Found a lifted grand cherokee a the jy...will the lcas work on my 94 cherokee?

Yes they will fit if they are from a zj 93 to 98.

Ok thanks. I'm trying to do a jy lift will the rear springs work for the front as well?

Only the front parts will work because a ZJ has coils on all four corners. I'm guessing it's a ZJ, WJ parts won't work except some have made the rear lowers, I think, work for front lowers because they are slightly longer. ZJ front suspensions are the same as an XJ but the V8 versions sit about an inch higher so a little more lift on an XJ.

The rear coils are the same diameter as the front but dont know how much lift you would get out of them as the fronts would be taller so you may need to try them and see where it sits. I have heard ppl using the rears on the front but i have not tried it. The rear lowers will work on the front also most after market lca fit front or rear on tj or the zj and front of the xj, mj. So if you get all 4 you can use 2 and sell 2.

Ok so I guess ill snag the rear lca and measure the springs

Rear springs will be 3" shorter than the front so if it's got a 3" lift they will be the same as stock front springs and so on.