It is possible. I just did an S10 BB to the rear of my XJ, the guy I got the leaf packs off is running 35s on just 4.5" RE coils up front, S10 BB in the rear, no spacers or blocks. He had to cut his fenders a little but he pulled it off. I like the RE kit although more expensive, however I'm actually wondering on a nice Rusty's kit later on. I'm wondering about going all out with a long arm setup, the guy who I got the S10 packs off wants to put on the blocks I gave him but he needs to run a long arm setup on it so now he wants to custom fab one.