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[Datsun 1200 encyclopedia]

W Gearbox

From Datsun 1200 Club

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Categories: Transmission | Transmission Modifications

The W-series is a 4-speed or 5-speed manual transmission built by Aisin. It is a super strong transmission which will just fit in the Datsun 1200 transmission tunnel.



Toyota W transmission by Aisin. About 90 pounds. W can handle 300-350 ft-Lb torque. If your engine makes more torque, use the larger heavier Toyota R transmission. The R154 can handle 450-550 ft-Lb torque.

  • W50 5-speed Steel Case (all others are alloy)
  • Steel case and alloy case gearboxes do not interchange
  • W55, W56, W57, W58, W59 all interchange bellhousings
  • All have the same output splines in common with the T50 Automatic gearbox
W55 5-speed 0.850 overdrive, 3.566 1st
W56 truck extra-low 1st gear 3.954 1st
W57 5-speed 0.861 overdrive, 3.285 1st
W58 5-speed 0.783 overdrive, 3.285 1st
W59 truck extra-low 1st gear 3.954 1st
1973-1981 Celica, Carina, Corona, Supra, Hilux
2002-2005 USA Lexus IS300
1983-1986 Supra Japan
1986 Crown
1986 Cressida
1982-1985 Celica with 21R engine
W58 (same as W57 except for 5th gear ratio)
1982-1998 non-turbo Supra, Celica, Cressida, Soarer
1982-1985 Celica USA
1992-1997 Lexus SC300
1982-1992 Lotus Excel

W58 came in North America Celica 1982-1985 -- all with 22R engine
Coupe | Liftback
400px-1985_Toyota_Celica_GT_coup%C3%A9_%28US%29%2C_rear_right_side.jpgWIKI go to Wikipedia 288px-ToyotaCelicaGT.jpgWIKI go to Wikipedia

ratios W58    W57
1st  3.285
2nd  1.894
3rd  1.275
4th  1.000
5th  0.783  0.0861
REV  3.768

Alloy Case W55-W59

Swap Notes

3Rotor and Cameron_Datto have fitted W gearboxes to Datsun 1200.

To adapt to the Nissan A Engine use one of the following methods:

  • Cut & Shut
  • Adapter Plate
  • A-series bellhousing (custom order from Dellow Conversions in Australia)

12288.jpgAlbum click to view

3Rotor: remove the cross-member mounting pods in the tunnel, open up the shifter hole a bit at the back (no other tunnel mods needed). Cameron had do to "some heating & beating" in the tunnel topic

  • Find/fabricate a 180mm clutch plate to fit the splines of the W
  • Newer W's must swap the electronic speed sensor for a cable drive

Wogboy: The clutch is original datto 1200. I used the datsun clutch fork and cut the opposite side of the bellhousing on the t50. Then I used the Toyota thrust race, ground down the datto clutch fork to clear , then welded a couple of allen keys (strong steel) to reinforce the clutch fork. The result was the sweetest clutch action I have ever felt.

Hydraulic clutch cylinder fitted
12298.jpgAlbum click to view 12297.jpgAlbum click to view 427822729_328b3d2db6_z.jpgflicker click to view

Tail-shaft needs lengthening and the right yoke for this box
427822748_83e2eb91a5_z.jpgflicker click to view
Tunnel mod: Remove tunnel bosses and use Wide gearbox crossmember
427822747_a176e680c9_z.jpgflicker click to view

More Pics: 3rotor Gearbox transplant


racinaround cut the front 3" off a FWD SR transmission, then welded it to the Supra gearbox. This is handy because Nissan doesn't make RWD 5-speeds that fit the FWD SR engine.

12511.jpgAlbum click to view 12512.jpgAlbum click to view 12513.jpgAlbum click to view 12514.jpgAlbum click to view

Steel Case W50

W50 is the steel-case version of the W gearbox. It does not interchange with the W55-W50 alloy case models.

W50 Adapter Kit

Reportedly, Dellow Conversions offers a kit to bolt up a W50 to a Datsun A-series engine.

W50 Adapter Plate

The W50 Toyota 5-speed can be fitted to a Datsun A-series engine. Use an A-series automatic transmission bellhousing with an adapter plate to fit the W50 gearbox. The W50 is a non-alloy gearbox, and the thickness of the adapter plate would be different for any alloy W gearbox.

6404.jpgAlbum click to view 6302.jpgAlbum click to view 6301.jpgAlbum click to view 7206.jpgAlbum click to view 7209.jpgAlbum click to view

Bare adaptor plate to suit an A series auto bell housing and a W50 steel case Celica 5 speed
6899.jpgAlbum click to view

Adaptor plate bolted to Celica box, clutch fork pivot fitted.
6900.jpgAlbum click to view

Datsun 56A 4-speed verses a Celica W50 steel case 5-speed fitted with an A series auto bell housing and adaptor plate.
6902.jpgAlbum click to view

Above: A series 56A 4-speed
Below: W50 Celica 5-speed below. Modified Datsun clutch fork fitted to Celica thrust bearing. Slot cut through the side of an A series auto bell housing . Clutch fork retaining spring and clutch cable mount still to be made.
6901.jpgAlbum click to view

The input spline lines up exactly

The spigot fits into the back of the A-series crankshaft as per standard but a machined spigot bearing needs to be made to suit the Celica input shaft.

Mods need to be made to the clutch fork, and thrust bearing carrier

A new cross member needs to be made, the tunnel needs a bit of a massage

The speedo cable matches up to the Celica box with no mods.

A clutch needs to be sorted out, a new spigot bearing needs to be made, and a new tailshaft is needed.

funkeyman photos 

POST clubman adapter
6895.jpgAlbum click to view 6894.jpgAlbum click to view 6899.jpgAlbum click to view 6900.jpgAlbum click to view 6901.jpgAlbum click to view 6902.jpgAlbum click to view


Some W's use the same spline/diameter input shaft as the Datsun A. So the Datsun clutch disc fits

Other W's use a larger 1-1/8 shaft with 18-splines. For this you may be able to re-drill the A-series flywheel to take one of the smaller clutches.

Exedy/Daikin KTY18
* Shaft diameter 1"
* Input splines 21
* Diameter 210 to 213 mm
* Celica 1994-1997
* Corolla 1993-1997 

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