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diff ratio's ? 

 

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 Post subject: diff ratio's ?
Posted: Sat Feb 12, 2005 5:10 pm 
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Hi guys, does any one out there know how I can tell what diff ratio I have in my XF panelvan ? I have been to my local FORD dealer but their computer could only give me the available ratio's for my model (3.5,3.23,2.92). Any help much apprerciated. :?

 

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Posted: Sat Feb 12, 2005 6:54 pm 
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Ratio should be marked on a tag mounted on the diff centre cover plate

 

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Posted: Sat Feb 12, 2005 8:01 pm 
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madmax wrote:
Ratio should be marked on a tag mounted on the diff centre cover plate
If it hasnt been pulled off/lost in the last 20 yrs, what does the build plate say, should have a code for axle.
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Posted: Sat Feb 12, 2005 8:31 pm 
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xf van 4.1 auto should have a 2.92:1
xf van 4.1 4speed should have a 3.23

but thats if they havnt been changed
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Posted: Sun Feb 13, 2005 9:34 am 
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I have a XF 4.1 with 3 spd column shift manual

 

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Posted: Sun Feb 13, 2005 10:58 pm 
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xr8 dismantler wrote:
xf van 4.1 auto should have a 2.92:1
xf van 4.1 4speed should have a 3.23

but thats if they havnt been changed

check for a tag om the plug
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Posted: Mon Feb 14, 2005 12:03 am 
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mongrl wrote:
I have a XF 4.1 with 3 spd column shift manual


cant remember it will be either 3.23:1 or 3.5:1
there will be a tag bolted to the backing plate on the diff near where you would fill the oil. this tag will have it written on it.
if not remove the backing plate and count the teeth on the pinion and the crownwheel.
the formula is easy

flywheel teeth / pinion teeth = ratio :1
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Posted: Mon Feb 14, 2005 12:07 am 
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Thanks for the advice. I checked the tag on the diff. It has a 3.23 ratio.
I also have a diff(disc,limo) in my 79LTD(351C+T5 finespline HD box) with a 2.77 ratio. I am about to put twin TO3 turbo's on the 4.1 and was wondering which would be the better ratio? The LTD diff is going into the panelvan. Is it possible to swap the gears or would the 3.23 six gears be weaker than the 2.77 V8 gears?

 

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Posted: Mon Feb 14, 2005 12:26 am 
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you cant swap the 2.77 /3.23 gears the carrier is different
you would need to change the whole diff
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Posted: Wed Feb 16, 2005 5:33 pm 
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look for a tag somewhere on the diff.
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