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BDC..... ...ah-ha, you have just described the location of the shifter lever in the 6" round dipstick plate behind your right heel for the rare and fragle "Howard" aux tranny. Made by the same English Company that made the rear PTO mounted "Howard RotoVator". It mounts between the N-Tractor's Main tranny output and the differential input. (normally about a 9" hollow inside splined driveshaft) It is an "open-frame" gearbox of about 3.5 to 1 reduction and slows down the tractors groundspeed to allow the rototiller blades to beat-up the ground into a fluffy tilth. Without this slower groundspeed, the rototiller just doesn't work behind the N-Tractor in any gear including the more common Sherman aux 3-speed tranny box. And yes, yer previous description of grinding gears is consistant with a failed "Howard" aux tranny. And NO, I know of NO REPAIR PARTS and neather does the "Howard" Company which has moved to Australia. (former English colony) To service your "Howard" gearbox, you'll still haffta "split" yer tractor, this time at the flange between the main gearbox and the hydraulic differential case. The hollow splined coupler p/n 9N-4605 is usually available used. Iff'n your really curious, do an archive search, N-Board contributor "Willie N" has posted pictures of one of his Howard gearboxes he sold on E-Bay. FYI.....In 1997, just after this great N-Board started, some fellow in Oregon was trying to get people interested in making a "modern CNC" version of the infamous "Howard" gearbox with improved metalurgy and bearings and gears. There was some interest, but the start-up costs were prohibitive. (and he was in the gearbox business)..... ....Dell
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