T-Maxx Tranny work

[53Guy]

So I've been poking around and found quite a few options with the T-maxx tranny and 90% of them say to just the get forward only shaft to deal with the clutches on the output shaft. Being the cheap bastard that I am, I figured I'd destroy the ones I have before I buy something else. So here's a mod for you cheap guys out there like me who want to lock their t-maxx tranny in 1st the cheap way.

You'll need JB weld, 8 screws (I used the servo screws that I had laying around), and a few dremel disc's, and a small drill bit to drill pilot holes for your screws.

Take your tranny appart and pull the secondary shaft (the one with 1st, 2nd, and rev on it)

Torn appart it looks like this (I have noticed that the rev gear comes in two styles, one with a pin like the hubs do and another that is pictured that uses driveshaft pins that screw in)




You won't be needing the clutch gear (2nd) so you can ditch that entirely. On one of the trannies, I saved the bearing for a spacer, but it turned out that you don't need it. Also, to save weight, grind down the rev gear so that it's just a round nub. You'll need that portion because that is what locks the 1st gear onto the secondary shaft. With that done, it's time to drill the holes. Drill the holes with the gears on the shaft to keep them aligned. When you're done, it should look like this.





Be careful when tightening down the screws, too tight will deform the gear.

Now onto the case. Take out the selector shaft and throw it away. Take the rev gear and get rid of it. I put the screw back in the tranny case to plug up the hole, but I'm sure there are other ways of doing it as well.

Should look like this now.



Next it's onto the output shaft. Again, grind down the rev gear to get rid of the weight. Take appart the clutch before you grind it down as well, you won't need those any more. You NEED the REV gear as a spacer, so keep that and reinstall it on final assembly. Take the forward gear and take the clutch out to get rid of the weight also. Take the selector gear and pretty much cut the half off that you won't need (the rev side) to save weight here as well. The goal is to reduce the rotational mass so that the JB weld doesn't make the tranny a huge brick. Drill the holes in the forward gear with the selector gear on the shaft. You will need to keep the selector because that is what actually spins the shaft. Without it, the gears will just freewheel. You take the clutch out of the forward gear to reduce the slop as well as providing room for the screws to lock it to get rid of the slop. Should look like these picts now.







You probably could cut the forward side of the selector gear off as well, but I decided to leave it to prevent the JB weld from coming out, so if you're not using JB weld, I'd just get rid of that side as well.

Now the tranny is locked in 1st gear with no slop. To JB weld or not to JB weld. It's really up to you. You might not need it for your application, but I chose to use it to eliminate the possibility of the screws coming out and causing problems down the road. It adds some weight, but I think that its worth it. To each his own, so its up to you.

Pretty much put JB weld between the gears you screwed together and that shoud be good enough. I also put some where the rev gear on the secondary shaft splines into the 1st/2nd gear cluster to lock it there. Just be careful and watch the JB Weld as its drying so that it doesn't run onto the gear teeth. If it does, pretty much buy new gears because it'll be a pain cleaning them up if it hardens before you catch it. Don't worry about getting any in the bearings as it wont hurt them because you want the to be locked anyways.





So there you have it, the cheap and easy way to lock your T-maxx tranny in 1st to be used with electric motors.

[mxracer525]

nice little right up, now keep it going and do a write up on mounting an electric motor on it.:-P

[53Guy]

Originally Posted by mxracer525

nice little right up, now keep it going and do a write up on mounting an electric motor on it.:-P

Working on it, have to get the GD600 first! I'm going to do two styles, one with the GD600 and one without. I have two trannies, my wifes and mine, so we'll see how it turns out.

[mxracer525]

thats exactly wat i was going to say! show one with gd600 and one without, maybe even make it so the motor is as low to the tranny as possible to keep the COG down, or turn the tranny sideways and lay it down. theres all kinds of possiblilites, cant wait to see em.