Obs rear axle

[02POWERSTROKE7.3]

Does the obs f250 and f350 use the same rear axle? If not what is needed to swap a 350 axle into a 250?

 

[Bobby@cp]

Yes and no, depends on if the 350 is a dually or cab and chassis. Differences are different width and the spring pads.


But its a srw 350 then yes its the same axle as the 250

 

[02POWERSTROKE7.3]

Would 3.55 or a 4.10 gear be better for a set of 35s?

 

[Bobby@cp]

4.10s

 

[ryanss22]

deff 4.10's

 

[m j]

I have zf5 3.55s and 35" tires, 4.10 would suck on the highway here.
2000rpm is a nice cruizing speed
picking it up in 2nd on a hill isnt great

 

[STROKED_NY_023]

Does the obs f250 and f350 use the same rear axle? If not what is needed to swap a 350 axle into a 250?

Both use the Sterling 10.25 axle, there is no difference between them.

Yes and no, depends on if the 350 is a dually or cab and chassis. Differences are different width and the spring pads.


But its a srw 350 then yes its the same axle as the 250

Sterling 10.25 perch widths do not change unless its a c&c truck, which not only has narrower perches but also the axle width is narrower.

A standard dually axle will bolt right under his truck no problem.

Would 3.55 or a 4.10 gear be better for a set of 35s?

I am running 37's with 4.10's and it does great on and off road.