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Good diff ratio for 253 with m21??
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red Offline
#1 Posted : Thursday, 14 September 2006 6:46:34 AM(UTC)
red

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Anyone know a good diff ratio for a HQ sedan with 253 and M21?

I need to buy a diff but not sure what ratio, i do a lot of both city and highway driving. If anyone has anything for sale please email me at: [email protected]
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Dr Terry Offline
#2 Posted : Thursday, 14 September 2006 7:31:40 PM(UTC)
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HI red.

You have the age-old problem of the M21 having a tall 1st gear, in a heavy car (HQ) & lack of low-down torque (253). This is the reason that GM-H usually only fitted the M21 to 308s. The problem will be worse if the engine has a non-standard ca
If at first you don't succeed, just call it Version 1.0
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HK1837 Offline
#3 Posted : Thursday, 14 September 2006 11:37:35 PM(UTC)
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Dr Terry's point is very important - you must be careful with your diff ratio selection with an M21 behind a 253. That cannot be stressed enough. Starting from scratch I'd select an M22 with a 2.6:1 or 2.78:1 diff, but as you already have the M21 follow T
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red Offline
#4 Posted : Saturday, 16 September 2006 3:21:15 AM(UTC)
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Thanks guys, i do have a m20 out of a 6 cylinder. I know the input shafts are different but are the internals strong enough??
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Dr Terry Offline
#5 Posted : Saturday, 16 September 2006 4:52:35 AM(UTC)
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Hi Guys.

Another common myth !!

There is no difference in strength between the various ratio versions of the Aussie 4-speed gearbox. M20, M21 & M22 Aussie 4-speeds only differ in their ratios, all have the same strength.

The M20 ratio box was st
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red Offline
#6 Posted : Saturday, 16 September 2006 6:27:31 AM(UTC)
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Are these parts readily available new? Thanks for ya help!!
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HK1837 Offline
#7 Posted : Saturday, 16 September 2006 8:20:06 AM(UTC)
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Yes but they are dissapearing quickly. You can convert either your M21 or M20 to a V8 M22 by using the cluster and 3rd gear out of a 6cyl M22 and the input shaft & dust cover from a V8 3-speed. The rest of the box is the same.
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