if I have to shim the diffs when i get this thing, where do i find these shims?
easiest way is to buy the shim kit # 81069
Its not specific to the 8e, but has all the shims you will need in the kit to properly set up your diffs.
You can either open up your diffs now and see how tight they are and add shims IF needed...
Or drive the truck and found if if they are shimmed well. My diffs lasted 10 packs before I had an issue. Others have had a diff fail in just a few packs.
Also, if you buy the ezrun program card (ebay) this helps ALOT. The stock punch control and brake force settings are too high IMO. A softer punch setting and brake setting will save the driveline alot of stress...and actually help make the drive easier to drive as well.