Drive cups for TGM-03 TNX

[ReaperGN 4]

I'm finishing putting a E-Maxx/Summit trans in my TNX and got the last major obstacle solved today. But while installing the rear dog bone I noticed that the drive cup on the diff has a lot of play. And after looking around the internet for a bit I've come to the conclusion that drive cups for a TNX are not exactly a common size. Are there any easy to get alternatives that fit the 6mm shaft with a 4mm pin and accept 8mm dog bones? I think o.g. HPI Savage ones might be a match but not exactly easy to find.

[acprc 1464]

I'm not aware of any different drive cups for the diff. You may be paving the way in that regard. The Facebook Tamiya Nitro Off-Road group has a lot of members that modify the TNX so you might get more specialist assistance there.

[guggles 269]

Are you talking about the drive cups on the differential or on the driveshaft?

Because if you are using the original TNX drive cups on the diff, then I dont know why the fit would be poor. 

If you need drive cups that accept a 8mm dogbone on the summit trans then I think the Traxxas 5153R would work, but dont hold me to it.

[ReaperGN 4]

The original cups on the diffs and trans are the same part. The power of a modern Brushless motor is way beyond what the cups were intended for so I'm after some made of better steel. But the 6mm shaft size is not popular. I will probably have to drill out some 5mm ones. 

 

 

[guggles 269]

I think the summit trans and diffs use 6mm shafts so their might be a Traxxas center cvd or aftermarket one that would fit your needs. I would look for people who have done this conversion before to see if there is an answer from them, like acprc said.

[ReaperGN 4]

Conversion is done. Trans is in, dogbones sourced and everything bolted together. The stock Tamiya cups are just overly soft.

 

Also there are very few documented conversions of the TNX and it's counterparts. Most use the stock trans with questionable mounting. Once I get some run time on this one I have a Terra Crusher that is going to be converted. Im not sure yet if I will be able to keep the Terra chassis or not. Using the Traxxas transmission kinda forces you into mounting the batteries up front unless you want to just lock it in one gear.