thanks