Originally Posted by
tobyzhang
There are 2 concerns before I'm set on buying the ultimate.
1. Is the gear diff improved from the XI? I think the XI diff is very poorly produced and the internal drag is unacceptable. It is absolutely horrible compared to Tamiya's and I've fixed it by going to tamiya 416/ 417 gear diff and sanded down to reduce width a little, and switch to 37 pulley up front. If the new diff is not decent, I don't think there is another brand gear diff to replace that 40 tooth pulley.
2. Does the ultimate accept XI short shock tower? Do they have the same hole patter? I would like to have the ability to fit my low profile tamiya bodies and experience says the low profile tower will work. I don't want to lose that ability.
The gear diff my my xi sport is smoother then the gear diff in my ultimate. But i bought both cars used and both diffs felt the same after i rebuilt both of them i havnt seen a problem with drag.
As for shock towers they look the same to me. Here is a front and rear shot.
Sorry the xi sport is a bit dirty due to some driveway testing.
Ultimate-xi sport.
Ultimate-xi sport
