[AT] 8N Ford

[Ron Cook]

Behlen road gear was the most popular for the F-20 in these parts.  Of 
course being closer to the manufacturer probably affected the 
availability.  The Behlen I am familiar with is not an overdrive.  It is 
a road gear.  The main transmission must be in neutral before engaging 
the road gear.  Man, do things howl when you are traveling around 12-15 
mph on an F-20!!

There used to be a fair share of 9-speed H and M Farmalls around, too. 

Ron Cook
Salix, IA



drupert at seanet.com wrote:
>> Since I am still trying to stay off of my #$%& knee I am going to go
>> look at an 8N Ford Tuesday. Not been ran in a "couple of years". Has
>> very good rear rubber, Sherman hi-lo, pictures look pretty good, looks
>> like good old TSC super fading paint. Would not start, not stuck.
>> -
>> As I look at 9/2/8N's I have been struck by just how many of them have
>> the Sherman's in them. Most are just the step-up's especially in the
>> 9N's. I've seen mostly Hupps in the Fergies around here.
>> It is also amazing just how many of the N's have a mangled grill.
>> Maybe their brakes were not kept up good enough. :-)
>> I have seen a whole herd of F-20's with "road gears" Behlen I think.
>> Are there many other tractors where aftermarket overdrives were used?
>> I have often seen M&W gear sets for Farmall M series but they were to
>> improve 3rd and 4th gear but didn't change 5th.
>>
>> I don't know anything about the Behlen overdrive for the F series but I
>>     
> know Heisler made them.  They made two overdrives for the F-12 and two
> for the F-14.  One offering had a 2.1 to 1 ratio and the other a 2.32 to
> 1.
>
> They made three overdrives for the F-20, three for the Regular and one for
> the F-30.  For the Regular and F-20, one Overdrive offering had a 1.99 to
> 1 ratio, one had a 2.1 to 1 ratio and one had a 2.32 to 1 ratio.  The F-30
> Overdrive had the 1.99 to 1 ratio.
>
> The Data Book I have lists 4th Gear for the F-20 at 3.75 MPH ... I guess
> even with the fastest overdrive this means the top speed was barely eight
> and a half  MPH (probably want to have rubber tires for that).
>
> Heisler also made the 9-speed gear set for the H & M.  As with the M&W
> these gear sets offered four additional gears between the "standard" 4th
> and 5th gears.  This was accomplished by installing an overdrive on the
> Counter Rotating Shaft.  The overdrive ratio was appropxiamately 2 to 1. 
> Thus, when out of overdrive, the output of the first four gears was
> unchanged but when in overdrive their output was a hair more than doubled
> -for an M this meant the additional speeds of approxiametely 6, 7.5, 9 and
> 11 MPH.
>
> Dudley
> Snohomish, Washington>
>   
>