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[Datsun 1200 encyclopedia]

6-speed

Revision as of 08:10, 2 January 2012; view current revision
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Category: Transmission

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.

Contents

S15 6-speed

The 1999-2002 Nissan Silvia S15 Strawberry with SR20DE/SR20DET had an optional close-ratio 5-speed + overdrive (6 forward speeds total). In AUS, the six-speed was in the Nissan 200SX Spec-R model.

This gearbox is made by Aisin. The basic Aisin AZ6 gearbox was made in three versions, with front cases for these engines:

  • Nissan SR20DET (S15)
  • Mazda Renesys (RX8 rotary)
  • Mazda F & B (S2000 and 2001 MX-5)
  • Toyota 1G, 3S (SXE/GXE10 Toyota Altezza & Lexus IS)

A limited run was produced of custom front cases for Toyota 4AGE bellhousing, so with that a Dellow kit might work.

But other wise, use the Cut-n-Shut method.

S15 modified; A-series bell grafted on
19983.jpg

  • FS6R92A
  • only 16kg heavier than a standard 1200 4spd
  • Close ratio 1-5, with overdrive 6th. It is perhaps the best ratios for an A-series engine

Gear Ratios

  • 1st: 3.630
  • 2nd: 2.200
  • 3rd: 1.543
  • 4th: 1.210
  • 5th: 1.000
  • 6th: 0.767

Pilot Bushing

S15 5-speed FS6R92A

  • 32202-B9500 BUSHING-CRANKSHAFT
  • used on L, Z, VG, VQ, SR, KA, and CD engines (same as 71C bushing)
  • Pilot Bushing Inside Diameter: 0.626 to .6300" (Length: .689")
  • Pilot Bushing Outside Diameter: .814 to .815"

Since this is much larger in diamter than the A-series, machining is needed.

A-series crankshaft bore is for a bushing with 0.671" O.D., length .723"

  • The FS6R92A input shaft end can be turned down to ~.671 O.D.
  • Could the A-series crank pilot hole be bored out to .814" so the 71-Series bush can be fitted?

Input shaft end turned down to smaller diameter
th_s15shaft.jpg

Clutch Disc

FS6R92A clutch disc [all 240mm]

  • 30100-85F00 9901-0011
  • 30100-85F14 0011-
  • Spline O.D.: 1"
  • Spline: 24 teeth

There is an A-series clutch disc that is 1" x 24T: 30100-K0500.

Input Shaft Length

How far does the FS6R92A input shaft extend past the transmission face?

  • 5-speed: about 17mm past the flange
  • 6-speed: about 10mm inside the flange

Speedometer

S15 6-speed does not have a speedometer gear.

Clutch Release

How to connect up the clutch?

Gearshift Location

Comparision of Nissan 6-speed with long-5-speed and short 4-speed. The location of the shifter is close to the location of stumpy gearbox shifter.

th_top.jpg

Rear Crossmember

Propeller Shaft

The 6-speed overall length is greater than a stumpy gearbox, but not as long as a a longtail Nissan transmission.

th_side.jpg