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BrianG · **Transmission Conversion -** 02.07.2006, 11:15 PM

I posted the following at the Traxxas forums, but don't seem to be getting any responses, so I'll see if the good people here have any input:

I'm trying to figure out if it is possible to convert a Revo transmission for use with brushless motors. It might be easier to refer to the transmission exploded view (http://www.traxxas.com/products/nitr...evo_tranny.pdf) while I go through this.

The goal is to have a transmission that will do reverse via the motor, and not by using a shifting servo. To do this, I have to find a way to replace the three one-way bearings with something equivalent (2 x #5121 and 1 x #5393) so the tranny is locked both ways. This would also allow me to use the motor braking feature if I decide not to use a disc brake.

I believe I can replace the two roller bearings (#5121 6x10x8mm) on the output shaft with equivalent regular bearings. The output gear (#3982) would then roll freely on the output shaft, but since it is coupled to the dog gear, which drives the splined part of the shaft, it should work.

However the first speed gear (#5386) is coupled to a special roller bearing (#5393) that is attached to a hex adaptor of some sort. I don't think I can find something to replace that assembly. This isn't a big deal really since I don't need first gear. So, I could simply do away with that gear and special bearing and replace them with some bearings/shims as a spacer. I realize this would create a single speed tranny stuck in second gear all the time. If there is a way to replace this bearing with a non-one-way version, I could keep first gear, but I don't think that's possible.

So, if I remove first gear, I then have to find a way to lock the two-speed clutch (#5390) so it always engages the second speed gear (#5385), which is coupled to the primary gear (#5396) through the shaft.

I think I have the solution planned out, but was hoping for someone else to take a look to see if this sounds right. I'd hate to go through all this and realize I forgot something. :)

	(#19)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	Transmission Conversion - 02.07.2006, 11:15 PM I posted the following at the Traxxas forums, but don't seem to be getting any responses, so I'll see if the good people here have any input: I'm trying to figure out if it is possible to convert a Revo transmission for use with brushless motors. It might be easier to refer to the transmission exploded view (http://www.traxxas.com/products/nitr...evo_tranny.pdf) while I go through this. The goal is to have a transmission that will do reverse via the motor, and not by using a shifting servo. To do this, I have to find a way to replace the three one-way bearings with something equivalent (2 x #5121 and 1 x #5393) so the tranny is locked both ways. This would also allow me to use the motor braking feature if I decide not to use a disc brake. I believe I can replace the two roller bearings (#5121 6x10x8mm) on the output shaft with equivalent regular bearings. The output gear (#3982) would then roll freely on the output shaft, but since it is coupled to the dog gear, which drives the splined part of the shaft, it should work. However the first speed gear (#5386) is coupled to a special roller bearing (#5393) that is attached to a hex adaptor of some sort. I don't think I can find something to replace that assembly. This isn't a big deal really since I don't need first gear. So, I could simply do away with that gear and special bearing and replace them with some bearings/shims as a spacer. I realize this would create a single speed tranny stuck in second gear all the time. If there is a way to replace this bearing with a non-one-way version, I could keep first gear, but I don't think that's possible. So, if I remove first gear, I then have to find a way to lock the two-speed clutch (#5390) so it always engages the second speed gear (#5385), which is coupled to the primary gear (#5396) through the shaft. I think I have the solution planned out, but was hoping for someone else to take a look to see if this sounds right. I'd hate to go through all this and realize I forgot something. :)