Tamiya do sell direct mount servo horns (42248/42249) that would be fully legal. Personally I use the High Torque Servo Saver with a strategically placed drop of CA glue, rock solid during normal use.. but it will break loose on a big hit and still do its job..

Good call on the Tamiya servo horn, thanks, didn't see that previously.

I have their 54752 package and that servo saver is the wild POS that failed after a few laps.......but I also did not put any glue on it.

While I'm not sure if I will do a TCS this year as right now I am struggling locally still, but the car is getting "better" and who knows in a couple weeks of racing I can feel confident with it enough to at least go bang around with everyone else.

Needed to drill some holes in these RW gears because only 2 lined up, they would have held just fine but that's not as fun as making a tool to add 2 more!

For peeps who purchased the TA02r kit. I noticed the gear diffs did not come with any type of seal gasket. I wonder if this works just fine without leaking oil or are they designed for use with grease only.

I believe they're meant for grease only, but many have said they've used extremely heavy diff oils with success. I imagine it probably requires frequent servicing. The sealable diffs are pretty inexpensive for the TT02. And if you have the R, you're already set with steel dog bones.

I was wondering how long it would be until Yeah Racing come out with this:

Take a look at the XV-02 gear diff. It is a drop-in and worlds better than even the TT02RR diff.

Is that different than:

Tamiya TT-02 Oil Gear Differential Unit 54875 OP-1875

I just packed my TT-02R front diff with 30K grease but my rear is still just AW......but I am also scratching my head at possibly spending like $60 on 2 diffs when the whole car was $150 lol

Then again I already have $60 worth of steering linkage and universal upgrades

This is a fair observation. I think upgrading a TT02 or TT02R is more for the fun of it, or for racing that requires a non-S variant chassis. Otherwise you're better to get an SRX, or some other more modern platform. I typically run the $22-ish sealed diff in the rear, and then the $15 locker up front. Ends up being a bit less expensive and an overall good package.

I'm trying to walk the thin line of being close to TCS compliant if I want to run a TCS class however local TT-02 classes are a little looser and some live by the "if the upgrade is Tamiya then it is legal" and others claim "box stock" but that is so vague when you can buy a TT-02R or RR type kit......assuming everyone could technically upgrade to everything they can to match a RR and then is it really "box stock" or is it "all upgrades up to an including what comes in the top kit available".......

Meh, whatever, TT-02 racing is fun local bashing or quasi-wannabe roadie racing. Usually once someone gets a TT platform to really run well, they want to or are ready to move to a more sophisticated class if available.

I just want to get mine to do what I want it to 85% of the time lol

I went with the AW grease in the rear diff and the putty for the front. Honestly I feel the diffs are perfect and don't see any benefit of going to oil diffs unless you need to constantly adjust the diffs. The stock diffs in the TT02R are lighter than the sealed diffs and you can easily get the diff action you want or need with grease and putty. They are also cheap so you can have a couple spares set up with varying amounts of putty in them for different actions.

I've had a similar idea of just having an extra diff ready to go with a heavier grease or putty vs. having to open and "change" the grease which is a mess to do trackside and not ideal.

I have the extra "plastic" parts to make an additional couple diffs however I do not have the additional 4 small silver screws to complete the diff........anyone have a part # available that would contain those screws?

I believe this is what you're after:

Rc 2X8Mm Tapping Screw: 44002 none / Tamiya USA

thank you......appreciate that.....

Weekly local Thursday night carpet races last night........didn't go well with the TT-02.

Got there early and had it pretty dialed in.......was turning 13-14sec laps and the occasional 12.9......that is very competitive for us. When I came back to the pits I noticed the inside of one of my tires needed to be re-glued, so I regaled the tires.......car was never the same and a complete oversteering mess. Through all heats and the Main.

After the races I stayed a few mins to try a few things. Since I have tried everything to make the lowest ride height work (about 5mm front and rear) I needed to try something very different. I raised the rear to the top hole on the lower arms for the CVA mounting and went back out. Totally different car of course, now I was prone to traction rolling BUT I could hustle it around the track for 13-14.5 second laps vs. the fish tailing spin-out machine I had.

Since I have the softest springs in the rear with no spacers I think next week I will first try a medium or large spacer in the rear to firm it up a touch and see where that lands me before I go up a spring rate.

Damn TT-02s......they are like the girl in college you know you shouldn't be with but you call each other when you are drunk and you just cannot stop that behavior......

At least I won with my TLR in the 17.5 2wd Buggy class