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How to ID a Twin Grip
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billd View Drop Down
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Points: 22774 		Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Dec/19/2010 at 11:45pm
Originally posted by poormansMACHINE poormansMACHINE wrote:

They only show 2 for the M20, and I'm not believing the 3.07 and up otherwise I wouldn't have been able to pull one from an AMX with a 4.10 and drop it in a Spirit with a 2.87.
If it were different, minor shimming wouldn't have brought it into spec for backlash.
 
VERY true.
All one has to do is think of the size - diameter of the pinion, and the thickness of the ring gear to reach the pinion.  Being on the 20 the 2.87 and higher numbers (lower ratios) were most common, makes sense to make them pretty much interchangable, IMO. But I only play an engineer on my home computer............
with the 2.87 being standard for the auto/V8 combo, but a lot of folks wanting an optional ratio, it makes sense to make them interchange. My car is a good example. It's originally a C differential, twin grip. But the invoice bills the customer for an optional ratio (which it turns out is 3.15) and a whopping 10 bucks cost. They only had to drop the different gears into those who wanted the optional ratio.


Edited by billd - Dec/19/2010 at 11:48pm

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mchaggis View Drop Down
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Points: 118 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mchaggis Quote  Post ReplyReply Direct Link To This Post Posted: Dec/19/2010 at 11:57pm
That's settled then!  2 carriers.
Thanks for your help.  I'll have to move the car for a good look at the cover but if I can't see the letter then it shouldn't matter all that much.
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Originally posted by billd billd wrote:

Simple - put the car in park, raise one wheel and try to turn it.
 
Okay I did this and the wheel turns. What does that mean ??
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poormansMACHINE View Drop Down
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Originally posted by jroemer jroemer wrote:

Originally posted by billd billd wrote:

Simple - put the car in park, raise one wheel and try to turn it.
 
Okay I did this and the wheel turns.

Same direction or opposite?
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Points: 153 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jroemer Quote  Post ReplyReply Direct Link To This Post Posted: Feb/21/2011 at 7:49pm
Originally posted by poormansMACHINE poormansMACHINE wrote:

Originally posted by jroemer jroemer wrote:

Originally posted by billd billd wrote:

Simple - put the car in park, raise one wheel and try to turn it.
 
Okay I did this and the wheel turns.

Same direction or opposite?
 
If I raise both wheels and turn one. The other wheel turns the opposite way.
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poormansMACHINE View Drop Down
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Run of the mill open diff.
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Whats it mean if both wheels turn the same direction?
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It could mean that you have one of the locking type differentials. Worst case it means that the pinion shaft is worn and the spider gears are wedged in position.
Pull the cover and dispel all doubt..
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My 68 actually has a factory "11/39" stamp which means means it's a factory 3.54 ratio. Kinda cool i think because it was optioned up from the standard 3.15 Smile




1968 390 auto AMX w/factory 3.54 twin grip.
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Or it was swapped in.
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