I am trying to find out the part numbers that I need to to change my ring and pinion from 3.73's to 4.30's. I called a local Ford dealer and they said they were 3 different axle numbers for my early 99 F-250 superduty for the front alone. I went outside and looked under my truck and wrote down every number I could find on the differential but nothing matched what he (parts guy @ dealer) had.

1. Does anyone know where I can find this information?
2. Does anyone know what the numbers should be?
3. Does anyone know where I can find aftermarket 4.30's?

This whole thing with changing out the gears is really a pain in the butt.

Richmond does not make 4.30's, at least for the Superduty! Nor does anyone else that I have found!

Thanks,
Mitch

http://albums.photopoint.com/j/AlbumList?u=1661094

 

Interesting...

My wife is considering swapping the 4:30's in her 2000 250SD 4x4 to 3:73's. My unanswered question is this:

Is it just a ring and pinion swap?

Spike

 

What's up Mitch.....Look at my topic, can you help me??

Talked to MJ yesterday and he told me your truck was running 12.50's.........That means 15.50's right?

-Crawford-

 

I don't know the answer to your question but I'm sure if you post this question on ford-diesel.com you would get more responses.

MarkR