RC3000 Drive Motors are about $1276 (new) and $950 (certified crown renew) direct from crown with warranty. If you are actually getting a new Crown motor for that price, you are getting a pretty good deal!
As far as your drive unit checks.
-Draining and inspecting the gear oil will tell you a lot.
-Drive unit noise (Grinding/popping sound)
-Slop in the final
Its just a gear reducer (a box with gears, shafts, seals, gaskets and bearings)
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