No need to change shocks on the front when cranking the t-bars. I would suggest that you pop the droop stops out and cut them down to about 1/2 inch(13mm). This mod is free and will let the front suspension drop down a little more. In the rear I doubt that you will need to change the shocks either, but depending on how you lift it you may. If you go with a simple add a leaf and a longer shackle I wouldn't worry about changing the shocks.

1987 trooper LS.'94 3.2, SAS,35's , lots of dents and rust. Now, improved, with more dents.
1995 trooper LS. Wife won't let me improve this one.
1996 trooper. I'll need something to modify when the '87 finally rusts away.