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Jim, that Behlen overdrive unit was manufactured by the Behlen Mfg Co… That overdrive was not a factory option but was an aftermarket option.. It was probably originally installed after the original steel wheels were removed to give that “A” a faster road speed [probably just under 20 MPH in high gear. ~That Behlen unit was operated by putting the tractor's trans in neutral, then using the tractor’s hi-lo shifter in conjunction with the Behlen box shifter for either fifth or sixth gear. ~The trans has to basically come completely apart to install that Behlen unit as both transmission shafts need to be changed to longer shafts. ~I really can’t give you a price on a Behlen unit but have seen them go from about a low of $50.00 to well over $500.00.. I guess it depends on how bad you need one & where you look. ~As far as adding value to the tractor??.. It depends on the buyer.. Some people see it as a non original equipment piece & want to remove it as soon as possible & others like them as it does give a higher transport speed & is a little unusual.. ~If a person wants an original tractor they are usually removed.. ~Those darn overdrive units do stick out a ways behind the flywheel & can be hard on the knuckles when starting the tractor. ~If you look long enough you can find them at swap meets & tractor shows.. I saw one last year that was still un-installed & new in it’s original box [don’t remember the price though].. ~If you are looking for one be sure it has all the shafts & parts as those individual parts will be hard to find.. Most people don’t want to break a good unit apart & sell the pieces.. JDClooney@aol.com
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