Anyone know where I can get info to decode the rear differential tag on my 1999 F-150?

Thanks.

 

if its original this should help

https://www.ford-trucks.com/article/...r_Decoder.html

if not post tag info

 

H9

Thanks.

The metal tag on the rear differential has several numbers/characters I wanted to decode, but I guess they aren't that important for my purposes.

Do you think there is any measurable difference in gas mileage between the 3.55 and the 3.73, under normal driving conditions and highway speeds?

Thanks again.

 

not really sure as far as mpg. somebody on the board im sure can answer that one

 

H9 is 3.55 Limited Slip.

 

Not much. You probably wouldn't see more than 1 mpg or so difference.

Steve