Determine gear ratio from PN on ring gear? - Ford Powerstroke Diesel Forum
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Old 01-04-2012, 12:07 PM
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Determine gear ratio from PN on ring gear?

While I was flushing the fluid in my front diff, I believe I have the stock 3.73 gears still but was trying to confirm. I wrote this number down off the ring gear:

10 02 04 Dana T47918F8L806 41 11

Then a little further away is printed 3 99.

Is there any place that can decode the part number or cross reference it to a gear ratio? I think the fact that it says Dana and is such a long part number means that its the original gear set, because I think most aftermarket rings are stamped with the ratio?

Randy's Ring and Pinion doesn't have an email link anymore.
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Old 01-04-2012, 02:23 PM
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The last 4 digits are the tooth count 41 on the ring and 11 on pinioin it gives you 3.7272727272 or 3.73, stock ratio for powerstrokes.

Dik
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Old 01-04-2012, 02:30 PM
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Here is the break down of the numbers on this link. It is not specific to 60s but it does give the break down of their numbers. I will see if I can find anything else.

Dik
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Old 01-04-2012, 02:36 PM
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This link has anything you would ever want to know about a front Dana 60 axle. I used to to re build my 60 in my K5.

Dik
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Old 01-04-2012, 04:41 PM
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Do you know what spline axles these trucks have stock?
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Old 01-04-2012, 04:42 PM
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Thanks for your info!
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Old 01-04-2012, 06:56 PM
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The rear is 35 spline and since you have an 05 your inners and outers on the front are 35 spline.

Dik
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Old 01-05-2012, 04:55 AM
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Do you have a axle tag on the rear diff?? How about a front axle sticker??
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Old 01-05-2012, 06:26 AM
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Got a tag on the front diff, haven't looked at the rear.
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Old 01-05-2012, 06:38 AM
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If you can post the info on the tag line by line as shown on the tag for both front and rear it may help.

Otherwise you will need to perform a check. Mark the tire at the 6'oclock position. Mark the driveshaft at a spot where you can see it from the side. Rotate the tire and count the number of completed revolutions the DS makes compared to the tire.

So the tire mark will make one full turn with: (3.73 turns, or 4.10 turns, or 4.30 turns...etc etc) as the DS turns. OR take the diff covers off and count the teeth.

There are some on-line calculators that will give you an estimate based on tire size and RPMs.
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