FOLLOW UP:
The springs flex really good for a $100 set of leafs, but some of the things that are negative are....
*The lenght! They stickout pretty far and I usually drag the leaf and shackle over rocks.
*Double Shackles SUCK! They are long gone, since they caused horrible wheelhop when climbing steep slickrock.
I would not recommend these leafs for anyone with a Bobbed Bed. My shackles stick out past the bumper! They would tuck great under a 4Runner or PU with a stock bed. I am still running these leafs with a single shackle and they flex pretty good. My Shackle in the Rear uses the Shackle Hanger in the stock location, and I am running a 11" Shackle @ a 45 degree angle.
The Double Shackles created a Massive amount of Wheelhop during steep climbs, especially if I was on the Throttle. It was to the point that I didn't even have a chance at some obstacles. The truck was literally Handicapped! Also, if you drove down a steep dropoff, the shackles would unload and Invert. This got to be a PITA to fix.
I don't have wheelhop issues anymore and the springs have held up to quite the beating. Inorder to fit the 37's, I'm running a 2" Block and a long shackle. Total lift of about 6-7".
Any questions?