Hello everybody,
first of all, I apologize in advance for the english mistakes in the following text. I am french, and I am not fluent in English...

I am finishing the build of a TRF419XR, but I have an issue with my front belt:

It seems to run too close to the blue servo mount, as well as to the center carbon stiffener.
Depending on the position of the belt on the center and front pulley, (there an approx. 2mm latteral play) the belt is sometimes in contact with both the stiffener and the servo mount.
The blue color on it already started to come of from just a 10 second wheel spin in the air, when I was testing the electronics.

Did you guys already experience this problem? Is it supposed to be fine like that on this car ? (Which I seriously doubt...) Or do you think I made mistake at one point during the build ? Can it come from a lack of tension on the belt ? ( Following the manual settling, the belt was feeling way to loose, so I already re-tensionned it a little bit. It feels totally OK right now. )

Thank you very much for your help !

LeSournois After reading your post I went to check my XR and lo and behold, my servo mount show signs of the belt rubbing. I agree it is because of how wide the front pulley is. I have part #42309 37T Aluminum One-Way Pulley that I have not installed - it is 1.3mm narrower than the stock front pulley. Perhaps that will solve this problem. I haven't installed it because I race USGT and want a lighter drivetrain. I'll keep an eye on it to see if it gets worse.

Got a 419X, and havent had any issues with the belt rubbing the servo mount, but it does look a bit too close. Might be because ive shimmed the center pulley

It rubs, you just have to live with it

.....

Hi all, Just 1 quick question, does the 419 rear diff same as the 417?

It’s the 418 diff, but the old white 417 one will fit

thank you all for the info. appreciate it..

This really help , because i have few 417 spare diff. thanks

The bulkhead distance should also be checked, in this case it is the same (I'm not sure if they changed through the iterations of the TRF417.

Below is what I gathered from the internet, for reference:
417 v5 22mm
419 24mm
419X / XR 22mm
420 20mm

If anyone based in the US is interested in a 419XR that just hit the marketplace:
Tamiya 419XR TCS Spec carpet build RTR