Suspension lift for K30

[Bulldog]

OK, I bought the BDS 4" lift for my 1987 1/2 ton truck, now I'm looking for a lift for my 1985 1 ton. Actually it's a 5/4 ton CUCV, which I think is just a K30 with an extra spring in the rear pack. This will be my work / trail rig, very utilitarian. I want to keep the rear springs for heavy loads and heavy tongue weight when towing. This truck is also a diesel, so it will need heavy duty front springs.

I would like to go with a 5.5" or 6" lift to clear 35" - 37" tires, but steering correction on the Dana 60 looks expensive. Some say 6" or more lift on them pretty much requires cross over steering. I may have to just go with 4" and limit myself to 35's with minor trimming.

BDS does not offer a kit for the 1 ton. Cherokee at The Performance Shop said the 3/4 ton springs would work and I'd just need to piece together u-bolts and steering correction for the Dana 60. Not sure if I want to go this way.

Superlift offers 3.5" and 5.5" kits with heavy front springs and rear blocks. The 3.5" kit comes with a 3" steering block and the 5.5" kit comes with a 4" drop drag link. The only bad thing about the 5.5" kit is the footnotes say "1977½-91 models require clearancing (machining) of the front driveshaft CV cluster to prevent binding. If vehicle has single exhaust, the cross-over pipe requires modification to clear front driveshaft." 4Wheel Parts website also says "w/o Autotrac; Requires Dual Cardan Driveshaft If 4WD Used Over 35 MPH". Right now I can't spend too much money and new drivelines would put this hold for a while.

I'm also not too keen on rear blocks. I've been looking at Off Road Designs shackle reverse kits which would give me 4" of lift. Combined with their 6" Super Shackles, it would give me another 1.5" of rear lift. So either of these options would go well with Superlifts front springs, eliminating the rear blocks.

Off Road Designs sells Tuff County front springs. The 4" springs have a 495# spring rate and the 6" springs are 465#. I don't know if either of these are heavy enough for the diesel engine. The lady at Off Road Designs "thinks" these are heavy enough, but I want to be sure. I can't find any spring rate data of Superlifts to compare with.

So I guess I'm asking if 5.5" or 6" lift with the Dana 60 requires extensive driveline work or expensive steering correction. Also, would the Tuff Country springs be heavy enought for the diesel?