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Discussion Starter #1
Quick question for you guys... I have a 14 bolt FF in my 1986 1 ton diesel... on the gear it has the GM part number then 9 41 11 85

I beleive I have 4:56 gears, which works out
41/9=4.56,
but 41/11=3.73

so what gears do I have??? And I think this is a limited slip, but I'm not sure???

[img=254x192]http://img337.imageshack.us/img337/3528/unnamed6mp.jpg[/img]

[img=254x192]http://img337.imageshack.us/img337/3143/unnamed17bb.jpg[/img]

[img=254x192]http://img337.imageshack.us/img337/5938/unnamed26jo.jpg[/img]
 

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I don't know about the gear serial numbers, but you should be able to mark the pinion and the ring gear, and count the number of revolutions. 3-3/4 revolutions of the pinion for one revolition of the ring gear means 3.73 gears, 4 revolutions means 4.10s, and 4.5 revolutions means 4.56s.
 

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if i remember correctly
the 1st 2#s is the ratio, the second was the production dates.

which would make sense, since you say its a 1986 1 ton.
 

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On 2005-11-25 19:06, K5Chris wrote:
4.56 manufactured in november of 85.

i sorta said that already.
 

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On 2005-11-26 14:13, K5Chris wrote:
you want a cookie?

and a Bozo button. :fu:
 

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I think the diff. between a open and limited diff is one has 4 holes for the cross pins this be the open one and the limited one is 3 holes.
 

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Discussion Starter #10
Cool, thanks guys... I was really hoping for a good ratio and 456's are pretty much as good as it gets from factory
 
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