For bashing i prefer to do the following to improve the stock Flux handling
- Use 1/2 offset wheel or Savage XL extended axles
- Do the tube shock mod and use a stiffer spring with heavier oil (white spring, 45-50 centistoke oil). Put an extra spacer in the rear shock, they need to be a little stiffer than the front
- Use a lower profile tire than stock or mount a high profile tire on the inner bead of a larger wheel
- Tape the tires
- Use a heavy diff fluid in the front and rear diffs (30K-100K) instead of having just the grease.
Those 5 things make a huge difference to the stock flux handling without compromising ground clearance.
Other base stuff for a stock Flux
- Move the ESC forward on it's plate as far as possible (avoids shock damage)
- Do zip tie mod on front bumper arms to prevent them moving aside and letting the top hinge pin out
- Get some velcro ties to secure the battery boxes
- Get BP diffs if it didn't come with them
- The drive gear will start to wear badly after about 10 runs, get the HD replacement
- The pinion needs to be loctited, put some loctite on the shaft as well. it will look like it's hardly wearing for the first 15 or so runs then it will fall to pieces rapidly. Get a decent harded one like a Novak or RC Monster
- Get bearings for the steering rack. the HPI ones are stupidly $ just get cheap ones from ebay or somewhere
- Tighten steering servo saver spring further than advised(still leave room for servo saver to work) or get the HD spring
- Rear tie rod eliminators, better steering servo and 2.4Ghz are nice to have.