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  #1  
Old 05-16-2016, 06:22 PM
MTM350 MTM350 is offline
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Default Overdrive gears

I have a few questions about overdrive gears for the Cub Cadet transmissions. First is how much of an overdrive can be installed before machining of the transmission casing is required, if any would be? If machining is required, does anyone have pictures or descriptions of what needs to be done? And last question would be how fast would the 47% overdrive gears be with 26" tires at 3600 and at 4000 rpm?

Thanks
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Old 05-16-2016, 07:07 PM
J-Mech J-Mech is offline
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Wow. You must be running a pretty big motor to want to go to 47% overdrive at just 3600 and 4K RPM's. That will speed up the trans by 8 gears.

No machining required.

Just for you, here is the link to MWSC's gear ratio chart. Go download it, or just access it and plug in the info you want. It will spit out all the info without having to do all those annoying calculations. There's even a "How to use it" video.

http://www.midwestsupercub.net/
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Old 05-16-2016, 08:38 PM
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dvogtvpe dvogtvpe is offline
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23% needs a little bit of work to get to fit. but it pretty easy. 47 needs allot of work in the reduction housing. all in the upper portion where the top gear goes. I think I have a housing that's clearenced for a 38%
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Old 05-16-2016, 09:00 PM
J-Mech J-Mech is offline
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Quote:
Originally Posted by dvogtvpe View Post
23% needs a little bit of work to get to fit. but it pretty easy. 47 needs allot of work in the reduction housing. all in the upper portion where the top gear goes. I think I have a housing that's clearenced for a 38%
Shoulda kept my mouth shut.... I thought they all would fit.
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Old 05-16-2016, 10:01 PM
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dvogtvpe dvogtvpe is offline
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there's allot of work involved to make the big OD's fit
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Old 05-17-2016, 04:15 PM
MTM350 MTM350 is offline
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So can the clearancing of the case be done with an angle grinder or a Dremel and lots of great care? Other than clearancing the case does anything else have to be modified? I'm asking for a friend who is building a gator type vehicle out of a Cub Cadet 1200 and needs it to go fast enough to make getting around his property easier and I figured this would be the best place to ask. Thanks
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Old 05-17-2016, 07:27 PM
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austin8214 austin8214 is offline
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Quote:
Originally Posted by MTM350 View Post
So can the clearancing of the case be done with an angle grinder or a Dremel and lots of great care? Other than clearancing the case does anything else have to be modified? I'm asking for a friend who is building a gator type vehicle out of a Cub Cadet 1200 and needs it to go fast enough to make getting around his property easier and I figured this would be the best place to ask. Thanks
You're going to lose a ton of power overdriving the transmission that much. Find out about how fast he needs to go and work backwards form there. MWSC has an excel file that you can plug tire circumference o.d. and gear into and it will give you an approximate ground speed.
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Old 05-18-2016, 04:12 PM
MTM350 MTM350 is offline
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He wants it to go 15-18 mph since he has a lot of land to cover. His has a creeper gear too so he will still have some low end power but it's not going to be tilling or anything. The power from the engine will be used mainly for moving the vehicle itself plus light loads like a hay bale or two and maybe a passenger.
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Old 05-18-2016, 04:44 PM
J-Mech J-Mech is offline
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He wants it to go 15-18 mph since he has a lot of land to cover. His has a creeper gear too so he will still have some low end power but it's not going to be tilling or anything. The power from the engine will be used mainly for moving the vehicle itself plus light loads like a hay bale or two and maybe a passenger.
There are vehicles out there for just this sort of thing. They are called ATVs. Go buy one.

I moved this to the general talk section. This isn't a pulling tractor.
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Old 05-18-2016, 04:56 PM
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One of the problems that I see with the overdrive gear set in this application is the inability to go slow when needed, 1st gear and reverse will still be a handful if your trying to maneuver a trailer or on uneven terrain. You won't be able to use it at an idle because the engine will likely stall with that tall of a gear and wot will be insane. This just sounds like a bad idea waiting to hurt somebody.
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