F-20 overdrive woes (long)

n9lhm

Member
So along with the lift-all conversion on my F-20, I wanted to add an overdrive so that I could get to around 15 MPH in road gear to be able to get to events quicker and do high speed tractor drives. I already have the factory road gear in the tranmission that will do around 10 MPH. The advice I got was I should get the Hiesler two-speed gearbox as that would give two speeds in each gear, and would fit along with the lift-all pump. So I found one at a price I could afford and drove three hours each way to get it. Got it home and it won't fit, there's no way it will coexist with the lift-all pump as the lift-all comes up each side of the clutch output yoke.

So, if I want an overdrive, it looks like it will have to be the Behlen that bypasses the transmission and direct drives the output shaft. So before I go to that trouble, who can tell me how fast the Behlen box will make the tractor go with 36" tires? I already have the stock road gear which goes around 10 MPH. If the Behlen will only go 10MPH then there's no point in getting one as that's no improvement over what I already have. So who has one that can tell me for sure how fast it will go?

Thanks, Brian
 
The Behlen road gear will multiply the 10 mph speed, that you already have. I'm certain someone will post the exact speed. You'll be happy to know that it will go must faster than your F20 is safe to drive.
 
The behlen will fit with the hydraulic pump, says so in their ad of the time, but a Heisler won't. The speed with 36 inch tires should be around 15-17mph . My F-20 with 13.6-36 does about 13mph with the factory high speed 4th gear. If you put that Heisler box on with the factory hi speed 4th you can get around 30mph with 36" rears but not highly recommended , it will feel like 100mph. The Behlen ad say speed comparable to Letter series, H, M .
 
The Behlen box does not multiply the existing road gear. It totally bypasses the transmission and drives the output shaft directly from the clutch output. Its gear ratio will determine what the road speed is -- that's why I want to know that before I spend the money on one.
 
I stand corrected. Was thinking that you shifted to high gear, before engaging the road gear, but if you shift to neutral, instead, before engaging the road gear, then you are correct.
 
I have an f-20 with a Benett & son, road gear. Similar to a behlen. I don't know how fast it goes but you can't keep a hat on your head!
 

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