Aussie Four Speed

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Page created by T June 24th 2007:

Back to Gearboxes Transmissions and Differentials

Aussie Four Speed Manual Gearbox. Click to enlargen. Photo by HQ_SS.

1 Aussie Four Speed Gearbox:

[edit] Aussie Four Speed Gearbox:

Officially called the M20 or M22 gearbox in a 6 cylinder car or the M21 when fitted to a V8.

M21's were also made for 6 Cylinder cars. (LJ XU-1's only)

End of submission by 383HGBrougham:

Thread1

[edit] Ratios:

By GraemeG 07/02/11@18:19 2298

Yes, a bit misleading there. The M20-21-22 designations refer to the ratios, regardless of whether they fit 6s or V8s.
M20 ratios:
1st & reverse - 3.05:1
2nd - 2.19:1
3rd - 1.51:1
4th - 1.00:1

M21 ratios:
1st & reverse - 2.54:1
2nd - 1.83:1
3rd - 1.38:1
4th - 1.00:1

End of submission by GraemeG

[edit] Draining the Gearbox:

To drain the oil remove the rearmost and lowest cover bolt from the offside of the gearbox and catch the oil in a tin.

[edit] Filling the Gearbox:

When filling the gearbox make sure the drain bolt has been fitted and tightened down. Remove the large filler bolt in the nearside of the gearbox and place a tin under the hole. Pour in oil using an external funnel and a length of hose until the oil begins to run back out the filler hole and into the tin. When the oil stops draining out, install the filler plug and tighten it down.

Aussie Four Speed Manual Gearbox disembled. Click to enlargen. Photo by HQ_SS.

Aussie Four Speed Manual Gearboxes. 6 Cyl front, V8 back. Click to enlargen. Photo by HQ_SS.

The Transmission Control Switch on a Manual Gearbox from HX and later. This is the side plate of an Aussie 4 speed. The TCS is mounted on the 3rd and 4th selector shaft. Click to Enlargen. Photo by TomKelly88.

Gearbox damage. See the bent crossmember image. Click to enlargen. Photo by Dusty Dirt Roads.

Aussie Four Speed Clutch Cover Plate and Flywheel. Click to enlargen. Photo by HRPanelvan.

The Transmission Control Switch only permits Vacuum Advance in Top Gear when the Engine Temperature is above 63 degrees C. Click to Enlargen. Photo by TomKelly88.

Gearbox damage. See the bent crossmember image. Click to enlargen. Photo by Dusty Dirt Roads.

M20 Gearbox from above showing the filler hole on the nearside . Click to enlargen. Photo by Zac.

Aussie Four Speed Reverse Light Switch. Click to Enlargen. Photo by HQ_SS.

Aussie Four Speed. Click to enlargen. Photo by SLR_6.

Aussie 4 Speed Allsynchromesh Gearbox with Reverse selected. Click to enlargen. Photo by Qute.

Reverse Light Switch. Click to enlargen. Photo by Snowdownunder.

Bent Crossmember associated with the failed gearbox. Click to enlargen. Photo by Dusty Dirt Roads.

[edit] Aussie 4 Speed Gearbox With Cover TCS:

Submission by TomKelly88

note that the rubber seal is located in the side cover not on the selector shaft itself unlike the other selector in this gear box and the selectors in earlier gearboxes.

End of submission by TomKelly88

[edit] M22 Ratios:

Submission by Nicktime21

nicktime21 on Tue, 29/07/2008 - 10:01. *new

These are the ratios

M22 Ratios:

1st 3.74:1
2nd 2.68:1
3rd 1.68:1
4th 1:1,
rev 3.74:1

They where used in one tonners for pulling a lot of load, but for everyday if you dont need it dont get one cause the would give good acceleration bu otherwise be a nightmare.

Cheers

[edit] Output Shaft:

ALL TRIMATICS , AUSSIE 4 SPEED AND 3 SPEED all syncro have the same number and type of splines on the out put shaft only the early part syncro boxes had a course spline output shaft... v8 have a different size uni to sixes..

wombat..