I put the BDS front springs on today BDS part # 004351, I have a pair of BDS part# 004359 due to land tuesday for the rear. The pack has one additional spring over the RC and each of the leaves are .06" thicker than the RC leaves. The BDS bushings are super soft and flexy compared to the RC.
The kid and I drove 30 miles of rough dirt road after instal, parked in the same spot the front of the jeep is sitting right at 2" higher than with the Rough Country springs at the 500 mile mark. I know they will settle a little over time. Much happier so far, still a little low in the front but once the new rear springs are on I will drive a few months and see how things settle out .
We drove about 20 miles before the swap, mainly so I could get feedback from my kid. Other than not having the front drive shaft smack into the exhaust on every bump and no noticible front end dive, I cant really tell a difference but honestly I have only covered about 500 miles since the v8 swap so its all kind of new. The kid thought the ride felt much "springier" and "bouncier".
[url="http://www.jeepforum.com/forum/f12/89-yj-5-3-vortec-swap-1265046/"]MY BUILD THREAD and 5.3 VORTEC SWAP[/url]
I stuck with the 4351 for the back too since I usually have 4 people in the jeep, they were recommended if you have a hardtop or extra armor or weight. so far the only fun has been bouncing on the bumper still getting the rest together