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12-21-2009, 06:52 PM
| #1 |
| Quarry Creeper Join Date: Apr 2009 Location: columbus
Posts: 218
|  overdrive & underdrive gears... Why?
What's the benefit of having overdrive or underdrive gears in my Axial crawler?
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12-21-2009, 06:59 PM
| #2 |
| Newbie  Join Date: Nov 2007 Location: Your guess is as good as mine
Posts: 35
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With the front tires spinning faster than the rears while in 4x4 the rig will turn better and the rear axle will not want to drive under the chassis as bad.
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12-21-2009, 07:28 PM
| #3 |
| Rock Crawler Join Date: Jun 2009 Location: Middleburg
Posts: 536
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It also helps with torque twist.
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12-21-2009, 08:57 PM
| #4 |
| Rock Crawler Join Date: Dec 2008 Location: Appleton, Wi
Posts: 660
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They are awesome. Get the underdrives and never look back. Easily one of the best mods Ive done to my truck ever. Nuff said.  |
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12-22-2009, 09:00 AM
| #5 |
| Quarry Creeper Join Date: Jul 2008 Location: fremont
Posts: 265
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How badly will the faster spinning front wheels wear out tires? This sounds like a mod i want to do.
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12-22-2009, 09:26 AM
| #6 |
| I wanna be Dave Join Date: Aug 2008 Location: Austin, TX, USA
Posts: 4,273
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I think the increased tire wear is minimal at best. The rocks will hurt the tires more than the overdrive will. I think it's a great mod. My rig turns super tight, partly due to this mod.
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12-22-2009, 09:39 AM
| #7 |
| Pebble Pounder Join Date: Dec 2009 Location: Magalia, CA
Posts: 140
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who makes a good underdrive kit?
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12-22-2009, 09:54 AM
| #8 |
| Rock Stacker Join Date: Jan 2009 Location: oly
Posts: 86
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axial makes them
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12-22-2009, 10:56 AM
| #9 |
| Newbie Join Date: Nov 2009 Location: eastridge
Posts: 37
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This is a great mod. If you have enough wheel speed i would put the under drive in the rear, If not put the over drive in the front.
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12-22-2009, 11:39 AM
| #10 | ||
| No idea what I'm doing Join Date: Oct 2008 Location: Underground, CO
Posts: 4,529
| Quote:
Quote:
Like packman says, choose the ratio to best suit the speed of your crawler.....for example, my crawler was a bit slower than I would have liked, so I went with overdrive in the front. It's a great and cheap mod. | ||
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12-22-2009, 11:41 AM
| #11 |
| Shelf queen  Join Date: Aug 2008 Location: Internet
Posts: 5,857
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Hate to sound like a dick, but if you read the part description on the overdrive/underdrive gear sets, it tells you what it's benefits are...
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12-22-2009, 11:49 AM
| #12 | |
| Rock Crawler Join Date: Aug 2008 Location: Alamogordo
Posts: 774
| Quote:
SlashBasher, they are also more heavy duty than the stock gearset also. Nate | |
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12-22-2009, 12:48 PM
| #13 | |
| I wanna be Dave Join Date: Jan 2009 Location: By a lake in Thornton
Posts: 2,218
| Quote:
i know im gonna sond like a dick, but there is a search function too, that would bring up 1 if not all of the threads that address the specific question that has been asked a dozen times | |
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12-22-2009, 01:02 PM
| #14 | |
| Shelf queen Join Date: Aug 2008 Location: Internet
Posts: 5,857
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12-22-2009, 01:18 PM
| #15 |
| On the lookout for Rocks  Join Date: Mar 2006 Location: Monroe, Louisiana
Posts: 3,711
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12-22-2009, 05:29 PM
| #16 | ||
| No idea what I'm doing Join Date: Oct 2008 Location: Underground, CO
Posts: 4,529
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Quote:
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12-22-2009, 07:00 PM
| #17 |
| Rock Crawler Join Date: Nov 2009 Location: poteau
Posts: 996
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i already know i'm a moron when it comes to rc stuff, but how is the affects on the transfer case/transmission? i know that if this is done on a full size crawler, it will tear up the gears inside the transfer case in a very short time.
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12-22-2009, 07:05 PM
| #18 |
| RCC Addict Join Date: Nov 2006 Location: Lowell, Arkansas
Posts: 1,307
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Full size rig = 4000+ lbs for most. RC crawler = 6 lbs for most. Big difference. It doesn't tear anything up on a RC crawler. |
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10-15-2010, 12:48 PM
| #19 |
| Newbie Join Date: Aug 2010 Location: santa rosa
Posts: 13
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I have the stock 13/38 in the rear and decided to overdrive the front with the 14/36 gear, works great! I was a little worried that it would be a big difference and the back tires would skid a little since the front wheels are turning faster than the back but while crawling you don't notice anything except it pulls up vertical climbs way better now and seems a tad faster too! It also steers a little better as well. i would do this mod to ANY crawler!
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10-15-2010, 02:25 PM
| #20 |
| RCC Addict Join Date: Oct 2009 Location: San Francisco
Posts: 1,927
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I am running underdrives in the rear and talk about instant climb advantage! The main advantage I see with it is the fact that the front tires PULL the car up the rocks. Some guys go as extreme as Underdrive in the rear and Overdrive in the front. That is all well and cool except for when you go to back up since the car tends to "bunch up" on you. Then again we never reverse do we  Watch sites like RPP Hobby, they had the underdrive set on sale and I got one shipped to me for less than it retailed for (steal )
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