Or HPISavageForum.com. The guys know savages and are ridiculously friendly. For motor you will need to give a budget. If it's unlimited then this is the right forum and brushless is the way to go. 35wt is about the weight you will want in the stock shocks i think. People may say higher but if you are jumping you will start bending shock shafts.
As far as the diffs go
. Check they aren't leaking before putting them in the truck and go to hpisavageforum cause there is so much that needs/can be to them it's silly.
Savage: FLM Conversion, 6s, MMM, CC 1520.
Mini-T Pro: Micro Pro 6800kv, Lipo, HS-81mg, Dirt Hawgs
M18MT: Quark 33A, Y22S 6000kv, FP 2s Lipo
LRP S8-BX: RC-M Conversion, Tekin RX8 B1600KV, 6S.