Gears And Gear Reduction Question?
Posted January 05, 2014 - 11:51 AM
- Clippnalawn and Dieselcubmike have said thanks
Posted January 05, 2014 - 12:03 PM
I'm not sure on tractors, but on cars years ago the overdrive gave you slightly more turns out of the box than came in. My friends Chevy would tach(rpms) at about 3000 at 60 mph in 4th gear. When he engaged the overdrive, the car continued at 60 but the tach dropped to abour 2600 rpm. You were supposed to get better gas mileage in overdrive on good roads.
Gear reduction gives you more power at a slower speed. The machine moves forward at a slow rate but can pull a bigger load.
You need to define what your purpose and goal are to make a better decision as to what to do. Give us more info. Good Luck, Rick
- HDWildBill said thank you
Posted January 05, 2014 - 12:08 PM
- HDWildBill said thank you
Posted January 05, 2014 - 12:30 PM
Alrighty hopefully I can help. The purpose of an under driver to if you have big gears and don't want to tear the whole transmission apart to replace them. Then the obvious over driver is to speed up your gears. You speed your gears up by anything from a half a tooth, to a full 3 teeth faster. I believe cub had a 19 tooth for second gear which is a great starting point, and a 26 tooth for 3rd which is what the pro and super stock guys run. When getting into the sport of pulling its a no brainer to change the gears in your rear end. You want the best possible gears to match what your engine is capable of producing. But you have to factor in track conditions, performance, and if your running different sleds how heavy each sled is different. If you go on Midwest super cubs website there are plenty of gear ratios and charts on there.
- Clippnalawn and HDWildBill have said thanks
Posted January 05, 2014 - 01:11 PM
Posted January 05, 2014 - 09:16 PM
Posted January 06, 2014 - 12:46 AM
Swinny, there's really no high and low with these they arnt like sears or wheel horses. You have 3 pulling gears (4 if you don't have to use reverse) if you want more then you need to get a drop box for the front of the transmission which would essentially cut your gears in half. Ill post a link for you to see.
Clippn, yes these are all variables when it comes to pulling. Each track, sled, and weather all play a vital role in setting it up correctly to achieve the maximum grip without sacrificing power. Weight placement, tire pressure, tire circumference, spot on the track, weather, and how heavy the sled is all play an important part. But with everyone else that has said that im not able to release any of my information. I have over 17 years of pulling experience tied up in my brain that I had to learn on my own without anyones help. And to be honest that's the best way to learn because you can be given any type of information, but its how you use it. Nobody knows your tractor better than you will.
- Clippnalawn said thank you