After some consulting with @WHITE-TRASH I decided to build a Capra axle for the rear to get overdrive since it was about the same cost as overdrive transmission options I was looking at, but had the added benefit of more ground clearance. He also recommended me a cheap carbon fiber chassis off Amazon to move my drivetrain forward to to help my forward weight bias as well as get my truck lower. I also abandoned the idea of running water in my tires and went to a foam setup.
I decided to weigh the SCX10 chassis setup as well as the transmission while I had everything apart.
Axial 3-gear transmission with a 93T 48P spur gear sans motor, 86g:
I used a stock Axial Capra housing (AXI232005), Axial hardware (AXI235016, AXI235014, & AXIC3165), Axial stub shafts (AXI232008), SSD 27T/8T overdrive diff gears (SSD00349), SSD Locker (SSD00196), Treal 19T/16T Overdrive portal gears (X0034LUD9B), Vanquish axle shafts (VPS08083), and a TRB bearing set (140041).
With the overdrive diff gears and overdrive portal gears, my rear axle ratio works out to 4.01 vs 3.31 for my front axle which is about a 21% overdrive on the front.
The new parts:
I needed a much longer rear drive shaft for the new chassis, so I bought another one from Injora since they are cheap and all metal.
The foam setup for the Ruptures. I ended up using the foams that came with the Ruptures in my Moabs and they seem to work perfectly in the Moabs.
The chassis rails I used. Link to the cheap Carbon Fiber Amazon Chassis
The Capra/AR44 axles have a 1.063" ring gear vs 1.482" for the AX10 axles. I was concerned at first about the durability compared to the AX10 axle, but it has held up great.
I am not sure why this was the case, but the SSD pinion had some clearance issues with the SSD locker. I just chucked the locker up in my cordless drill and sanded that side of the locker down a bit.
The other big issue I ran into is that the Treal 16T/19T portal gears do not fit in the stock Capra housing. I used my Dremel with a 1/4" sanding drum to remove the bulk of the material, then I wrapped some sandpaper around a 1/2" drill bit to finish it up. I was a bit uncomfortable with the amount of material I had to remove, but it has holding up so far; you have to really cut into two of the screw bosses for mounting the portal cover.
I decided to weigh the SCX10 chassis setup as well as the transmission while I had everything apart.
Axial 3-gear transmission with a 93T 48P spur gear sans motor, 86g:
I used a stock Axial Capra housing (AXI232005), Axial hardware (AXI235016, AXI235014, & AXIC3165), Axial stub shafts (AXI232008), SSD 27T/8T overdrive diff gears (SSD00349), SSD Locker (SSD00196), Treal 19T/16T Overdrive portal gears (X0034LUD9B), Vanquish axle shafts (VPS08083), and a TRB bearing set (140041).
With the overdrive diff gears and overdrive portal gears, my rear axle ratio works out to 4.01 vs 3.31 for my front axle which is about a 21% overdrive on the front.
The new parts:
I needed a much longer rear drive shaft for the new chassis, so I bought another one from Injora since they are cheap and all metal.
The foam setup for the Ruptures. I ended up using the foams that came with the Ruptures in my Moabs and they seem to work perfectly in the Moabs.
The chassis rails I used. Link to the cheap Carbon Fiber Amazon Chassis
The Capra/AR44 axles have a 1.063" ring gear vs 1.482" for the AX10 axles. I was concerned at first about the durability compared to the AX10 axle, but it has held up great.
I am not sure why this was the case, but the SSD pinion had some clearance issues with the SSD locker. I just chucked the locker up in my cordless drill and sanded that side of the locker down a bit.
The other big issue I ran into is that the Treal 16T/19T portal gears do not fit in the stock Capra housing. I used my Dremel with a 1/4" sanding drum to remove the bulk of the material, then I wrapped some sandpaper around a 1/2" drill bit to finish it up. I was a bit uncomfortable with the amount of material I had to remove, but it has holding up so far; you have to really cut into two of the screw bosses for mounting the portal cover.