Think 3.73 gears would be perfect for my truck and use towing.

Are there any dana fronts an rears out there set up like this factory?

Mine has ttb front with 3.55.

 

Nope.. for some reason Ford never installed that ratio in any of these trucks.

 

Thanks Paul, didn't want to hear that. Looks like my only option is 4.10. A little steep but will half to do.

 

3.73 are readily available for whatever differntial you have...just becuase Ford didn't use them, others do. I have swapped out all my trucks to 3.73's and love it.

 

I had 3:73s in my 83 F350

 

Lisagoud did you swap the gears only or use other axle swap from say different brand truck?

 

don't forget you can re-gear via tire sizes too.
since you have 3.55's play around with some tire sizes to see if you can live with shorter tires:
Calulators from www.4Lo.com

my example;
i have 3.55 gears.
stock tire size is 235/85/16
by swapping to 225/75/16 i now have an actual gear ratio of 3.84:1(very comparable to 3.73's,just a tad lower.)

a lot of guys don't like the look of shorter tires on their rigs,but it's something to consider if you haven't thought of this yet.
sure is the most cost effective way to get 'er done too.
however,watch the payload ratings as you go down (unless you have a dually,then its not much of a concern.)