I'm almost ready to get the truck of for a proper run with some local guys tomorrow. Even just the warm up runs have had me not happy with the noise level. The hard body amplifies things and it sounds horrendous.
I had an SSD 2 speed fitted, but the early runs also showed this was not necessary. With the 2700kv puller pro on 3s, there is more than enough speed for thus sort of rig.
I have been eying helical gear options for a while, so pushed the button last week on the boom racing gear set (helical gears being much quieter than straight cut). I also plummed for the vp transfer case and motor mount hoping that these would help too.
The boom racing gear set includes transfer gears and the main transmission gear pair. I also bought a helical spur and pinion. I can confirm that the boom gears are hard steel. Not super hard like in an automotive gearbox, but convicingly hard enough for me to not worry about them
Stock vs helicals:
I've managed to loose the correct top shaft plastic spacer whilst the ssd 2 speed was fitted. I made a new one from some stainless steel tube. This is just as well since the extra side thrust the helicals will generate would probably eat the plastic spacer.
Everything fitted together perfectly. The bearings were a tight fit in the vp cases - they aint coming out easy if the bearings wear out.
When all assembled i am very happy to report that it runs very smoothly - much releif following the pita fiasco that in the stock axial gearbox. Well done boom racing!
So... the million dollar question... is it quiet?:
It's much quieter. Not as good as i was hoping, but at least it sounds like an engineered machine rather than an agricutural rock crusher.
The big test tomorrow!