Well, that's crappy. When I modded mine, I used the two pins that came with the FOC for the intermediate shaft, and the two old pins for the input shaft (the older ones are a little weaker I think).

You might want to talk to your LHS to see if they might have something from a different vehicle that would work.

Or, how about taking a regular screw and dremeling off the threads on the lower part? You'd want to make sure there are enough threads left, but that would be a cheap alternative. Off the top of my head, I'm not sure what size you'd need for this, but probably 2mm.

I used a hardened pin, most likely one of the tamiya wheel pins. Held it in place with a grub screw from a pinion (set screw). A hardened roll pin would work too. Only issue would be to get it back out after the pin is pressed in. I hope it holds up!

Thats a good idea lincpimp. I'm gonna see if mcmaster carr has anything.

Ok...http://www.mcmaster.com/ carries all sorts of rods. I'm thinking either titanium or tungsten carbide. Not sure if my dremel will cut through tungsten though. Then I'll just use a set screw to hold it in place. Hows that sound?

Spent way too much time looking at rods, pins, screws on that site. Titanium and tungsten rods are not worth the money. They make many different steel rods in different strengths. Still not sure which one is right.

Hello,

I've read this thread all the way through and I'm planning to transform my tranny using option 4. One question though.

The FOC is already installed, so I'll need to use the motor for reverse. But on the other hand I'll be using the mechanical brakes.

Is there another (less destructive) alternative than option 4?

Thanks

Loa

Option 4 is the only way I know to lock into second. Using the FOC and locked in 2nd, I don't see any good way to use motor reverse, and mechanical brake. I suppose you'd need to use a 3rd channel on the TX for brake. Might be a bit cumbersome.

J.

I have also read this thread and I've got to say, it all seems too complex for most users. Does anyone (hint hint RCM) make a "kit" which includes the modified parts?

I don't have a Revo yet but I'm considering one. I think I'll use mechanical brakes because they are already there...is there some very simple way to lock it into 2nd if I don't want to use motor brakes? The Tekno site seems to suggest that there is a very simple way without tearing it all apart and grinding this and that.

One more bonus question for all you Revo wizards - is the revo really up to a brushless conversion? Is it strong enough? What breaks? What should be replaced before use? Anything that must be done to the tranny to keep it strong?

Thanks guys...

its actually easier to understand once you are working with the parts, and usually diffs are the weak points with RC cars, evrything else is up to the task, also changing to a high torque single steering servo is a plus

Like azjc said, it sounds more complicated than it really is. Once you get the tranny in-hand, it's much more clear. Option 4, while sort of "destructive", is reversible by just getting a new centrifugal clutch and putting it in.

As far as durability is concerned; it is pretty tough. The only other tranny mod to do is maybe use different pins that hold the gears to the shaft. The stock ones are kinda weak, but there are instructions in this thread as well.

Diffs are gonna be the next weakest link. But, a set of aluminum cups can be a fairly cheap way to extend their life. Or, get Mike's 8th scale diffs.

Another possible weak spot are the shafts, particularly the one going from the diffs to the wheels. Because they are subjected to a lot of torque, the ends may twist over time. A set of CVDs helps this, or turn down the torque setting a little in the ESC.

Thanks for the reply.

Does anyone make an already modded Centrifugal clutch?

One more, why do you suppose on the Techno web site it makes it sound SO simple - "...use the 2 speed or dial out 1st gear if you like (just loosen the shift point)"

I like the idea of removing unneeded tranny parts but I feel like the screws will negate any weight or rotating mass savings by removing 1st. If there is an easy way to do it without adding mass, I'm all for that.

Please advise and thanks, you and others like you are a real asset to this community and hobby.

DM

b0gh0s had a site (is down now) where he had a clutch replacement that did the locking, but since the site is down now, don't know if it's still available.

Don't forget, removing first also removes the OWB part, which is kinda heavy. And you are removing the clutch spring, ball bearing, and grub screw. Not to mention filing off the half-moon shapes. The screws do add weight, but is offset by a lot of what was removed. I think there still is a net loss, but cannot verify. At the very least, removing first gear removes a little drag from the OWB and simplifies things.

And this mod is "free"... always the best kind. :lol:

But, a machined clutch replacement would be nice. It would be just a matter of machining something that would fit where the clutch goes and have the pins (where the screws go in the mod) engage second gear.

Yeah...hint hint RC Monster Mike!

DM

I just locked my Revo into second gear tonight to use with my 8XL/MM combo and wow was it easy, took me under an hour to do. Great job with instructions on this thread Brian.

So I was never able to find a stronger pin to do the mod. What is everyone else doing?

I am using the pin from the Jato out drives. You just have to drill the hole a little bigger and it works perfectly. :yes:

This was the best solution for me: http://rc-monster.com/forum/showpost...3&postcount=59

I really like BrianG's method but I've held back because I hate to buy all those gears just to get the pins. Maybe I'll just wait and see if the stock pins break. My controller has a pretty soft start which should help them last.

BrianG, I just want to confirm the pin mod inside the tranny. I understand you are using 2 pins coming from each side. Now my question is...

Are you using the stock pins? And if you are not, what pins are you using?

Thanks

Yes, I'm using the stock pins. The FOC comes with two new black pins. Those seem to be harder so I use those where I am only using one pin. Since those black pins replace the stock ones, you then have two spares. Those are the ones I cut down.

I have what you guy's are looking for. A direct drop in, single speed conversion, that requires no mods to install. I had done the "bolt" trick in the past. However, recently someone on another forum asked if anyone made a single speed conversion. I did some reverse engineering, and came up with a plate that replaces the 2nd gear primary clutch. Again, it is a direct drop in, no mods required at all. I have about 30 of them left. Here is a pic; http://i91.photobucket.com/albums/k2...a/IMG_0162.jpg

excellent write up brian as per usual. will this work on a tekno conversion kit for the revo? you stipulated at some stage for use with the rcmonster motor mount... the tekno one will work with this also?

Sure. Everything that is done is inside the tranny so there is no difference externally. However, one of the main reasons for this mod is to utilize motor brake and reverse. The Tekno setup uses a clutchbell setup which makes the brake not work, so really, the only mod usable with the Tekno is the "pin mod".

Tekno you have to get longer bolts and use spacers between motor mount face plate and struts then get long shank pinion thats what i got to do didn't know it was made that way should have went RC Monster mount

On the pins LOL what is the FOC pins you talked about i will be modifing mine with the two threded ones on each side just wondering FOC or the best you found yet to use

FOC=Forward only conversion. The Revo has a reverse gear set stock, the FOC just eliminates the reverse parts (and removes a fair bit of weight too). The FOC kit comes with two of those pins, which are black. The stock pins are chrome and seem to not be quite as strong, but that is pure speculation.

now i feel like a idiot FOC couldnt figure out Conversion lol yea i think i will be back in mine to put better pins is going to be easy now that i looked at it will be locking it in 2nd also

Great info guy's. If I ever break the pins in my tranny I will definitely refer back to this.:great: