Hello,

I have a TC6 that will work OK for about the first 2-3 minutes of a race, the it gets real squirrely and unpredictable. The back end will sometimes snap loose, but not all of the time.

I have a Yokomo gear diff and I am wonder if I have the wrong fluid in it and it is heating up or breaking down at about the 2-3 minute mark causing issues.

I started out with 500 cst in the rear, but some of it as leaked out so it diffs pretty freely (it does need some TLC). I'm wondering if this is causing issues and I need to rebuild it with 500, or maybe thicker.

Am I on the right track with thinking it could be a diff issue? What diff fluid are other using in the rear diff on med - high traction?

Thanks in advance.