Large Hatch (Hercules) M4 Tanks

[keilau]

The gearboxes look like the Heng Xin ones. The case is actually metal and they have a base plate that mounts in the tank. The gearboxes then have 2 screws and a metal slide tab that holds them in place. Once the two screws are removed, the gearbox slides out.

https://www.toucanhobby.com/products/hx-dgb-s-ml59-bearing-dzn1?pr_prod_strat=e5_desc&pr_rec_id=cd3f267ba&pr_ rec_pid=8009474441466&pr_ref_pid=8009474343162&pr_ seq=uniform

I use the Heng Xin all metal gearbox on the Heng Long 3898 Sherman M4A3 too. The gearbox is a very easy fit, but limited to 380 motors. I use Tamiya standard 380 with power to spare for the Mato metal tracks. Highly recommended combo. Mato's 1/16 metal tracks are currently the most realistic and highest quality metal tracks available for the M4A3.