can someone help me decode this - Ford Forums

boredford78 · 07-14-2001, 10:22

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

82F100SWB · 07-23-2001, 11:51

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

boredford78 · 07-23-2001, 16:22

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

82F100SWB · 07-23-2001, 17:16

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

boredford78 · 07-23-2001, 21:45

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