By removing the variable drive pulleys, did they basically make this the same as a straight three speed model?
(Were the transaxle pulley shafts the same length as on a factory three speed).
The BGB left side shaft isn't threaded, but the right side, which drives the tractor is. My 410 is the same that way too.
My 410 didn't use a PTO clutch there, it drives the deck off a mule drive and the left side of the BGB only ran the tiller which was controlled by belt tension. This is why I'm after these in the first place, the cross shaft on which the lift lever mounts is broken on my 410, I need to find another one so I can lift the tiller. Right now its broke off just flush on the left side.
If that shaft isn't correct, and so much else is different I may pass on the 310 models, or at least not worry about rushing up to get them this weekend.