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How to ID a Twin Grip
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Peter Marano View Drop Down
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    Posted: Apr/06/2013 at 10:45pm
3.15:1
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tumbleweed View Drop Down
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2000 RPM@ 50 mph.    anyone got an idea of the gear ratio
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phast1 View Drop Down
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Points: 610 		Post Options Post Options   Thanks (0) Thanks(0)   Quote phast1 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/08/2011 at 6:59pm
Originally posted by gunnarcove gunnarcove wrote:

phast1,
where is that stamp on your rearend? is that normal to be stamped on housing like that?
thanks,
 
don


Hi Dan,

It was near the top right of the cover, found it when i was prepping to paint the cover. I don't know if this a normal stamp or not, maybe someone with more knowledge could shed some light on this.
1968 390 auto AMX w/factory 3.54 twin grip.
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gunnarcove View Drop Down
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Points: 53 		Post Options Post Options   Thanks (0) Thanks(0)   Quote gunnarcove Quote  Post ReplyReply Direct Link To This Post Posted: Apr/08/2011 at 7:33am
phast1,
where is that stamp on your rearend? is that normal to be stamped on housing like that?
thanks,
 
don
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poormansMACHINE View Drop Down
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Or it was swapped in.
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phast1 View Drop Down
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Points: 610 		Post Options Post Options   Thanks (0) Thanks(0)   Quote phast1 Quote  Post ReplyReply Direct Link To This Post Posted: Apr/07/2011 at 8:03pm
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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poormansMACHINE View Drop Down
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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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Whats it mean if both wheels turn the same direction?
73 AMX Javelin PC
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poormansMACHINE View Drop Down
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Run of the mill open diff.
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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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