Savage as a trail truck?

[Unsullied_Spy]

I've got some 60k oil, would that be enough or should I get something thicker?
I'd rather keep the Savage transmission, Summit trannies are spendy and I should be able to get enough reduction out of the stock one. I'm not rock crawling but if I go brushed I'll probably only be aiming for about 15-20 MPH.
The Flux battery boxes are definitely an option, but I may also look into some other boxes/trays for it.
The problem with the Summit electronics is that unless I can find a steal on eBay I might as well spend $30 on a DeWalt motor (which is better anyway) and then either pick up a cheap EVX2, run a Sidewinder SV2 in High Power Brushed, or find some other option.