WD or WD45 2-speed range box

Hopefully the photo will follow this thread. This was my Winter project, a 2-speed range transmission located inside where the hand clutch and PTO gears used to be located. I set this one up as a 15% under-drive. This places low 3rd and low 2nd half-way in-between normal direct drive speeds. Essentially, it makes the tractor 8-speeds, four direct-drive and four under-drive. It could be made into an over-drive if desired. Totally enclosed and nothing exposed. I'd be interested in making more if there's a market. While still a prototype, this one has been down the track four times already with no issues whatsoever. While not cheap to build, there's no more compromising on speed selections with this accessory.

That's pretty cool, how does it work?

Interesting.

Exactly, and the ratios could be chosen to almost whatever you want.

Now you just need to add a shifter groove to that top gear, a detent system to do away with the sleeve and figure out a shifting fork that is "out of the way" 

The way I see it, you've designed a transmission system that will work in a wide range of engines from 50 HP on up. 1st gear with the gear box in under drive should still work with a pretty much stock engine with 38 inch tires. Big power engines have a gear between every gear. Pretty neat.   

Almost a semi-load of corn installed and turn-key in your existing torque housing. That's one of the issues....I have to have a torque housing with the clutch shaft AND the transmissions input shaft.

The picture wasn't quite the finished product, and yes, there is a plate that bolts to the top to keep the rear bearing support from moving around. I'll probably got to Gr8 studs with flange nuts instead of just bolts.

Could you use splined hubs like my gearboxes use, then use Profab or SCS gears to lower the price of gears? Or are your shaft centers too close togather?     MACK

DrAllis and company...
That is pretty neat thinking there! Wow!
Will you be at Sigourney on Saturday to test it there?
Pastor Mike

Dr Allis,
I would be interested in something like that. How much would the cost be of the exact type? 15 percent underdrive.

Just an update on this two-speed transmission. All of 2016 season and thus far in 2017, there have been 29 hooks made with this tractor.    27 of them were in 15% under-drive and 3 were in direct drive.  Thus far, no issues whatsoever.  The 15% under works out quite well in 3.5 to 4.0 MPH classes in second gear..

Hydraulic pump, PTO gears and hand clutch removed to make room. Gears and countershaft custom made for the project.

Not interested in making another one. I've sold the tractor that had that 2-speed in it. If you install a D-17 ring and pinion or use a WD45 diesel rear end, they are geared 15% slower. That 433-T engine peaks torque at 1700 RPM and a WD45 diesel ran 1900 RPM high idle. I think you'd like the 15% reduction.