ARRMA 4X4 Transmission Upgrade Set Boost, ARA210003

First it’s pretty simple to do. You have to remove a total of 6 screws, remove the plastic piece in the gear box and put the new upgrade in. It comes with two drive shafts. One short one long. Use the long one if it’s for the 2x4 Senton and attach the shocks with two screws(bottom screw) then screw in from from underneath the screws that hold the gear box together. Put wheels on and you’re good. Now the RC is really great to drive. It’s a simple yet powerful effective way to increase the fun and power of your RC. Plus there’s a million videos online on how to do it. So no need to be nervous. I also applied a little bit of white lithium grease to the teeth and it runs great! Very highly recommended! A+++++++++

Easy and affordable. Made a world of difference in the granite.

I just love the eas of this upgrade and the difference it makes to the rc car. Next is an S3 upgrade and brushless motor but this 4x4 kit is just awesome.

Added this to my Arrma Senton and it works great.Have run about 10 batteries through with the new 4x4 setup and the transmission seems to be holding up great. Minimal signs of wear and tear. I have run them pretty hard too and it seems to keep up.Would highly recommend if you are looking to add the 4x4 system to your R/C truck.

Best upgrade you can doVery good quality

Operates great. Could have came with a little jelly for the ring gear. And somebody at Arrma needs to do something about the shim being on the wrong side of the diff.

Worked perfectly, easy to install

A great kit, easy install and came complete. Even the stickers were great and not super cheap.