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

It is Tamiya part #22049 which I was referring to and only $25. It is an overall better design.

That’s why I race Tamiya’s… the challenge of pushing them way beyond what they were intended for.. the look on people’s face when they realize it’s a Tamiya.. priceless 😎

Does anyone have a part number for the tt02 gear diff screws with Allen head.? can these be bought?

I’ve done this exact thing, and ID the diff stiffness by the number of washers I use on the diff screws. 4 screws in the tightest diff with Bad Horsie diff grease, all the way down to no washers in my loosest diff.

Its a pretty obvious difference between the tightest and loosest settings but it keeps the in between settings in order.

But since getting an XV02, I’ve been getting more oil filled diffs and using the different XV02 diffs in the TT02. Even the 40T diff in the rear of the TT02 feels pretty good (to me at least).

Thursday, which means my weekly battle with the TT-02 Mustang that does "Mustang things" as it clearly had multiple personalities with attention spans shorter than a 5min race as the car's drivability changes several times in a race it seems......

But I feel like tonight is the night.

Since I was busy with my TLRs over the past week since the last TT-02 race I literally haven't taken the body off to tinker at all, therefore, I expect nothing........but I had it somewhat drivable after the Main when I reverted the rear suspension and ride height to the higher setting......so we shall see.

Any betting action on whether I have better results or come back with my usual "the car was a mess" post lol........