FWIW - I wasn't attacking the use of a ball diff, I genuinely wanted to hear why.

When the absolute majority are using a spool up front or perhaps a really heavy gear diff I was curious to hear the reasoning.

Turns out it was completely arbitrary :lol:

I used the TRF416 one in my 418, I assume it will be the same in the 419 (I haven't used it in the 419 yet)

Indeed, needs must sometimes :) I just wanted to also stand up for the mighty ball diff, my 417 ones are still as smooth as butter (although they are not massively used).

I'm using a 417 one too and when I built it (and tightened it very hard) it was smooth as new. After a few runs tho it seems a little gritty but very consistent at least.

With the ball diff up front I felt I had way too much steering especially on corner entry. Which made the car difficult at the beginning because it would turn in so suddenly. Hence my chose of going back to a spool. I'll see what happens !

With the exception of our lipo/brushless tech, I think gear diffs are the best development in recent years :nod:

No more inconsistency during runs, no rebuilding and never getting it quite the same etc.
The gear diffs only leak if they're crap or built incorrectly. I bought a few gear diffs, some new and some second hand, each with a different oil in it. So no rebuilding necessary, almost ever :)

I also run 1/12 and have to rebuild the diffs for that a lot... and I hate it :nod:

+1 on the consistency. Ball diff, unless you make them too tight, they'll loosen during the run.
Biggest issue with ball diff is diff slip imo.

Hi Guys

Again and again problems with the 2.6 mm screw from the Drive Pulley. Already at my TRF 418, I had problems with the screws, I had to completely replace all motor mount and Drive Shaft ...

With luck and patience I was able to remove the screw.

Must get steel screws to have no longer problems :weird:

Had the same problem on the 418. Bought a bunch of the original screws and replaced with a new every time I needed to replace the spur or for maintenance. Never tightened too much.

I striped a titanium one the other day. Painful.

But was easy to undo via the lay shaft with the kit spanner.

The kit screw is steel.

Quick question guys. Is the 417 gear diff a drop in fit for the 419 and vice versa? Just want to know as I have a few spare 417 gear diffs. Thanks.

There only should be a little torque on that screw ...

if your bearings are free and correct that will not spin loose.

you guys are over tighten them....

I'm using a TRF419 geardiff in my TRF418 so i guess it shouldn't be a problem to use the TRF417 geardiff in your TRF419.

You'll probably need the narrow diff bearing holders/belt tensioners (TA05 type).

Since I had the Raceberry Conversation Kit for my TRF 417 V5, I hated the screws in the Drive Pulley and never attracted more than necessary, because I made already there my negative experience.

I had even then problems with the 2.6 mm screws, hoping for an improved system as the Smokem V7 set.

Can anyone recommend me a good screw, which can be turn out without any problems?

tentative 2mm 419 lower deck from Tamiya and what is that small piece next to it?

they kill hotlinks. scroll down.