ok I partially answered my own question last night while pondering it.
let me verify this.
shimming behind the larger pinion bearing will decrease the pinion depth, shimmin the smaller bearing will increase, and pinion nut itself controls the preload.
<font color=blue>You only place shims under the large pinion bearing race, the crush sleeve determines pre-load</font color=blue>
am I on the right track?
<font color=blue>Close...</font color=blue>
also,should the large pinion bearing race be so tight?
Im really having to pound it in and out, can I smooth it up a little, use the old race with the new bearing on the pinion until I hit the target depth, then the final time pound the good race into the housing? will this change my depth? ( onviouslly Ill check it again to make sure)
<font color=blue>Definitely shave down an old race(I used a grinder),it will work with the new bearing.</font color=blue>
also IM measuring the depth from a parrallel across the carrier bearing caps flat surface is this proper?
<font color=blue>I am not sure what you mean?, The pinion depth is determined by the gear pattern that you use marking compound to determine.</font color=blue>
will a good quality 500 Ft/LB impact wrench tighten the pinion nut the last time when I install the crush sleeve ( I know Ill have to sneak up on it to keep the preload within spec, ive got 2 crush sleves just in case)
<font color=blue>I really had a hard time getting the crush sleeve to actually crush. But once it starts to go it goes really fast, I had to buy an additional sleeve after screwing up the first one. Go SLOW!!!</font color=blue>
If I get to checking the pattern ( after setting the Backlash) and its off will it be a result of the inaccuracies of my pinion depth measuring?
<font color=blue>You need to use one of those gear pattern charts, it will tell you what to do depending on what your pattern looks like.</font color=blue>
<font color=blue>Check out my website, there is a write-up on the Model 20 and links to some other sites.</font color=blue>
I know its alot to ask, but im determined to figure this out.
<font color=blue>Good luck, let me know if you have any more questions.</font color=blue>