Unlike MST's regular ball joint suspension, the FXX-D features pin/hinge style suspension. Same parts that were used for the XXX-D HT suspension.
The FXX-D comes with Plastic uprights to keep the cost down, but have the same dimensions as the new MST KPI Uprights.
The steering design is quite standard. It does feature an offset mount, so by switching it around, you alter the position of the entire steering assembly. Unfortunately the center bridge is not length adjustable for altering Ackerman independently. May I add though that It does come with a second "Ackerman" option hole setting... However this option hole is not useable out of the box. I will get into detail about this when I dissemble the FXX-D.
MST has made specific front axles for the FXX-D, it certainly looks a lot cleaner. The additional rotational mass may be a bonus as well.
Both the upper and lower suspension arms are pin/hinge style, which is great. It helps maintain proper tolerances longer.
Given out of the box is a 30g ballast weight, and you can see the rear-front suspension block is -.5, with the rear-rear block +2.5, giving an effective 3* toe in.
Extra diffuser hole set for optional diffuser. You can also see the 2.5 rear-rear suspension block, with the rear-front being -.5, giving an effective 3* toe in.
The rear diff is a standard ball diff, composed of plastic housings. This may be a shock for some people, but the theory in this design is to act more like a Limited Slip Differential (LSD).
Luckily the plastic diff was given aluminum diff out drive covers to pro-long life and help endure stress.
And finally the transfer case. The transfer case is also composed of carbon gears (the larger two), mating against steel gears (motor pinion, and the smaller gear). Pro of this design? It's a lot more spacious so maintenance would be easier, however, the gears are not standard "Pinion" gears. they are MST FXX-D specific gears, which as of now, has no cross referenced part with any other chassis.