Just get the BLX slipper -
https://www.ebay.com/itm/Arrma-BIG-...7t-AR102711-/372517031307?hash=item56bbbecd8b
It comes with a 32p spur, so kill 2 problems with one fix.
Buy one now while it is in stock. Then later, when you go brushless, pick up the BLX diffs. Those are easier to find in stock.
https://www.ebay.com/itm/Arrma-BIG-...7t-AR102711-/372517031307?hash=item56bbbecd8b
It comes with a 32p spur, so kill 2 problems with one fix.
Buy one now while it is in stock. Then later, when you go brushless, pick up the BLX diffs. Those are easier to find in stock.