At 4" of lift, soft springs and the inquirey of long travel shocks, It sounds like your building towards a good articulating ride with probably 33"-35" tires. With that in mind, I would suggest a CV Joint but you dont have to go to one. you will however probably need to lengthen your shaft so you dont slip out of the spline when fully flexed. How long is that long travel shock they are making? Ill tell you what though, I really like those 33" Rancho 9000s with 14" of travel, the adjustability is what makes them stand out above all others.But you really have to modify the shock mounts to get that much travel.(look at the attachment picture,looking back towards the rear shocks on my 89 YJ).
Jeff
89 Wrangler
Jeff
Jeff
89 Wrangler
Jeff