I needed more steering torque with the 1.5 pound iron bumper, but even without it the steering servo wasn't impressive. Made custom mounts for it using ABS plastic from mcmastercarr of course. To make it fit I had to relocate the receiver box.on top of the servo. I also installed a 1/5 scale steering servo. I replaced the cheap XTM shims with these (about 3-5 in each diff, varies and can be higher). I ordered 8X14mm stainless shims (0.2mm thick) from (part number A370-919). I finally found a fix for these cheap shims. It was obvious when they wore because the gears would skip. I would shim them with the 0.1 or 0.2mm shims but they would wear out and I would have to re-shim. One problem I had was with the differential shimming. I had the brace on long before I put the bumper on. I always had problems with the chassis bending, but putting that brace on ended it. It stands firm with my $5.00 chassis brace. I have hit everything from produce to an old TV (last weekend). I mounted an iron bumper onto my ST to make it a destruction machine. It essentially serves as an upper chassis. With the cooling head of the engine in the way, it will be more towards the passenger side. Drill holes in each shock tower and put it between them. Drill and tap both ends to accept a screw. the chassis needs some firming, but you can fix that with a piece of 7/16" or bigger aluminum rod, a drill, and a tap. This opinion is coming from someone who doesn't race, just a basher.
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