M20 and M21 Gearbox Catalog

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

Click on the various images to see an exploded view of the componets and parts you are looking for

M20 and M21 Gearboxes:

Identification:

M20 = 1 groove M21 = 2 grooves M22 = Bare.

 

Unfortunately the grooves are not a 100% accurate way of IDing the boxs anymore, because some of the repo input shafts available now do not have the grooves on them. I have copied part of this from a post I did a couple of weeks ago.
From memory if the cluster number ends in
496 it is a M20 (3.05:1 low gear ratio)
497 it is a M21 (2.54:1 low gear ratio)
694 it is a M22 (3.74:1 low gear ratio)
If a 6cyl input shafts end in
923 it is a M20 (3.05:1 low gear ratio)
921 it is a M22 (3.74:1 low gear ratio)
If a V8 input shafts end in
925 its a M20
924 its a M21.
If third gear ends in
491 its a M20
492 its a M21
696 its a M22

Images:


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Links:

Aussie Four Speed

HQ_SS' Full image set at HQ_SS' Shed

Tom Kelly's Shed

9939484 Cluster Info

Part Number Details.

Selector Nut Thread

Terms:

Terms

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