I can't say for sure if it was a rcm pinion, but I can't fault it. I kind of neglected to dry and wd40 it after driving it in wet, salty and ice melt chems. Check out the set screw it was a small bolt hanging out too far. It rusted and broke off futher complicating the matter. Also I had a somewhat high motor rpm setup on 6s adding to the friction.
With the slipperential I can dial out the wheelies, and smooth out the power supply.
From the small amount of running I did with the 1520 in the Savage-X it was snappy feeling and seamed as capable to move my Savage around as the 1717.
Here is some long range action with the 6s Savage-X17 on Tera-Pins. I am standing next to the camera guy up in some stadium bleachers using a HK2.4 radio system.
I dont think I could drive from that far away.
1) I couldnt see the dang thing, 2) I'd have haul my old butt down there every two minutes to flip it over, then I'd be dead......
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES