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[Datsun 1200 encyclopedia]

71 Swap

From Datsun 1200 Club

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Categories: Transmission Modifications | Transmission

5-speed 71-series Transmission are inexpensive and available from about 1975-1995. 71 gearboxes 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

Cut and Shut

Since the 71-series gearboxes do not have bellhousings, a simple adapter plate won't work. Instead, use the Cut-n-Shut method on the front case.

25160.jpg 25161.jpg 25162.jpg

Pilot Bushing

* 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 diameter than the A-series, machining of the input shaft is needed. Then the stock A12 bushing can be retained.

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

  • The 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
21906.jpgAlbum click to view

Clutch Disc

71-series clutch disc [200mm or 240mm diameter]
* Spline O.D.: 1"
* Spline: 24 teeth

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

Input Shaft

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

  • 5-speed: about 17mm past the flange

Flywheel

Use the stock A-series flywheel, which accepts the 180 mm clutch disc. Use the L-series 180 mm clutch disc.

Clutch Release

Use the 71 release lever and throwout bearing. Use a Datsun 1200 hydraulic clutch master cylinder.

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.
side.jpg top.jpg

Relocation of 1200 shifter hole
9582.jpgAlbum click to view 9573.jpgAlbum click to view

Rear Crossmember

9619.jpgAlbum click to view 9598.jpgAlbum click to view 9618.jpgAlbum click to view

Propeller Shaft

If you use a stumpy gearbox, the stock 1200 automatic driveshaft will work.

If you use a longer gearbox, have a custom-length propeller shaft fabricated.

6-speed vs 71C long vs 71B long vs F4W63 stumpy
allfour.jpg 

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This page has been accessed 1,989 times. This page was last modified 02:17, 14 September 2016. Content is available under Datsun 1200 Club.