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Did BDX tell you how much needs to be machined?
I talked to bdx and they said the driveshaft needs to be machined. If you look at the stub end of the shaft that is sticking through the small bearing before you remove it, and compare it to the stub end after the wide bearing is installed you will see the need for machining.
Yes, I could use a little clarification on what should be machined also. My expectation would be that the transfer gear bearing shoulder (where the 5203 inner bearing race stops on the transfer gear) would need to be machined down, not the end of trackshaft.
Can a person just grind off 1.5mm from the trackshaft rather than taking the extra time and money to have a machine shop do it?
Gotta machine the track shaft for the most part.... Some sleds are fine without it. Some aren't. It prevents extra side load on the bearing.
Shaving down the shoulder works too except it causes a misalignment of the gears.... Not a huge deal imo unless you are running big hp.