*gear reduction unit

[cummingsman29]

Hey guys, just Want to see what everyone is running for a *gear reduction unit and at a good price!
Thanks!

[fhhhstix]

I use the Integy 4:1 and it requires no modification. It is about $40.

[Stepside]

Donny,

Go w/ a GD-600 if your looking to control cost.

http://cgi.ebay.com/Great-Planes-Ele...#ht_1245wt_741

Mount it to your motor, and and file the shaft down to accept a gear and you're set.

[Tamiya Cowboy]

You can also go with a 55 turn motor and a 6 tooth pnion for less money it comes out to be the same rpm's at the out put on the tranny in 1st gear as any 4 to 1 with a stock 550 can motor. Also RC4WD makes a 2 to 1 up to a 5 to 1 for the clodbuster I have taken this and mounted the motor backwards in my black tri axle they are all alum and cheep. With the GD600 you can also mount it on the out put of the tranny Idid that on my Hay Hauler this takes the stress of the load off the tranny by mounting it on the output.

[cummingsman29]

Thanks guys, I need 3 of them so just wanted to get some info on them the Pmd one I have in one of the trucks is good buy not 140.00 good.

[Tamiya Cowboy]

Originally Posted by cummingsman29

Thanks guys, I need 3 of them so just wanted to get some info on them the Pmd one I have in one of the trucks is good buy not 140.00 good.

LOL yeah the funny thing about them is you only buy one....One Time

[Tamiya Cowboy]

Donny here is a pick of what I was talking about with the clod gear reduction.

[tc1cat]

One thing not mentioned with the GD600 is that you have to either raise the tranny up by about .125" or lower your steering and shifting servos that amount or any combination of that. I have used both the GD600 and the Integy GRU. I like the metal case of the Integy but not the "noise" from it. Also the Integy is easier to mount than the GD600. Kind of a toss up as to which one is the best to me.

[Juganought]

Have you guys a link to the the elusive six tooth pinion? just cant find one

[Blueshirt]

Paul, do yu have a pick of that GRU from the front of the tranny you could post?

[SonoranWraith]

Originally Posted by Juganought

Have you guys a link to the the elusive six tooth pinion? just cant find one

RC4wd has 6, 7, 8 etc.

[Rogue]

Unless you are set on having more than a single speed, I use gearmotors like this one.

In my Wedico


And one in my Tamiya


Extremely small, powerful, and quiet. And cheap !!

[Juganought]

Extremely small, powerful, and quiet. And cheap !!

@ Rogue.....What motor is this, and specs?

Thanx

[Rogue]

Originally Posted by Juganought

Extremely small, powerful, and quiet. And cheap !!

@ Rogue.....What motor is this, and specs?

Thanx

Sorry, forgot to supply the link. Here you go
http://banebots.com/c/MP-28XXX-385

[ihbuilder]

Rick are you running the 20:1 ? I was thinking putting 1 in my merk since I robed the 3 speed out of it .

[Rogue]

Originally Posted by ihbuilder

Rick are you running the 20:1 ? I was thinking putting 1 in my merk since I robed the 3 speed out of it .

Yeppers !! Speed is something close to the same as a GD reduced 3 spd in 2nd gear.

I suppose you could figure it out mathematically to see what works best for you. I can't do it like that. I'm one of those "feel good" guys. If it feels good, go for it!! Trial and error is my best friend

[ihbuilder]

Thanks rick , yea I'll sit and do the math or do t&e depends on who of the 2 of me wakes up in the morn .

[Lil Giants]

Originally Posted by Espeefan

I'm a calculating kind of guy, so I did the math and went with a 5:1 reduction. I decided to run a Novak 540, 55 turn motor on this box, because I'm a power hungry guy! I ended up figuring out the Wedico final drive ratio in 3 gear, the stock Wedico motor RPMs, and the actual wheel speed. I found with the 5:1 ratio and the 55T motor on 12 volts, plus the 3:1 axle diff ratio, the speed would be almost identical to the stock Wedico trans in 3rd, with the Buhler motor. I expect no shortage of power, .....

I think your math is a bit out Nathan. :P

I find my trks have a good combo of both power & speed with dual Beuhlers, tam trans in 2nd and I have an additional 6.2 reduction within the twin motor coupler & tam transfer case. I forget exactly what the stock reduction is in 2nd with drive axles (17:1?)... total reduction is approx 105:1 with motors running around 5000rpm.

What rpm is the 55 turn 12v Novak motor?

[fhhhstix]

Joe we put 5 55turn motors on my dyno and they ranged from 4800-5900 rpm. Instead of running the dyno with a 12 power supply and regulating the dyno to 7.2v we ran the dyno with 2 of my good NiMH 7.2v batteries which give a better reading. We ran all 5 motors on one battery and then did it again with the other battery. The 12v power supply is fine to break in a motor but using a battery pack will give you a better reading of the motor this is how we used to do it for our race cars.

[Lil Giants]

The big grippers I'm running are a bit taller than the stock tams of 83mm and I use the 12 tooth plastic pinion, that comes with wdc motors, on the output shaft from the twin motor coupler into the tam trans... the final drive output is somewheres around 50 rpm at the drive axle... and you're talking having ten times that with your wdc? That seems pretty quick for a heavy haul tractor.

The white tractor in my vids is usually running around in 2nd. I rarely ever use 1st. And flip into 3rd running empty, which is a bit faster than walking.