![]() To help the rear output shaft of the center differential lock into the key of the rear differential you will need to slowly rotate the rear tires until the shaft slides and sets into place. Now with the center differential in place slide the rear assembly back into place until the drive shaft hits the rear differential. Here you can see the difference between the Robinson/Traxxas upgrade part and the stock Slash 4×4 slipper assemblies. Stand the chassis up on its front end and insert the new center diff so that the splined shaft adapter is received by the center drive shaft and can rotate smoothly. Traxxas has already pre-built the center differential housing using 100k weight diff fluid for use with most surface conditions. Now that the slipper gear is removed you will want to mount the Robinson Racing’s spur gear onto the Traxxas Center Differential which is held in place with four screws. Once those are removed the rear assembly will slide out making the slipper gear accessible and easy to pull out. With the gear cover off, there are two screws on the top and two more on the bottom that you will need to remove using a 2.5mm hex driver. First you will want to unscrew the four main chassis screws that hold the rear assembly to the main chassis. Swapping out the slipper gear in the Slash is a simple endeavor. Always get suggestions from other racers and your local hobby store or race track about what gearing ratios to start with. If you are serious about dialing in your truck on varying track types it is definitely suggested you purchase a few different pinion gears with different tooth counts. Robinson Racing makes spur gears specifically meant to bolt onto the Traxxas upgrade diff. To kick things off, I choose to pair the Traxxas Center Differential upgrade with a good set of gears from Robinson Racing. I’ll will also be upgrading the plastic spur gear for a Robinson Racing spur complimented with their line of Absolute pinion gears. ![]() Before I start emptying the checking account on Low CG chassis kits and other stuff for my budding racer, I choose to keep it simple to start by swapping out the truck’s slipper/spur gear for Traxxas’ Center Differential upgrade. With upgrades coming at it from all angles, choosing the right ones is a balancing act of personal finances and choosing the upgrades that immediately enhance performance. If you have invested in a high performance RC model like the Traxxas Slash 4×4, there’s an entire world open to you in the form of upgrades and hop-ups. ![]() I did notice the slipper clutch bearing felt gritty inside, so maybe that's it?ĮDIT: Also, I noticed a couple teeth on the spur gear were starting to become damaged.There is a moment everyone has at the track when they realize that running a vehicle with its stock parts just won’t cut it. The motor definitely doesn't click when it's out (Neu-Castle 1515 2200kv) running without the drive train. I've tried pushing it without power, and given throttle without wheels on the ground and can't duplicate it. I haven't pinpointed where exactly because the noise doesn't seem to happen unless it's on the ground, and I'm giving it throttle, even light amounts. Talk about quick reply, thanks! I disassembled the rear end, checked the gears earlier, lubed and cleaned everything with wd-40, reassembled and still clicking. It might be your center bearing which is where your slipper rides. Have you removed the spur gear cover to see the spur when under load? Can you pinpoint where the click is coming from? ![]()
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