That's wrong, either the T1 or the T2 will fit in any of the NA housings.

Sorry, I wanted to mean that the final gear from the T1 doesn´t fit the T2 LSD because it is bigger in diameter (not the ring size that is in both 7").

I want to keep my 4.30 final gear and I don´t know if both will fit.

By the other way, which of them would you prefer? The information I have is that the TypeI is designed to put out more bias on acceleration and the Type II is designed to have subdued acceleration bias and a stronger bias on deacceleration. The TypeII is more forgiving with trailing throttle.
¿Can anyone verify this? ¿Which of them would be the best for autocross races?

Thanks a lot for you soon reply

Cheers

Sorry, I have a 4.10 final gear also looking to swap a 4.30 (which car can I take it from?)

Cheers

Any 7" R&P will fit on either one. I really don't think there's enough difference between the two types for the average driver to notice. My dad's Type 2 in his Miata feels a heck of a lot like the Type 1 I've got. I'd just go for whichever's the better deal.

Thanks a lot mate. Do you know where can I take a 4.30 final gear from?

Cheers

You should be able to get the gears from Mazda if you tell then that it's for a 1989 or 1990 RX-7 GTUs. Some online stores sell them. The gears from a Miata won't work because the pinion shaft is way too short.