I've been reading and searching on how to figure out what trans and rear end I have. I've figured out that I have the 4R70W (code U) with a 3.55 gear (code H9), but I can't figure out what size the housing is. The charts I've found would say that it is the 10.25, but I thought that would only come with the 4R100. It's a 12 bolt and isn't shaped like the Ford 8.8.

If anyone could help that would be great. Or if you have a link to something I may have missed while I was searching that would be great too.

 

What year, vehicle, engine, ect?

 

My bad. 02 F150 Fx4 with the 5.4L.

 

Count the number of lug nuts on your wheels. If you have 5 with a 5.4 your rear diff is a 9.75. If you have 7 regardless of the engine you have a 10.25.

JMC

 

Cool, thanks!

 

7 lugs on a F150?

 

yes with the 10.25 rear axle you have 7 lug front and rear on the 7700lb package. On 97' thru 99' was called 250LD, 2000' and 2001' called 7700lb package for F-150.
Or something close to that.