I don't mean to hijack the thread but im also looking in to a aal or rear blocks for a little bit more height so when i load my truck up my back end will sag to a similar height to my leveled front.

 

if you do the helwigg system then your should sit level with nothing. I did a 2.5 front level and even with the helwigg it still sits half an inch higher in the front

 

sorry its taken a while to get back on. But I hauled a load the other day remembered to measure it and it dropped about an inch less than before. that may not seem like much but the helper leafs get stiffer the more weight you put on so it dont have the worry about hittin a bump and having the tires hit the body reguardless of the weight. over all for the kit was worth it because of the ease of install, another option i went with on another truch i has was to go with coil over springs in the rear, and really they have about the same ride, so thats abother option

 

really glad I got them now. Today I didnt have to tow but I had to pick up and deliver 50 bags of 50lb salt. With out it body and tires would have had an unwelcome meeting