Hal9000.
I think the mod you are talking about for the T-case, is the ability to run front and rear wheels indepently of each other. (i.e. being able to shift to only 2W front hi or low, or 2 wheel rear hi or low) for that mod yes you need to pull the case and take out the dent pills or mod the shift rails. but just to be able to shift to the regular 2 low 2 high 4 high and 4 low, you only need to install the twin stick, it acts just like the stock t shifter just easier to tell what gear you are in and easier to engage, the j-shift is eaiser you get the added bonus of getting independently front and rear shifting but the T-case as a little lower range.