The final drive of any car is determined by the combination of the rear end ratio and the final drive of the transmission. I think that in the 107's the lowest final ratio you can get STOCK is in the 1980's cars with a 1:1 transmission and a 2.43 rear end.

That would mean that for 2.43 turns of the engine you would get 1 turn of the rear wheels.

A five-speed (.87 overdrive) 3.5 with a 3.69 rear would get you a final drive of 3.21 (.87*3.69).

And ,of course, you can further change the distance covered by each turn of the engine by varying the tire size.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe