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F-250 Member
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42 Posts
Discussion Starter #1
i have a id tag off my rear dana 60 of my 78 f 250 and the tag reads 3 73 D8TA HO
603900-1
i think the 3 73 is the gear ratio and if it is what would i need to go to if i want to put 35in tires on my truck someone please help
 

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Fawkin Fordhead
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31 Posts
Yup, 3.73:1 is the ratio. What size tires do you have now? I'll need that to figure out what you'll need to keep the same performance you have now.
Evan MacDonald
 

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F-250 Member
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42 Posts
Discussion Starter #3
theres 31in on there right now and i dont remember if i put this but im putting in a 400hp ford 400 hope that helps and i want 35in tires on it too just to let you know again
 

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Fawkin Fordhead
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31 Posts
To keep the gearing so that it's equal to what you have now, you'll want something around 4.20:1, but, 4.56 will be better, more power to turn the tires, and all that good stuff. If your concerned about gas mileage, that 400 should handle 35's with your 3.73's
Evan
 

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F-250 Member
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42 Posts
Discussion Starter #5
so i should keep the 3.73 if im on a budget or get the 4.56 or it doesnt really matter cause they'll both work
 
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