2 or 3 speed aux transmission?

[riotwarrior]

I'm just curious if there is a small 2 or 3 speed transmission that one can mount the secondary CVT onto then an output to my Hagen or Rooters transmission???

Looking for some uber low gearing with option of stock or slightly higher than stock gearing...just playing with options...in my head right now for when my diesel engine goes in

[greg pinson]

Look at either a Polaris atv transmission or an aftermarket Harley Davidson transmission.

My father-in-laws Polaris Scramble tranny cracked and had to be replaced and I realized it is a stand alone transmission instead of being molded in with the engine like other motorcycles and atv's. It is only forward and reverse, no low range, but the other Polaris machines with high and low range might be stand alone transmissions like this one.

Harley's have stand alone transmissions also, but you would want an aftermarket transmission to be able to afford it. 1st gear is 3 to 1 or 3.25 to 1 depending on the model. High gear can either be direct or maybe a .85 or so overdrive.

[gearhead1937]

Seen this DIY gearbox floating around some time back... Looks pretty straight forward to build, and just what we all need... more chains and sprockets.

Widdershins Way - DIY Gearbox

[Nubs]

Yep

All the 90's Polaris 4X4s were Hi/Lo divorced transmissions, plenty of used ones out there for a few hundy.

[LarryW]

There was an enduro motorcycle in the 70's that had two rear sprockets. I think it was bultaco. But on road you put the chain on the smaller one. Off road you use the larger one. I only read and saw picture of it but I believe it only had one front sprocket. Kinda of cumbersome but works.

[greg pinson]

Yep

All the 90's Polaris 4X4s were Hi/Lo divorced transmissions, plenty of used ones out there for a few hundy.

I didn't know that, but if so, we may have just solved the 'low range' problem of the Max and other T20 machines. Another nice feature, at least to me, is that you could leave the T20 in forward gear all the time and use the auxiliary trans for reverse. No more having to pull the sticks backward to back up (that always annoyed me) If top gear gave you about 20 mph, low was 2 to 1, imagine how much power that machine would have geared down to 10 mph!

[riotwarrior]

I didn't know that, but if so, we may have just solved the 'low range' problem of the Max and other T20 machines. Another nice feature, at least to me, is that you could leave the T20 in forward gear all the time and use the auxiliary trans for reverse. No more having to pull the sticks backward to back up (that always annoyed me) If top gear gave you about 20 mph, low was 2 to 1, imagine how much power that machine would have geared down to 10 mph!

My thoughts exactly to have a fire road gear cause there is lots of that around here where I'm at and a uber low for when needed. I need just a forward geared unit no need for reverse, as my transmission functions much differently than the T20's most of you use. I've considered a T20 but I like what I have and it works well.

[LarryW]

There was someone way back that put a 3 speed trans/gearbox in a maxIV or it may have been a rim. Im going to try to find it again if I can.

[LarryW]

ok found it, lol. I was thinking Gus Marrone but wasnt possitive and it is. I havent found any details and cant find a shot of the setup.

[riotwarrior]

ok found it, lol. I was thinking Gus Marrone but wasnt possitive and it is. I havent found any details and cant find a shot of the setup.

Thanks for looking at least, I've just been toying with the idea between a under/direct/over drive setup if at all possible..I just don't know LOL

With the addition of the diesel engine, I'd like to think it would suite the setup well.

Larry I also posted about belt length and percentage of gear change in this forum do you have any suggestions???

Thanks again

[riotwarrior]

Been looking and so far nothing in my area is available.

I'd surely like to find a nice small stand alone range box DOH!

[ARGOJIM]

Check Hydromike's thread on Newthebold build.

[riotwarrior]

Check Hydromike's thread on Newthebold build.

read the thread, interesting build...checked out pics. That's similar to what I want to do but 203 box I have is destined for my 1 ton truck! 203/205 doubler!

I'm thinking more along the lines of similar box but aluminum, maybe I can find something in a off shore brand truck..hmmm...that's an idea.!

Thanks for the tip!

[riotwarrior]

Of course, leave it to a four wheeler to come up with this



Now wants to sell it...WTF thats in essense a planetary 2.72:1 reduction box built onto a Dana20 transfer case.

Hmm...lets see how many left nut$$$$$ one has to donate for that!

[hydromike]

The NP203 range box itself weighs in at about 100 pounds or so, and it's best suited to a machine where you don't give a darn about weight (like the 'Newt. ) I really spent some time looking for a smaller, light(er)weight range box or transmission to use, but just gave up when MaxIVMark gave me this freebee. The downfall(s) with it are certainly the weight, and that it yields a measly 2:1 reduction in low range. The high side is that I should be able to throw about 500hp at it.


This thread was finally a good reason to get off my lazy butt and post some pictures I took earlier this fall of a REALLY cool little range box I came across at work. It's a simple in-out reduction box that's used on a small Diedrich drill rig we had on a project. The rig was powered by a flat 18hp Kohler, and the reduction box was coupled between the engine and the right angle drive on the drill. Below are a few pictures of the unit. I couldn't find any model number or actual reduction of the box in low range, but the driller estimated that it was between 3 and 4:1. It's a cast iron case and I'd wager it weighed about 50-75 pounds or so. I looked around online to see if I could find something comparable, but gave up after a short bit (or likely got distracted by a shiny object....)





If anybody is familiar with these units, I'd LOVE to get my hands on one.