Question: Axial Optional Ratio Gear Sets

[JS412]

has anyone used these gears, AX30401 and AX30402? How much of a difference does it make? I like the idea but am a little unsure about dropping $60 if the difference is minimum. Thanks in advance for the answers.

[TSK]

Running overdrive front and underdrive rear will result in tighter turning radiuses, but unless you compare it back to back with a stock truck, it wouldn't be a super noticable difference. The reduced toqrque twist is a plus, and that will aid in climbs.

Then aain, a scaler cannot be compared to a comp rig, so I wouldn't say it is a necessary updgrade. I would advise you to spend the money elsewhere.

[JS412]

thanks for the quick response, so with these gears the truck will pretty much be dragging in the rear wheels right? I take mine hiking a lot and the torque twist is very noticeable...

[NGreen]

Not always. If you do an underdrive/overdrive combo, ya, you'll either drag or push one of the axles. If you do both under or both over, you'll be just fine. I use them because they're a better quality gear it seems and helical cut gears just work way better than the stock gears. Stock gears also use an "E" clip to secure the pinion onto the input shaft, so getting these gears or the standard heavy duty gears is the way to go. The stock gears can have the "E" clip rip through the pinion metal causing the pinion to work off of the shaft...kinda sucks when you do it in the middle of a trail ride. Anyways....these are the underdrive gears...you can sorta see the helical cut pattern in them.



Heavy duty gears (not stock, but stock gear ratio)




BTW, underdrive 1:3.30, overdrive 1:2.57, so you can kinda see how much it'll be pushing/pulling.

[JS412]

i understand the benefit of helical gearing and thats one of the main reasons I am looking towards into these. if i do a underdrive and overdrive combo what would be the draw backs? excessive tire wear due to the difference in the gear ratio (0.73)?

Thanks for the reply really helps when I hear it from someone who actually runs it on their rig.

[TSK]

The problem with going both over or both under is that you defeat the torque twist reducing properties and increase crawl ability that the gear sets provide.

Your tires will scrub more due to the difference in roational speeds, but having your front wheels spin faster than your rears, you rig is less likely to flip on steeper climbs as the front tires work harder to pull the truck up as opposed to the raer trying to push it uphill (which leads to flipping)

If you simply want better gear mesh, then go with the standard HD geare set.

[JS412]

so pretty much with over/under combo I'll prob need to replace my rear tires sooner than my front, but I'll have a better chance on hill climbs (no more back flips).

[kaneohecrawler]

Not no more back flips.... less back flips. Tire wear will vary depending on terrian.

[WIDELOAD]

There has been a bucket load of threads on this subject.
This was the last one started and its got some good info in it:

over and under drive

[JS412]

yes correction "less" backflips

[NGreen]

Another option is to use the stock gear ratios in one of the axles (38/13 or 1:2.92) and then underdrive in the other....provides you with some difference, but will reduce tire wear if you're that concerned about it.

[JS412]

most trails i hike on are packed dirt or boulders so i dont think the surface will be that harsh on it. my concern is prob the average ~4mi i usually do.

[JS412]

talked to my hobby (addiction) dealer going to go with the 36/14 for the front for now.

[TSK]

Originally Posted by JS412

talked to my hobby (addiction) dealer going to go with the 36/14 for the front for now.

I normally just overdrive the front and keep stock gearing in the rear as the overdrive gear ratio difference is greater than the difference between the underdrive and stock.

[Gimp]

I ran under drive gears in the rear for a year, worked pretty well. I recently rebuilt my front end and went with the over drive front gears. The under AND over drive combination works really well. You have the ability to use more throttle without doing back flips, better turning radius, less slop, and the front pulls better. It's just all around better. Never had a tire wear issue, but I usually don't keep tires long enough to ever have an issue lol

[JS412]

nice! well the over and under gearing was what i wanted to do also it benefits from a better gear contact due to the surface area. always like helical more than spurs guess thats the ME in me. we'll see how the tires are after a few hikes

[Cableman]

what about these http://www.3racing-parts.com/shop/ax...-90006890.html
Same ratio as stock but helical cut. Any one know if there good?

[TSK]

Originally Posted by Cableman

what about these http://www.3racing-parts.com/shop/ax...-90006890.html
Same ratio as stock but helical cut. Any one know if there good?

3 racing actually makes some pretty decent stuff. But axial sells an HD gear set with the same ratio and the helical cut...

[Cableman]

Originally Posted by TheSCorpionKing

3 racing actually makes some pretty decent stuff. But axial sells an HD gear set with the same ratio and the helical cut...

I thought axials are only under and over drive in the heli cut and the hd standard gear set is not heli ??

[NGreen]

Originally Posted by Cableman

I thought axials are only under and over drive in the heli cut and the hd standard gear set is not heli ??

You are correct. See the pictures above.