Yep, due to the ratio difference, I figured you'd need a spacer. But it should work with the correct spacer installed (and longer bolts).
The resistance is measured in lb-ft of rotation torque, on the workbench (clamped in a vise). From my experience, you basically have to make it as tight as possible, while still being able to rotate it at all. If it's too tight, it won't rotate... that's not good. The weird part is how touchy it is, a few hundredths of a millimeter can be the difference between just right, and too tight. It's trial and error, and it took me a dozen attempts. If it's too loose, you won't get as much lockup.
I'd be really careful messing with additives to adjust the friction, if the plates get messed up from the wrong lube, you'll have to take it all apart again to replace them. I used OE LSD lube from the dealer. BTW - did you replace all the discs, or just the end disc?
