Turning wrenches for Porsche doesnt qualify you to regear axles. Maybe your not a newbie, but you are to axles, and being a solid axle makes no difference to installing a gear set. If you have to use the excuse of European cars not using solid axles than you are in over your head.
I am honestly not saying this to be rude, but gearing is not a simple, read about it, and go and do it kind of thing. It takes experience and feel to get it right. Im firmly believe if you want to do axles, you need someone with experience to show you, at least once, but the more the better.
Since Im sure you are going to do it anyway, which is fine, and I hope works out for you, here is some actual info.
The crush sleeve is only to set pinion preload. This should be readily available info in any search.
The backlash is easy with an 8.25 because of the spanners. But remember that these are also responsible for carrier preload.
Also, remember that anytime you adjust pinion depth, you will change backlash, but it wont really matter as you have to pull the carrier everytime you adjust the pinion.
If you overtorque the crush collar, you need a new one.
If you have to reset the pinion and have already installed the crush sleeve, you need a new one.
They also take 250 ish ftlbs. minimum to start.

 

On top of all this useful info, you will need an in/lb torque wrench to set the preload on the Pinion, then you will need the special tool that adjusts the spanners for the carrier bearing preload/ring gear back lash and a ft/lb torque wrench to preload to 75 ft/lbs. Also, I believe it said in the original post you were gonna pull 3.55's out of a YJ, I don't ever recall a YJ coming with a Chrysler 8.25 axle, let alone 3.55 gears in one, generally the YJ's with 4.0 and ax15 had 3.07's and the 2.5's had 4.10's unless you found and a YJ with 4.0 and Auto, but either way a D35 Ring and Pinion will not work in your 8.25 housing.

 

He said JY, not YJ

 

sorry, appearantly I am dislexic and mildly retarded..........you should see what happens when I transpose numbers programming Multitask machines

 

if u have a Pain in ur rear then set on a donut...Lol