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Old 02-07-2007, 12:16 AM   #1
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Arrow Tranny Guide

Well I thought I would put a guide together to try and make the tranny options available to crawlers more centralized, organized and informative.

If I have made any obvious mistakes or omissions, please let me know so that I can make this guide as informative, complete, and helpful as possible.

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Up first is the venerable Stampede tranny from Traxxas.

The "Pede" as it is commonly known, is a 3 gear tranny design w/ a planetary diff design and a slipper clutch.

The Pede's internal gear ratio is 2.72 to 1.


Pro: Availability, reliability, ease of drive shaft installation.

Con: Physical size, weight, poor slipper design, plastic motor plate.

Diff can be locked several ways w/ JB weld and by relocating one of the planetary gears between the other two being popular.

Traxxas has released the XVL line of the Stampede-Rustler-Bandit. Powered by brusless motors, Traxxas upgraded the standard tranny gears w/ steel replacment gears.

Updated Traxxxas part #'s.

Top gear: 3195
Idler gear: 3969
Diff gear: 2388X




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Next up is the Evader tranny from Duratrax.

The Evader is also a 3 gear tranny w/ a ball diff design and slipper clutch.

The Evaders internal gear ratio ranges from 3.52 to 4.88 to 1 depending on whether is comes from a buggy or a truck.

Pro: Size, weight, durability, parts availability.

Con: Not available as a stand alone unit unless purchased from e-bay or other outlet. Drive shaft mounting not a direct bolt up affair.

The Evader diff can be locked by removing the balls from the diff, inserting abrasive paper disks between the diff gear and the diff rings w/ the abrasive side facing toward the gear and then tightening the diff extremely tight. It can also be locked w/ JB Weld or other adhesives.


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The Pro SE tranny from Team Losi is another option not commonly seen in crawling.

It us a 3 gear design w/ a ball diff and slipper clutch.

The XX's internal gear ratio ranges from 2.19 to 1 for the buggy version to 2.61 to 1 for the truck version.

Pro: Size, Weight, Durability

Con: Not available as a stand alone unit unless purchased from e-bay or other outlet. Drive shaft mounting not a direct bolt up affair. Parts availability.

The Losi XX trannies diff can be locked by removing the balls from the diff, inserting abrasive paper disks between the diff gear and the diff rings w/ the abrasive side facing toward the gear and then tightening the diff extremly tight. It can also be locked w/ JB Weld or other types of adhesives.









__________________________________________________ ________________________________


Another option is the XXX tranny from Team Losi.

It also is a 3 gear design w/ a ball diff and slipper clutch.

The XXX trannies internal gear ratio ranges from 2.43 for the XXXT version to 2.56 for the Matt Francis version.

Pro: Size, Weight, Durability

Con: Not available as a stand alone unit unless purchased from e-bay or other outlet. Drive shaft mounting not a direct bolt up affair.


The Losi XXX trannies diff can be locked by removing the balls from the diff, inserting abrasive paper disks between the diff gear and the diff rings w/ the abrasive side facing toward the gear and then tightening the diff extremly tight. It can also be locked w/ JB Weld or other types of adhesives.



__________________________________________________ _____________

Next in line is the Sportwerks Raven ST tranny.

It is a 3 gear design w/ a spider gear diff and slipper clutch.

The Raven St's internal gear ratio is 2.4 to 1.

Pro: Size, weight, ability to lock diff similarly to Stampede.

Con: Not available as a stand alone unit unless purchased from e-bay or other outlet. Part s availability may be an issue, drive shaft mounting not a direct bolt up affair.

The Raven ST's diff can be locked several ways w/ JB weld and by relocating one of the planetary gears between the other two being popular.



__________________________________________________ _______________

Another rarely seen tranny is the Ultima ST tranny from Kyosho

Again it follows the 3 gear design philosophy w/ a ball diff and slipper clutch as standard.

The internal rear ratio of the Ultima St tranny is 2.53 to 1.

Pro: Size, Weight, Durability

Con: Parts availability, Not available as a stand alone unit unless purchased from e-bay or other outlet. Drive shaft mounting not a direct bolt up affair.


The Ultima St's diff can be locked by removing the balls from the diff, inserting abrasive paper disks between the diff gear and the diff rings w/ the abrasive side facing toward the gear and then tightening the diff extremly tight. It can also be locked w/ JB Weld or other types of adhesives.



__________________________________________________ _______________


Lastly in the 3 gear tranny department is of course the Stealth tranny series from Associated Electronics.

IMO, the best trannies ever make for RC use.

There have been 4 generations of the Stealth tranny.

The Gen 1 Stealth was released in 1991 and is the basis for all modern tranny designs used to this day.

It has a 3 gear design w/ a ball diff and the first true slipper clutch. It's internal gear ratio was 2.25 to 1.



RPM offers a update kit for the Gen 1 Stealth that includes new cases and the top gear shaft that lowers the internal gear ratio to 2.65 to 1.

This upgrade keeps the Gen 1 Stealth as a viable tranny option to this day!



The Gen 2 & 3 Stealth B3/T3 tranny were similar in design to the Gen 1 Stealth.

They too were 3 gear designs, ball diffs w/ slipper clutch and a slight case re-design.

The B3/T3 has an internal gear ratio of 2.4 to 1.







The 4th Generation of the Stealth is the B4/T4. Once again improvements were made to the design. Again it is a 3 gear, ball diff design w/ a new slipper clutch design borrowed from Associated Nitro truck.

