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HOW CAN I TELL THE DIFFERENCE BETWEEN AN M21 AND M20 GEARBOX? I HAVE A 4 SPD BOX IN FRONT OF ME HOW CAN I TELL WHAT IT IS?
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There should be a groove machined into the front of the input shaft - where the splines start.
From memory, 1 groove is M20, 2 grooves is M21.
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Mick
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Not always. Put it in 1st gear, and turn the input shaft so that the output shaft turns once. Count how many times you turn the input shaft. 3.74 = M22. 3.05=M20. 2.54 (V8) =M21. 2.54(6cyl) = XU-1 M20 or M21. If it's any other ratio post back here and i'l |
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Not always. Put it in 1st gear, and turn the input shaft so that the output shaft turns once. Count how many times you turn the input shaft. 3.74 = M22. 3.05=M20. 2.54 (V8) =M21. 2.54(6cyl) = XU-1 M20 or M21. If its any other ratio post back here and ill |
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i have always worked on:
no groove = M22
1 groove = M20
2 grooves = M21
exceptions to this rule are rare.
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Exceptions to it are common im my experience. Especially with the proliferation of aftermarket input shafts. Plus XU-1 box with 899 cluster has 2 grooves, and it's not an M21 (or an M20 for that matter). Same for L34 track pack box.
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Exceptions to it are common im my experience. Especially with the proliferation of aftermarket input shafts. Plus XU-1 box with 899 cluster has 2 grooves, and its not an M21 (or an M20 for that matter). Same for L34 track pack box.
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I WAS TOLD THE V8 M21 G/BOX HAD A LONGER INPUT SHAFT. IS THIS CORRECT?
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All V8 aussie 4spd boxes have a longer input shaft, including the V8 3spd.
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