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Old 02-26-2005, 22:34   #1 (permalink)
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Question What is an m21 transmission...and is it good?

This car im looking at has an m21 four speed transmission in it and i was told that these things are awesome...but just how awesome are they?
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Old 02-27-2005, 01:36   #2 (permalink)
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Re: What is an m21 transmission...and is it good?

Quote:
Originally Posted by Young Angus
This car im looking at has an m21 four speed transmission in it and i was told that these things are awesome...but just how awesome are they?
they are a stronger version of a holden 4 speed manual (m20 is the weaker version). they are of reasonable strength but i'd much prefer a toploader.

frind of mine has one factory fitted in his VK SS Group A. He's popped a few gears so far
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Old 02-27-2005, 01:44   #3 (permalink)
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Re: What is an m21 transmission...and is it good?

no stronger just different ratios both not strong boxes why do you think every body puts top loaders into their holdens
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Old 02-27-2005, 02:21   #4 (permalink)
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Re: What is an m21 transmission...and is it good?

They are known to be pretty weak.

Very common to have the cluster gear go through the case hardening; requires new cluster/layshaft to rebuild.
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Old 02-27-2005, 03:23   #5 (permalink)
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Re: What is an m21 transmission...and is it good?

The reason they all put top loaders in their holdens is the same reason that they all put 9 inches in there holdens as well. Holden make a real crappy driveline.
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Old 03-02-2005, 05:07   #6 (permalink)
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Re: What is an m21 transmission...and is it good?

Quote:
Originally Posted by XECLEVO
The reason they all put top loaders in their holdens is the same reason that they all put 9 inches in there holdens as well. Holden make a real crappy driveline.
Doesnt really matter when the starter motor is the most powerfull thing in front of them
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Old 03-02-2005, 06:09   #7 (permalink)
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Re: What is an m21 transmission...and is it good?

hahahha i love the ford holden rivalry...go fords!
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Old 03-03-2005, 19:39   #8 (permalink)
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Re: What is an m21 transmission...and is it good?

M21's just tall in 1st gear. Recommended for 308's or 253's with a 3.5 diff. Otherwise the 253 is sluggish. I used to own a HZ 253/M21/3.08 ratio diff. Never hurt the box unlike the traumatics I hurt. I blew 3 autos pretty easy.

Ford don't make a decent auto I personally think. Chev is the best trans supplier. I've now got a chev auto in the XB. I've blown 5 C4's.

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