With 242 Tcase and Chysler rear diff, 2" lift typically creates vibes. I experienced that with my prior XJ and 2" lift. I also read that in the JF sticky on SYE.
However, with only 1.25" to 1.5" lift (and stock crossmember) hopefully I won't have vibes and won't need SYE.
However, with 1.25" to 1.5" lift AND a TNT crossmember that raises Tcase and driveline 1", that would be a total of 2.25" to 2.5" change in driveline angle, which would for sure require a SYE since I have 242 Tcase and Chrysler rear diff.
Thanks for explaining about not wanting to lower drive train. I will avoid lowering driveline, and (at least for now) I will avoid raising driveline.
I am going to get Skidrow engine-tranny skid, which works with stock crossmember, though I would like to buy a strong crossmember (with no lift or drop). Anyone know of a stronger cross member with no lift or drop?
I can decide later what to get for Tcase. I'm not going near rocks. At least not any time soon.
Mainly I want weight of front and rear skids installed BEFORE I install lift springs.
If it becomes an issue, I highly recommend the IRO hack-n-tap SYE over the RE one. With the RE it generally cost me about $130 to rebuilt my rear shaft with spicer parts, the stock front shaft took about $90 to rebuild, or about $13 for a good one out of the junk yard.... Guess what I did most of the time?