Auxiliary transmission for Max T20

[greg pinson]

What about the power it would take to turn a full sized transfer case? Seems like that would drain alot of power out of a 20 hp motor. My wife has an Explorer, transfer case is pretty good sized in it. As of right now, the after market Harley transmission is beginning to look pretty good. At least I know it wouldn't take much power to turn it. Low gear is 2.9 to 3.2 to 1 depending on ratios chosen.

[mudbug3]

greg pinion


If you could find a harley transmission that was,nt too pricy, I,d think this might be your best choice because of the size. These transmissions are easy to buy through the harley after market, and the transmission output shaft sprocket can be bought in different numbers of teetth.

[brushcutter]

Greg, the 3 speed manual transmission that Ford put in their '66 Mustang had a removable bell housing and was a fairly compact unit. I went to check dimensions on it for you ,but after spending about a half hour looking for the one that belongs with my wife's '66, I have discovered that it is NOWHERE TO BE FOUND! Can you sayMAD!!!


The MIL had given a relative of theirs permission to haul off some scrap iron recently, and apparently they took it -along with the undercarriage and running gear for a struck mini loader that I wanted to keep!!! I already knew about the loader, but just now discovered that the 3 speed was gone also!

Anyhow, you may want to check out the transmission they used, I'm sure the Mustang wasn't the only of their cars they used it in.

DANG!!!!

[FREQ42]

How about an ATV HI/LOW T-case? EBay #200179876413

[greg pinson]

I thought about that, but it doesn't appear to be a "stand alone" box with an input and output shaft. If I we could find a little T20 sized or smaller, transfer case type gearbox, with a 1:1 high and 2:1 low, with an input shaft and output shaft, I'll bet several people on this forum will be interested. I haven't given up. Help me keep looking guys!

[FREQ42]

I think a Allis Chalmers b112 variable bevel gear box Ebay #220715649290 is the size your looking for?
After doing a search on small tractor net I found that this is not what they posted but a standard Bevel gear box, disregard sorry.

[greg pinson]

That is probably close, unfortunately, that appears to be a transaxle. So far, the only thing I have found that appears it might work is still the aftermarket Harley Davidson type, stand alone, motorcycle transmissions. I found an Ultima 5 speed motorcycle transmission for $529.95. I would assume it would hold up under a 20 horse Kohler turning a cvt transmission. Remember, I want to use the cvt that came with the max. I probably wouldn't even shift on the fly, I would probably pick a gear and drive it, if I needed a lower or higher gear I would stop and select it. Somewhat like you would on a sidexside or 4x4 atv. I'm still looking though. Monday I'm going to check with the Garden tractor pullers and see if they have something.

[FREQ42]

Why not build your one?
Take a look at this.http://www.thepixelpump.com/widdersh.../Gearbox-1.jpg
It's simple and you can make it any speed ratio you want.
I found it hear, Widdershins Way - DIY 2-speed Transmission
You can build one inside a box and give it an oil bath even. It would be a lot cheaper than a commercial unit.

I'm still looking for ya,

[brushcutter]

Now that would work... instead of driving TO the T-20 you would drive this FROM the T-20, and you could build it as small as the sprockets would allow!

[FREQ42]

Yup it's stupidly simple and it will work on ether end of the T20. you can even go with double roller chain and sprocket's to beef it up.
The problem with small tractor transmissions is that they almost never have a 1:1 ratio, I don't think one from a motorcycle will either but I can be wrong.

[brushcutter]

After thinking about this it would be better to drive TO the T-20, otherwise you would have to have one for each side... right?

[greg pinson]

FREQ42,That is really cool. Exceptionally simple. RI should look at this and put it in production. Harley Davidson type motorcycle transmissions are either 1:1 or a small overdrive around .87:1 in high. 1st gear is 2.94:1 or 3.24:1. I wonder how much it would cost to have a machine shop build this?

Brushcutter, you would have to still run it through the T20 for steering and braking.

[mudbug3]

Whipper would be the one to ask about building a 2-speed transmission like this one.

[amphibious drew]

I like the guys transmission, thoughts, and even execution. I'm left scratching my head as to why anyone would spend so much time on such a small and cheap go-cart.

[FREQ42]

FREQ42,That is really cool. Exceptionally simple. RI should look at this and put it in production. Harley Davidson type motorcycle transmissions are either 1:1 or a small overdrive around .87:1 in high. 1st gear is 2.94:1 or 3.24:1. I wonder how much it would cost to have a machine shop build this?

Brushcutter, you would have to still run it through the T20 for steering and braking.

Whipper would be the one to ask about building a 2-speed transmission like this one.

I like the guys transmission, thoughts, and even execution. I'm left scratching my head as to why anyone would spend so much time on such a small and cheap go-cart.

I'm not shore why they would spend that much time ether?
Yes this can be built by any one with simple tools.
It can even be built using the gears out of one of those parted out tyranny's on ebay by only using the shafts and a couple of the gears I would imagine.
Going back to the basics is what this guy did and it works, Hear we're thinking of this big complicated setup using different gearboxes and transfer-cases when alls we needed was to go back to the basics. I admit I to was not thinking about the basics ether for this project till I stumbled across this on a welders forum I belong to.
As for RI not using it in there production? Good Question,