nice, how much playing around with the spring packs did you end up doing and what led you to that as a solution? my first ‘40 had minitruck springs circa early 90s up front to stretch the wheelbase ~10”, I think my 17yo self was just looking at spring dimensions at the time to figure out a stretch without a bunch of rework outside of driveshafts.
worked out pretty well with some additional leaves, I am sure I would’ve killed the main leaf quickly had I not had to sell for $$ in school.
better pics somewhere, but looked like this…SUA. was a cool rig, prob would buy it back if I found it:
View attachment 4179003
That looks like a fun 40.
My previous setup in my 40 involved mini truck based springs in the rear sua. I liked that setup but it was too low the way I had it
Ok some thoughts that went into this current configuration
I ran pretty close to this sua/soa spring set fr/rr on my old bj60 and it worked well there.
I didn’t want the extra complexity doing a low front soa at this time. I had to get it done by a deadline so I stayed sua.
I already had the springs in my parts pile so I could measure and decide what I wanted from different packs that I had.
The front 40 specific belton 2” I ran before were too short as they were and any more arch would be even worse. Poor shackle angle and limited droop for sua
The 70 frt springs had length I wanted and military wrap. They were unknown manufacturer jdm lift springs and had plenty of arch. Just had to adjust for center pin location.
I did combine leafs from a couple different packs for front.
Rear I have an aux gas tank and couldn’t go back much further. As is it could be a bit better centered.
To keep u-joint clearance from binding on full droop and to keep driveshaft up a bit I used a double cardan rear. Set pinion angle up while doing rear soa.
The long 60/70 stock rears started flat under load. This worked well for the height I needed. I made my best guess on the rest of the pack but I do still need to add one more rear leaf and different shocks. Didn’t quite get that right and rubicon trip ended up being my shakedown to see how it all worked.
The 60/70 series springs have the bigger bushings and pins so I sourced late 40 series hangers to work with that. At least fixed end. Shackle side I still have mismatched with small bushings on frame side.
It’s trial and error to find what works the way I want with the dimensions/attributes I’m after. And I tend to do things the hard way not just getting off the shelf stuff. Trying to keep this truck a mild build with close to stockish appearance