Can anyone help me with some mods id like to do to my rear leaf shackles?

Im interested in lowering both front and rear mounts by an inch and increasing spring rate

Is there a kit available?
Any tried and true measurements?



I can make some if possible but want to cut out guess work in regards to length
(dont wanna risk going past 90 degrees in the heat of battle!)

Also what about slider kits to eliminate bind altogether??

hmmmmm?

thanks in advance

( car is being built for hills handling )