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Discussion Starter #1
I need to find out what rear end i have i'm pretty sure i have 373 gears but, is it a Dana or a Sterling, is it 10.25 or 10.5. The tag on the inspection plate is rusted and not legible. I'm wanting to go to a 4:10 rear but need to know what i have so i can get the right gears. Any help would be appreciated
 

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Powerstroke Junkie
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On the Dually you have the Dana 80, you could have either 3:73 or 4:10, there should be a tag on the diff that has the code on it, should be attached to one of the bolts on the diff cover. If not simply mark the yoke on the drive shaft and on the pumpkin and jack the rear end up and count how many times the drive shaft turns to 1 rotation of the wheel.
 

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Discussion Starter #4
yeah the tag is rusted so bad i cant read it, so i guess im stuck jackin the truck up
 

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You might also look on the drivers side door jamb....I have a decal there that has a rear-end code listed.
 
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