Changing my gears and dealer has told me the rear gears are 9.75 but could not tell me the front size . After looking at replacement gears this is what I have come up with : The front must all be 8.8 and are the same from 97 and up . The back is 9.75 ( dealer confirmed ) and seems to be the same from 99 and up . For people in the know could they confirm this ?


Going to 410 gears for 355's


Truck is a 2009 F150 4X4 .


Thank you .

 

In also thinking about doing this. From what I've found the front gears are 8.8". Best bet for concrete answers would be to talk to a vendor like Summit, 4 Wheel Parts or Stage 3 Motorsports.

 

Have you done the online build sheet/window sticker yet? It shows everything your truck was built with

 

He's not asking for the rear end ratio, i.e. 3.31, 3.55, etc. He is asking for the ring gear diameter and size of the pieces in both the front and rear differential. Build sheet doesn't give that info.