I am trying to install a set of Yukon gears in a GM 8.2 rear. The problem is they no longer give us a pinion depth! I called to ask about it and they said it was a 'warrenty' issue, people wouldn't go by the gear pattern! They actually give you a shim spec for the pinion, irregardless of what the original gears had. They give you backlash and you check with gear pattern. So here it is, this is what you have to do: Salvage or buy an extra pinion big bearing and hone it to slip fit, install pinion shim to their spec and install pinion to proper preload. Set carrier in place and shim it to the proper backlash as on the ring gear ( .006ish), then you apply gear grease and check the pattern. If th epattern is off then pull the carrier, remove the pinion and replace shim to change the depth, reinstall pinion to preload, reinstall carrier and reshim until you get back to .006 (you changed the pinion depth so your other shimming won't work) and then reapply grease to check pattern. Repeat steps until you get the right pattern. Now you have to take everything all back apart and press the proper pinion bearings onto the pinion and then do the final assembly! When I do Richmond etc they give me a pinion depth, the man that hobbs the gears in writes it on pinion, I assemble pinion with slipfit bearing, install it and measure the depth, pull it out and add shims for proper depth, check it an dpull it out to press bearings etc and reinstall to proper preload - then that is all done! All I do now is set backlash on the carrier. If you measured everyuthing proper when you apply the grease you'll have the prettiest pattern as confirmation. Yukon gear is a bunch of cunts more interested in covering theirs asses, the instructions are vague and generic worded so that when your gears start howling coming down a hill they'll have an 'out' when it comes to warrenty. I love their shim packs but I'll never install another set of their gears.