I use this part on my TB EVO IV because I could not find the 49359 hop up part and it fits perfectly. If you have a EVO IV you can buy it without think two times. I actually have two of this on my EVO IV, front and rear, I removed the one way and the ball diff on the rear and I got much more performance.
Detail of machining is not as good as Yokomo's, but I'll do the job no problems. It comes with steel diff cap which is excellent. However there is no replacement gears availible, so as soon as the gear strips, you might as well buy another set of this!! Sad face :(
This is a must upgrade for bashers and asphalt racers, it will drastically improve exiting a corner at the expense of entering speed, however this little problem can be fixed with softer springs at the front.5/5
I use this spool for my Tamiya TB Evolution V.
It fits with the shims I also use for my differential.
The part is aspected Tamiya quality. Even if I would prefer to use blades (pin protectors) which is not possible with this part.