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M20-M21
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#1 Posted : Tuesday, 9 September 2008 11:32:25 PM(UTC)
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can you fit a M21 lay gear into a M20 gear box? since it needs to be fixed i thought id change the ratios also...thanks
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#2 Posted : Wednesday, 10 September 2008 12:33:38 AM(UTC)
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Yes you can. Youll have to change 3rd gear and 4th gear (input shaft) as well, but the rest is the same.
You can also buy an XU-1 repro cluster (lay gear) and install it with an M21 input shaft and keep the M20 3rd gear. Gives you the same ratios as an M
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#3 Posted : Wednesday, 10 September 2008 12:33:38 AM(UTC)
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Yes you can. You'll have to change 3rd gear and 4th gear (input shaft) as well, but the rest is the same.
You can also buy an XU-1 repro cluster (lay gear) and install it with an M21 input shaft and keep the M20 3rd gear. Gives you the same ratios as an
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#4 Posted : Thursday, 11 September 2008 7:16:21 AM(UTC)
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there is no fourth gear its direct 1st 2nd 3rd direct
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#5 Posted : Thursday, 11 September 2008 7:35:08 AM(UTC)
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Yes there is. 4th is 1:1 and its otherwise known as an input shaft.

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#6 Posted : Thursday, 11 September 2008 7:35:08 AM(UTC)
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Yes there is. 4th is 1:1 and it's otherwise known as an input shaft.

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#7 Posted : Thursday, 11 September 2008 8:04:16 AM(UTC)
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thanks for that Byron. getting a M21 is almost impossible. there is a local wrecker here who wrecked a VH SS. wants $750 for his M21. he has had it for over a year. i see alot of imput shafts and gears on Ebay and thought to give it a go. its going back i
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#8 Posted : Thursday, 11 September 2008 6:01:04 PM(UTC)
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I'd just leave it as an M20 with that diff. Same strength, same top gear, just better first.

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#9 Posted : Thursday, 11 September 2008 6:01:04 PM(UTC)
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Id just leave it as an M20 with that diff. Same strength, same top gear, just better first.

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#10 Posted : Friday, 12 September 2008 9:15:21 AM(UTC)
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the gear on the input shaft is the gear that drives the laygears.
When you select 4th the input shaft is locked to the main shaft
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#11 Posted : Friday, 12 September 2008 5:24:44 PM(UTC)
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Yes that is correct, and hence why 4th gear is 1:1. Exactly the same as a 3 spd where 3rd gear is 1:1. The input shaft contains the gear that drives the cluster for 1st-3rd and reverse but it also has dog teeth and synchro seat for 4th gear.

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