T Maxx Transmission ???

[Paxdad]

I have 2 T Maxx trucks (used) with the black transmision one is stock and the other has some aftermarket parts (chasis, engine Ofna Pico .21 Max, etc.) I have them both running but still working on getting them tuned accordingly. The question I have is are these a single speed or two speed? . I am assuming since they have a single spur gear they are single speed.

 

[Snook Man]

All Tmaxx black transmissions come stock with a 2 speed.
The gear change happens internally inside the transmission. It works on the same principal as an external double spur gear/clutch bell 2 speed, it is just inside the transmission.

There is a kit that can be installed to make it a single speed but it is not commonly used.
To check for a 2 speed just remove the rubber plug in the top of the tranny and look inside and turn the spur gear slowly. If you see a gear that has a hole in it for accessing the shift point it is a 2 speed.

 

[Paxdad]

What would cause the stock Maxx not to shift? I runs up nice but not shifting that you can even detect. Could it be the clutch? I am fighting with getting them tuned as well as the stock Maxx is running very rich/ cold. I am .75 out on the LS and 1.0 out on HS.
Maybe around 165 F. It will run for a while (no shifting as noted in first thread) and then die alomost like it runs out of fuel or loss of fire on the plug. Starts right back up. I was thinking that the return fuel line maybe the issue as it is a little long and runs up over the head.

 

[2revo1maxx]

Those needle settings are way too lean, no matter which engine it is!
[SIGN]Which engine is it?[/SIGN]

 

[Paxdad]

I know but would those lean of settings still run cold?? I am using a carb that was on a 2.5 4-Tec and would think that it is the same as the 2.5 in the Maxx.

---------- Post added at 9:19 PM ---------- Previous post was at 9:18 PM ----------

Sorry it is the Traxxas 2.5 engine.

 

[Metalhead Matt]

Carbs are the same on the 2.5, 2.5r and 3.3. You have to be lean. Never seen those numbers associated with carb settings. Are the needles smashed?

 

[Paxdad]

The needles could definately be messed up as it was a used purchase. I will check them out. The only difference in the carbs is that one has two orings on the base and the one I took off of the Nitro 4-Tec has only one. I am sure the one with the 2 orings is older version carb.

 

[2revo1maxx]

Carb issue for sure. You may wanna get a whole new one if the engine is any good.
BTW that missing o-ring should be still in the engine. There's only one traxxas composite slide carb.