The B4/T4's internal gear ratio is 2.6 to 1.

Pro: Size, Weight, Reliability second to NONE, quality, parts availability.

Con: Not available as a stand alone unit unless purchased from e-bay or other outlet. Drive shaft mounting not a direct bolt up affair.







All 4 Generations of the Stealth tranny diff can be locked by removing the balls from the diff, inserting abrasive paper disks between the diff gear and the diff rings w/ the abrasive side facing toward the gear and then tightening the diff extremly tight. It can also be locked w/ JB Weld or other types of adhesives.

__________________________________________________ _______________

Now for something different. This tranny was designed specifically for crawling applications.

The R2 Crawler Transmission from RC4WD.

The R2 internal gear ratios of 10:1 to 30:1 is extremly low.

It has a 5mm output shaft, it is designed to work with Tamiya TLT-1 axle. It also offers multiple mounting applications for a variety of different chassis and platforms.

Pro: Compact size, low center of gravity, ease of drive shaft installation, no diff to lock

Con: Noise (32 pitch gears), cost, availability.

There is no diff to be locked on the R2!





__________________________________________________ _______________


I'm still looking for a good XX tranny shot.
__________________________________________________ _______________

Last edited by dezfan; 07-09-2007 at 10:48 AM.
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Old 02-07-2007, 04:22 AM   #2
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what about the R2
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Old 02-07-2007, 07:06 AM   #3
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isn't the stampede 2.72:1 ??

....also there are the Team Losi XX series trannies. They were available in 2.19:1 and a 2.61:1 ratio. Buggy/truck.

also RPM made a 2.65:1 conversion for the early Stealth/XX trannies.
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Old 02-07-2007, 10:34 AM   #4
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Quote:
Originally Posted by yukon635
what about the R2
It's coming!



Quote:
Originally Posted by sicj
isn't the stampede 2.72:1 ??....also there are the Team Losi XX series trannies. They were available in 2.19:1 and a 2.61:1 ratio. Buggy/truck.

also RPM made a 2.65:1 conversion for the early Stealth/XX trannies.
I'd double check the info on the Pede, and thanks for the XX info, I'll add it to the list.

Last edited by dezfan; 02-07-2007 at 10:39 AM.
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Old 02-07-2007, 11:07 AM   #5
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From that picture you posted in the general scale section, looks like the Sportswerks tranny uses a spider gear diff, not a planetary like the pede.
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Old 02-07-2007, 11:36 AM   #6
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Quote:
Originally Posted by K_Willis
From that picture you posted in the general scale section, looks like the Sportswerks tranny uses a spider gear diff, not a planetary like the pede.
Thanks, the correction will be make!
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Old 02-07-2007, 01:25 PM   #7
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what size spur gear and pinion are you guy's running with the stealth or losi tranmissions, thanks for tips and info.
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Old 02-07-2007, 01:28 PM   #8
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Quote:
Originally Posted by shrek
what size spur gear and pinion are you guy's running with the stealth or losi tranmissions, thanks for tips and info.
I'm using a 87/14 combination.
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Old 02-07-2007, 01:40 PM   #9
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Get this all filled in with the correct info, and some pictures would be nice as well, then I'll make it into a tech article for the mainpage so it doesn't get lost ;)
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Old 02-07-2007, 01:42 PM   #10
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I didn't know you were that into trannys Dez
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Old 02-07-2007, 02:42 PM   #11
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Quote:
Originally Posted by Link
I didn't know you were that into trannys Dez
Come on now, I run w/ BD and Rizzo!

Thanks Jason, I'm working on the pics!

Last edited by dezfan; 02-07-2007 at 02:56 PM.
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Old 02-07-2007, 03:13 PM   #12
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Quote:
Originally Posted by dezfan
Come on now, I run w/ BD and Rizzo!

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Old 02-07-2007, 03:22 PM   #13
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Quote:
Originally Posted by Link
I didn't know you were that into trannys Dez
Oh man that's funny :-P.

Question for you guys. If you had your choice & money wasn't a factor on a new build, what would you go with?

Initially I figured I'd go with the pede as it's so commonly used, but the more I think about it, the R2 seems like the better choice, purpose built item for crawling and is only ~$35 more than a new pede tranny. Am I on the right track?
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Old 02-07-2007, 03:39 PM   #14
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I'd still run a B4 Stealth.
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Old 02-07-2007, 04:56 PM   #15
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thanks dez. thats what i was looking for.
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Old 02-07-2007, 05:00 PM   #16
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Quote:
Originally Posted by dezfan
Come on now, I run w/ BD and Rizzo!

Thanks Jason, I'm working on the pics!
Come on slacker, get them pics up. I didn't go through all that work for nothing.
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Old 02-07-2007, 05:05 PM   #17
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I gotta pic of a stealth with maxx shafts and a lathe in it! If you want! out of the rig!

Last edited by TLTCrawlin; 02-07-2007 at 05:08 PM.
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Old 02-07-2007, 05:28 PM   #18
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great write up dez, very helpful for all of us.
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Old 02-07-2007, 05:37 PM   #19
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Quote:
Originally Posted by Unimoger
great write up dez, very helpful for all of us.
Definatly!
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Old 02-07-2007, 06:00 PM   #20
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Lookin' better with the pics. Too bad some of them had to be so small.
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