I know for the C series transmissions there are also 6 speed options. (C160 and C60) Both are good options for fuel economy. If I recall correctly the S series is the same as the 90-95 MR2 transmissions. The only 6 speed that I know of for that block is for the Beams IS200 rear wheel drive application. I think the only major difference in the S transmissions were the side for the shift linkage (MR2) and the LSD option.
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