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What is the difference between M20 and M21 6 Cylinder Aussie 4 Speed gearboxes, how do you tell the difference between them? What length is the input shaft from the face of the gearbox?
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Ok, where do I begin.
The numbers M20 & M21 can refer to any number of Aussie 4-sp gearboxes, as well as Opels, Saginaws & Gemini 'boxes etc. etc.
It's best to dispense with the M20/M21 numbers & look at each gearbox type separately.
With the Aussie 4-sp there are 5 different ratio sets & 2 different lengths, the 4/6 cyl one & the longer V8 version.
The only reliable way to determine which ratio set you have is to pull off the side cover & check the part no. stamped into the cluster gear.
The most common 2 have part nos. ending in either 496 or 497.
The 496 ratio set is the most common with a 1st gear of 3.05, while the 'box with the 497 ratio has a 1st gear of 2.54.
The 497/2.54 box is 'usually' seen only behind 308 V8s but there are several exceptions, which is why I said to check each box on its own merits.
Dr Terry |
If at first you don't succeed, just call it Version 1.0 |
 1 user thanked Dr Terry for this useful post.
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Rank: Member
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Joined: 31/12/2012(UTC)
Posts: 177
Thanks: 11 times
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Thanks DR Terry, a wealth of knowledge as usual
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