You can see the new lowers and longer rod ends on the uppers in this photo. This lowered the rear of my Wraith a little, which lowers the overall center of gravity. I also added a grey 55mm threaded standoff between the shock mounts for a little extra beef. I will explain why in a minute. One thing I notice right away when I tried to mock the rear servo up, is the lack of uptravel in the suspension due to the servo case hitting the bottom of the tube chassis.
The servo case hits the chassis almost immediately when you try to cycle the suspension. I bolted the 91mm link into place where the widest part of the lower chassis brace normally sits.
You could also cut the stock plastic chassis brace, and just use the long section to tie the 2 halves of the tube frame together. The aluminum link will provide a lot more rigidity though, so I went that route. Here you can see the brace I removed. Look carefully and you can see the new 91mm link just below the upper links in this photo. Adding that 91mm link and the 55mm standoff between the shock mounts seems to replace any lost structural integrity from removing the stock rear lower chassis brace.
Here is a shot of my rear servo and servo plate before installation. I used the short self tapping M3x8mm buttonhead screws to attach the servo tabs to the servo plate.
I will use the M3x10mm self tapping flathead screws to tie the servo plate to the axle. Then, I will use the M3x10mm buttonhead screws to attach the servo to the tabs. Next remove the rear plastic straight axle lockouts, and inner axle shafts. Secure the knuckles to the C-hubs with four more M3x10mm screws. Then re-install the cross pins and drive hexes. Next we can install the rear steering link. One thing you will notice is the steering link has to be run upside down to clear the differential cover.
Not a big deal, but you will need to drill the existing. Then use one of the 5mm spacers between the drag link and tie rod with the long M3x20mm buttonhead screw to tie everything together. I will eventually trim the plastic boss hanging below the steering linkage, I left it there for now so people can visually see what I am talking about.
A shot with everything buttoned up and ready to roll. Here you can see at full compression of the rear suspension, the servo sits perfectly in the rear cargo area without any interference from the chassis. Since I stretched the wheelbase a little, I did have to trim the cage a little where the plastic chassis brace attaches to the back of the tube frame.
One last adjustment I made was to zero out the caster angle in the rear steer to make life on the rear servo a little easier. It is hard to see in this photo, but the rear steering kingpins are now perpendicular to the bench my Wraith is sitting on. This means the caster is set to zero degrees.
Adding positive or negative caster will put more stress on the rear servo, and it will struggle to center itself in hard binds. One thing to keep in mind when adding rear steer to any vehicle, you may need to add a Castle BEC to your system, depending on the torque rating on the servos you use they may overload whatever ESC you are running. To my surprise after driving for a few hours with this set-up, the ESC was only overloaded a few times while trying to throttle out of a bind and steering with both axles simultaneously.
I am going to try and gear my Wraith down a little to help alleviate that issue. But, in order to have smooth performance at all times installing a BEC is the only way to go. Another thing to keep in mind is you will need at least a 3 channel radio, with a 3 position 3rd channel switch, to have independent control of your front and rear steering set-ups.
I am using my Futaba 4PK radio with my Wraith. Truck Tire Info. Tires - What Hits What Fits. Super Swamper Bogger. Super Swamper SSR. Super Swamper SX. Super Swamper Vortrac. Super Swamper LTB. Super Swamper TSL. Super Swamper Narrow. Interco SS-M16 Swamper. Thornbird TSl Radial. Thornbird TSl Bias.
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Maxxis MA-S1 Marauder. Maxxis MT BigHorn. Nitto Mud Grappler. Nitto Terra Grappler. Nitto Dura Grappler. Nitto Dune Grappler. Nokian Vatiiva MT. Pit Bull Rocker Extreme. Pit Bull Maddog. Pit Bull Growler. Pro Comp Xterrain. Pro Comp All Terrain. Pro Comp Mud Terrain. Pro Comp Xtreme AT. Pro Comp Xtreme MT. Toyo Open Country MT. TrXus Mud Terrain. Mickey Thompson MTZ. Mickey Thompson MTX. Mickey Thompson Baja Claw Radial. Mickey Thompson Baja Claw Bias. Mickey Thompson Baja Crusher. Competition Claw.
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