Jean..... ...I don't know what makes yer NAA special for coal mining, its NOT FACTORY. But it does sound like yer describing two differnt and popular dealer installed auxillary transmissions to go with the NAA 4-speed tranny and probably to slow the tractor down while negoating the narrow shafts bulling coal carts. The front shifter over yer left toe is commonly refered to as a "Sherman". It may be the more common and popular 3-speed aux tranny with a "crooked dog-leg" shifter lever. ...or... it could be a more rare 2-speed underdrive aux tranny with a simple "L" lever shifter. Foward for slow speed and aft for faster speed. There is a middle "neutral". Sounds like the lefthand 6" round PTO shifter plate under yer left heel has the shifter lever for the weak and fragle "Howard" after-tranny gearbox. Desirable for slowing the tractor down so you can use a "rototiller". Also know as "Rotory Hoe" from England. It is eather in "hi" or "low" and I don't remember a neutral. It was NOT DESIGNED TO PULL STUMPS. Many have failed because of "overload". May I invite you to repost your NAA tranny problems as you've explained them OVER ON the N-Board. We specialize in NAA's and other OLD Ford tractors. And would love to try and help you get yer ol'Jubbie runnin' good..... ...respectfully, Dell (WA), N-Board
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