jonUF02
Active Member
Hi all, I've had some question about this mod to the diff using Mugen parts. Here are some pics and details.
Purchased complete Mugen MBX7 differential from DollarHobbyz.com
https://www.dollarhobbyz.com/products/mugen-1-8-mgt7-eco-front-or-rear-differential
Currently that specific kit is sold out, but there are others that will work, any MBX7 diff, front, center, or rear.
I tossed out the Mugen cup and spur gear and used the HR aluminum diff cup for Arrma AON1101
From the Mugen kit I used all the internal gears, shims, o-rings, and the output drive cups. The only internal Arrma parts kept were the two cross shafts holding the planetary gears, as the Mugen were just a hair too long to fit the Arrma cup. The kit also came with sealed bearings and an extra "mystery spacer" shim for the outer bearing.
I built up the diff as in my exploded view picture. I had to leave out the large shim between the sun gear and spur gear, as it was too tight to move with this extra shim on both sides. After that, everything is nice and tight but smooth, no play at all. Use the diff oil of your choice. One comment was to add double or triple gaskets between the cup and gear to get the extra sun gear shim in there if you choose, that may work.
The Mugen drive cups are definitely higher quality, the shim kit is available separately, and they are slightly thicker than stock Arrma shims, that is a must if rebuilding with Arrma gears. The Mugen internal gears appear to be better quality and cut than Arrma.
Purchased complete Mugen MBX7 differential from DollarHobbyz.com
https://www.dollarhobbyz.com/products/mugen-1-8-mgt7-eco-front-or-rear-differential
Currently that specific kit is sold out, but there are others that will work, any MBX7 diff, front, center, or rear.
I tossed out the Mugen cup and spur gear and used the HR aluminum diff cup for Arrma AON1101
From the Mugen kit I used all the internal gears, shims, o-rings, and the output drive cups. The only internal Arrma parts kept were the two cross shafts holding the planetary gears, as the Mugen were just a hair too long to fit the Arrma cup. The kit also came with sealed bearings and an extra "mystery spacer" shim for the outer bearing.
I built up the diff as in my exploded view picture. I had to leave out the large shim between the sun gear and spur gear, as it was too tight to move with this extra shim on both sides. After that, everything is nice and tight but smooth, no play at all. Use the diff oil of your choice. One comment was to add double or triple gaskets between the cup and gear to get the extra sun gear shim in there if you choose, that may work.
The Mugen drive cups are definitely higher quality, the shim kit is available separately, and they are slightly thicker than stock Arrma shims, that is a must if rebuilding with Arrma gears. The Mugen internal gears appear to be better quality and cut than Arrma.
