The new T6.4 truck has some updated front end parts which also fit the B6.4 buggy. These change the angle of the steering bellcranks to sit at a steeper angle (27.5 degrees instead of 22.5 on the B6.4). This matches the angle of the B6.3.

The main advantage of this is if you are running higher caster, the bellcrank angle is more closely matched to the caster angle. This keeps the bumpsteer more consistent throughout the steering throw.

We've been able to test some proto parts of this and we've found it gives the car more low speed steering without making it feel more edgy or difficult to drive. There is no change to geometry in the straight ahead position so you can use your existing settings. We usually use caster in the 27.5 to 32.5 range on dirt.