Originally Posted By: robertcope
Originally Posted By: rooflessVW
The Miata and the S2000 (and the Morgan 3 Wheeler!) share the same transmission.
I'm 99% sure that is not true. They're similar, Ibut they're not interchangeable, either completely nor internally to my knowledge.
S2000:
Miata:
I own both a 2001 S2000 and a 1999 Miata, both transmissions are fantastic.
robert
The casework differs in some details but they are identical transmissions (internals swap without modification). The Miata uses a "Power Plant Frame" whereby the transmission (and therefore the motor) is connected to the differential with an aluminum beam, so there is provision on the right side to bolt up the beam (you can see the PPF boss in your photo). Bellhousings differ.
There is no provision to use a PPF in the S2000 or the Morgan, but there is room and a Miata variant bolts in to those vehicles. The other way around doesn't work, however.
The S2000 also uses a rear differential manufactured by Mazda with some differences from the Miata unit (PPF boss, for example) but again the internals swap.
The 6-speeds are Aisin units, the Miata 5-speed is a Mazda part (early Miata). The 5-speed is an even better shifting unit than the 6; some say (Car & Driver magazine, for example) the best feeling manual ever used on a production vehicle.