Ahead of our jump to the 4S world, I bought the Boost Box metal diffs for the BRCC and got them installed. We took them out to a place here that used to be a WW2 US Army airfield (Miller Field) which is largely unchanged from its original design from back then. Just a massive, wide open grass field that's constantly maintained and mowed by the city. Figured it was the best place to go for a shake down run with the new diffs, plus, my boy and I just felt like letting the puppies run, you know?
Keep in mind that the BRCC is still a stock 3S truck, and I dropped both diffs in right out of the box without any changes. The upgrades/changes to the truck are in my build thread, but the important bits for this issue include metal A-Arms, steel RCAWD driveshafts, and a set of Trenchers. I let Bubba drive the truck around and the first thing he says to me is "Dad, this thing isn't running right. It's constantly pulling to the right". I didn't hear anything abnormal, and thought it might have been a stuck servo which we've been having off and on issues with over the past couple weeks. I had Bub's run it a little closer to me so I could listen for anything and as he's getting closer the truck snaps hard over to the right and starts cartwheeling. I also noticed he didn't turn the wheels when this happened. I get closer to the truck and notice the RR hinge pin pulled out of the chassis and the chassis is broken. I got it to the shop and found out the diff wouldn't turn at all, then found all this mess when I opened it up. Every tooth in the outer outdrive gear was broken off (not stripped, broken), the small center bearing was separated with no guts, and both end shafts had broken splines from the shaft grub screw mounting. The planetary gears don't look all that great, but don't seem to be damaged. You guys ever seen anything like this from Arrma metal diffs before?
Keep in mind that the BRCC is still a stock 3S truck, and I dropped both diffs in right out of the box without any changes. The upgrades/changes to the truck are in my build thread, but the important bits for this issue include metal A-Arms, steel RCAWD driveshafts, and a set of Trenchers. I let Bubba drive the truck around and the first thing he says to me is "Dad, this thing isn't running right. It's constantly pulling to the right". I didn't hear anything abnormal, and thought it might have been a stuck servo which we've been having off and on issues with over the past couple weeks. I had Bub's run it a little closer to me so I could listen for anything and as he's getting closer the truck snaps hard over to the right and starts cartwheeling. I also noticed he didn't turn the wheels when this happened. I get closer to the truck and notice the RR hinge pin pulled out of the chassis and the chassis is broken. I got it to the shop and found out the diff wouldn't turn at all, then found all this mess when I opened it up. Every tooth in the outer outdrive gear was broken off (not stripped, broken), the small center bearing was separated with no guts, and both end shafts had broken splines from the shaft grub screw mounting. The planetary gears don't look all that great, but don't seem to be damaged. You guys ever seen anything like this from Arrma metal diffs before?