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Old 05-01-2019, 09:07 AM   #1
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Default Trx4 sport with OD/UD GEARS

I’ve got about a 7.5lb trx4 sport with a HH 550 21 turn motor and 45/15t gears. I’m thinking about putting in OD/UD gears. Am I thinking right? Would this be a good setup. I mainly like crawling and am zero percent concerned about speed.
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Old 05-01-2019, 11:52 AM   #2
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Default Re: Trx4 sport with OD/UD GEARS

The OD/UD setup is a personal preference kind of thing. I don't see any need for this unless you are competing and for trail running it is not a good setup. Unless you have a specific need I would not waste the money. Also, to be honest, I would change your gearing to 45/9. Your 15t pinion is going to make the motor work harder and run hotter.

Last edited by Inspector86; 05-01-2019 at 01:22 PM.
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Old 05-01-2019, 12:19 PM   #3
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Default Re: Trx4 sport with OD/UD GEARS

10-4. I’m just trying to make this rig the best I can. I was kicking around picking up another rig, but decided I’m just going to stick with this one and max it out!
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Old 05-01-2019, 12:27 PM   #4
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Default Re: Trx4 sport with OD/UD GEARS

I would disagree. I'm a trail runner and I like OD/UD. It doesn't hurt with slow, straight driving, but it sure helps climbing! If you have a fast rig then you wouldn't want it, but otherwise I do it.

Heck, even some monster truck guys run OD and/or UD gears.
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Old 05-01-2019, 12:29 PM   #5
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Default Re: Trx4 sport with OD/UD GEARS

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Originally Posted by Inspector86 View Post
The OD/UD setup is a personal preference kind of thing. I don't see any need for this unless you are competing and for trail running it is not a good setup. Unless you have a specific need I would not waste the money.
It is a different driving style, basically you are dragging the back end of your rig, kind of like a dig set up that is always on. It allows for a bit tighter turn radios, and helps climbing in situations where the back wheels want to drive under the CG and flip the truck backwards.

If you are not competing, I wouldn't bother with it. I have tried it on other rigs and don't really like it, even for comps. But, its your rig, if having OD/UD on it puts a bigger grin of your face, then it is the right mod for you.
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Old 05-01-2019, 03:22 PM   #6
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Default Re: Trx4 sport with OD/UD GEARS

Comping or not, I prefer either UD rear or OD front gears, sometimes OD/UD together is a bit too much imo. Try UD rear gears only and see, that's how I run my SCX10. Definitely helps increase steering and climbing.

Last edited by Natedog; 08-13-2019 at 11:30 AM.
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Old 05-02-2019, 09:34 AM   #7
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Default Re: Trx4 sport with OD/UD GEARS

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Originally Posted by garage-boo View Post
10-4. I’m just trying to make this rig the best I can. I was kicking around picking up another rig, but decided I’m just going to stick with this one and max it out!
If you are going for a Max capable rig at the very least get underdrive.
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