Rocky Mountain Underdrive/Overdrive - Defender Source
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  #1  
Old November 4th, 2004, 11:26 AM
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Brad Bradford
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Rocky Mountain Underdrive/Overdrive

I will tell you guys just like i did on the Pirate board and Discoweb. Ray Wood is very serious about developing an Overdrive/Underdrive unit for LT230s and series t-cases. He wanted me to spread the word to see if there is enough interest to make a couple of runs. He said the box would sell for around $2500 and would be completely bolt-on. I would be basically the same size as his Roverdrive units, so they will also fit on Discos, without cutting the floor out. If you are interested send me an email at WBDISCO@yahoo.com, i will relay the message to Ray. He is pretty excited about this, so you guys need to call him and keep him excited. I know a lot of people have been waiting for something like this, so here is your chance.

Brad
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  #2  
Old November 4th, 2004, 12:01 PM
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An underdrive as in lower lorange? Sounds cool but I just got my forward facing PTO to stick on the T-case so no use to me. $2500 seems like a big chunk of change though. Oh and you say Overdrive/Underdrive so does it do both? If so then it is well worth $2500.
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Old November 4th, 2004, 01:48 PM
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Brad - Do you know what percent over/under he would use? I'm interested in this also as a gear splitter so the percent change is important.
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Old November 4th, 2004, 01:59 PM
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Not at the moment. He is really just trying to figure if there will be enough orders for the run. I would think it would be similar to the Underdrive, and the overdrive gears would be the same as his DX Roverdrive.

I will keep you guys informed as things progress.

Brad
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Old November 4th, 2004, 04:09 PM
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Cool, thanks Brad!
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Old November 5th, 2004, 12:00 AM
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I am interested for sure, but at a little less than $2500
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Old November 5th, 2004, 09:38 AM
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remember, $2500 is ball park, so it could possibly be less but it all depends on how many he sells.

Brad
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  #8  
Old November 5th, 2004, 10:33 AM
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This would be an overdrive and an underdrive?? All in one unit? If so, I would be interested.


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Old November 5th, 2004, 01:30 PM
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yes both Underdrive and Overdrive in one bolt-on box.

Brad
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Old November 5th, 2004, 01:47 PM
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That sounds cool Brad.. Even cooler if it was about $1000 cheaper
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  #11  
Old November 5th, 2004, 02:50 PM
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Am I missing something here?

Doesn't Ashcroft offer underdrive gears for the LT230?

Who needs overdrive with a R380 or ZF? I have both and can readily hit very good highway speeds.
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Old November 5th, 2004, 03:41 PM
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Well, I think Maxi-Drive makes lower low range gears for the t-case I don't think Ashcroft makes the underdrive unit anymore. The benefit of having an over/underdrive is, you can lower the gears in you axles to lower then you need and still have a good top speed on road using the overdrive. What that does is give you basically a hi low range (od off hi range or od on low range), a mid low range (od off low range), and a low low range (ud on low range). Now this all may sound like a lot of choices, but it gives you a very good selection of speeds when off road for different conditions. If you have ever driven in a 90 with a underdrive it is a cool option, this would make a crazy option much like driving in a Unimog.


Edit: just thought of another thing, if you put bigger tires on your 90 it could take place of regearing you diffs depending on the underdrive and tire size
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  #13  
Old November 6th, 2004, 02:30 PM
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GKN overdrives are 1000 overhere so an over & underdrive for $2500 doesn't seem so bad if you type quickly
Still don't quite follow how over and underdrive all in one box works
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  #14  
Old November 9th, 2004, 11:56 AM
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I would love one if I could afford it - 20 gears.....mmmmm. Not sure how useful an overdrive would be as existing fifth is about 26mph per 1000 revs, but downhill or with no headwinds would be nice. Also I guess having to go in and out of low/high range on those short easy bits between the rough stuff off road. Can't he have it made cheap in China?
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  #15  
Old January 10th, 2005, 11:14 PM
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If this venture is still on, I'm interested.
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