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Hello, I am recently interacting with someone of fb marketplace who is selling a 6.9l f250 idi. The sticker on the door jamb has axle code "73". and I can't seem to find the gear ratio for the truck on any online charts. Any help would be appreciated.
 

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According to this chart it is a Dana with 3:54 gears


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yup, dana 70U axle with 3.54 gears.
if you go looking for parts for it, make sure you tell then it is a "U" axle. that is a mish-mash of dana 60 and dana 70 parts, and not all D-70 parts will work on it.
 
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