I have a RoughCountry 4.5" lift on my '92 XJ (new coils, add-a-leaf, new shocks, drop shackles) came with transfer case drop spacers. Have not had any problems with rear driveshaft and do not have a SYE, just stock DS.
'92 XJ, 4.5"lift, 4.0L, D30 lockrite, Chrysler 8.25, 33x12.50x15 Bias TSL's...