Quote Originally Posted by Duane View Post
I did it, when my Fire Dept built my truck, they received 2 m715s from DRMO, they decided more was better, so they took all the springs apart and doubled all the leaves, (there are pics of the spring in my photos in my profile) I disassembled them, put them back to stock, new center pins, new bolts on the clamps, and it worked out great, I didn't put any slip coat on them, because the spring place we use from work told me they are made to have friction between the leaves, but I really don't think it would have hurt.

Duane
The spring shop told you the basic truth, that friction acts as a shock absorber so they don't flex too fast. Lubing spring leaves can make them exceed their rating and eventually cause them to break.