I picked up some General Spring HD leaf springs from Generalspringkc.com. If you are looking for OEM replacement springs these fit the bill. The exact product I purchased was http://www.generalspringkc.com/product_p/90-297hd.htm . I figured I would do a review since I couldn't find anything on these anywhere. I will also follow up with long term reviews later.
Reason I chose them: looking for increased load capability with minimal ride height increase. After talking with them this is exactly what they offered. I was told to expect about 2" lift and it settling to 1 1/2" later on.
The order went well I ordered late on Thursday and they were delivered on Tuesday to Oklahoma. No complaints at all.
The install was pretty straight forward. Needed a 12mm, 14mm, 17mm, 19mm socket and 19mm combination wrench . Also a breaker bar, jack stands and a jack. I also had vice grips, a couple screwdrivers (for leverage), and a tire iron. Would have had beer if it wasn't a mid-day Tuesday.
I referenced the AAL install page for guidance. The biggest difference is I needed help getting the front bushing out of place (hence the screwdrivers and a buddy).
Sitting height before (measured from hub)
FL 20" FR 20 1/4" RL 21 1/4" RR 21 3/8"
Sitting height after
FL 20 1/4" FR 20 3/8" RL 23 1/2" RR 24"
Impressions: ride quality is nice the wife likes it better now. It is more firm but feels great. Handles better in the corners and the inside rear wheel seems to skip less when turning and accelerating.
Before pic: yes I know it's dirty, it is winter in Alaska.
After: still dirty