ST-R drive shafts and Wheel hubs so you can use standard 1/2 offset rims. Use the 11mm hubs to add more track. The light versions are stromger and lighter.

Reference the ST-RR for all the big bore shock upgrades, this will really enhance the truck. Remember to upgrade the front Shock stay and front supper suspension parts as well. You will also require the shock mounts.

The clutch is also a good upgrade, use the Kyosho 3 shoe design from the MP777 series.

When the differentials wear out use the gear sets from the MP777 as well as the diff shafts. The MP777 diffs have 4 internal spider gears. You could add these at any time as well to the ST for more durability.