Just came across this thread. In case it may still help, here's a link to a step-by-step thread I put together on doing the leaf conversion:
http://www.rccrawler.com/forum/1-9-s...e-chassis.html

Once you switch to leafs, shock length (assuming you remove the coil springs from the shocks) doesn't matter as much. I was very pleased with how it all came out. Here's my rig review with footage in action:
https://youtu.be/CtyahqDzweg