heres another stupid one. . .
what's the difference between the torrie m21 and the later commonwhore 4 speed
and whilst we're on the subject of m21s, what ratios are available??
thanks in advance,
Dan.
righto, 4 speeds??
Started by
_knighty_
, Apr 05 2006 12:26 PM
11 replies to this topic
#2
REDA9X
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Posted 05 April 2006 - 01:23 PM
bugger all differences really, ratios are (for M21) 2.54:1 1st, 1.83:1 2nd, 1.38:1 3rd and 1:1 4th
#3
_knighty_
_knighty_
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Posted 05 April 2006 - 03:14 PM
so there are no differences in ratios, no alternate sets of gears??
#4
_JBM_
_JBM_
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Posted 05 April 2006 - 04:26 PM
Theres a wider ratio M21 with a 3 something to 1 1st gear.
James
James
#5
_knighty_
_knighty_
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Posted 05 April 2006 - 04:31 PM
what? in the serial on the box? or 1st gear ratio?3 something?
how would one go about picking one of these out of a croud?
Edited by knighty, 05 April 2006 - 04:32 PM.
#6
FastEHHolden
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Posted 05 April 2006 - 04:47 PM
for 6 cylinders M21 are a rare find...my guess is you will never see one.
More common is the M20 that saw service until the end of the VK Commododgy.
no difference in strength...just a bit different in ratio but thats about it.
In V8's you might find a an M21...according to the VK manual they were only fitted to 308's....the M20 V8 box came behind 253 and 308.
More common is the M20 that saw service until the end of the VK Commododgy.
no difference in strength...just a bit different in ratio but thats about it.
In V8's you might find a an M21...according to the VK manual they were only fitted to 308's....the M20 V8 box came behind 253 and 308.
#7
_knighty_
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Posted 05 April 2006 - 04:53 PM
so what's the difference between the six and the 8 m21? is it just the imput shaft??
#8
FastEHHolden
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Posted 05 April 2006 - 05:21 PM
essentially...yes...its just the input shaft and throwout bearing sleeve....but I don't think its a case of being able to swap them over...i'm pretty sure some ppl here know something about it..we covered this in the old forum....we covered lots in the old forum....lost to the ether!
#9
surfmaster
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Posted 05 April 2006 - 06:51 PM
There may be a difference between the 6cyl cluster and the V8 cluster, from memory 1st or 3rd gear is different between them (as well as the input shaft).
#10
REDA9X
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Posted 05 April 2006 - 07:54 PM
L34 had a different 3rd gear, cluster gear and input shaft to the standard M21, I can't remember the ratios off the top of my head. Other than that M21's are all the same. M20 was behind the 253 and 202 and had different ratios.
#11
_LCGTRRRR_
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Posted 06 April 2006 - 04:52 PM
clusters between 6cyl and V8 M21's do differ. The 6cyl XU1 box had a 1.25:1 3rd gear as opposed to 1.38:1 3rd in the V8 boxes. 6cyl M21's are as rare as hens teeth. The '73 bathurst cars had alternate ratios being a 2.32:1 1st gear and these are.....well,whats rarer than hens teeth?
L34's were also fitted with both the XU1 style boxes with a 2.32 1st gear. I think the cluster gear part number is 9939484 or someting like that.
Cheers all.
L34's were also fitted with both the XU1 style boxes with a 2.32 1st gear. I think the cluster gear part number is 9939484 or someting like that.
Cheers all.
#12
_JBM_
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Posted 07 April 2006 - 10:20 AM
M20 has 3.05:1 first gear.
M21 has 2.54:1 first gear.
L34 gearbox part no is listed as 9937408.
Optional first gear of 2.32:1.
M20 (opt L32) gearbox part no is 9930988.
1st 3.05:1
2nd 2.19:1
3rd 1.51:1
4th 1:1
Rev 3.05:1
M21 LX (opt L31)
1st 2.54:1
2nd 1.83:1
3rd 1.38:1
4th 1:1
Rev 2.54:1
MC7 LX T10 (requires tunnel mod)
1st 2.43:1
2nd 1.61:1
3rd 1.23:1
4th 1:1
Rev 2.35:1
M21 has 2.54:1 first gear.
L34 gearbox part no is listed as 9937408.
Optional first gear of 2.32:1.
M20 (opt L32) gearbox part no is 9930988.
1st 3.05:1
2nd 2.19:1
3rd 1.51:1
4th 1:1
Rev 3.05:1
M21 LX (opt L31)
1st 2.54:1
2nd 1.83:1
3rd 1.38:1
4th 1:1
Rev 2.54:1
MC7 LX T10 (requires tunnel mod)
1st 2.43:1
2nd 1.61:1
3rd 1.23:1
4th 1:1
Rev 2.35:1
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