6-speed

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6-speed transmission gives you two (count 'em 2) overdrive gears. Or some have a close ratio direct-5th with overdrive, which is better for performance. 6-speeds can be modified to fit Datsun 1200. Just cut the bellhousing and weld on a fragment of A-series bell housing, then machine the input shaft smaller.

S15 6-speed

The Nissan Silvia S15 transmission is a close-ratio 5-speed + overdrive (6 forward speeds total).

S15 modified; A-series bell grafted on

• 71-Series Transmission
• only 16kg heavier than a standard 1200 4spd
• 1st: 3.630
• 2nd: 2.200
• 3rd: 1.543
• 4th: 1.210
• 5th: 1.000
• 6th: 0.767