I think you have made a very wise decision. Now you have piece of mind knowing that those tubes and rubber rods are new.That you have had the brakes apart and know exactly what you are dealing with.
As far as a change in height changing anything ,I cannot feel or see the difference. I never measured before I changed axles but I am confident that I gained at least 4 inches in trailer height .If anything it has improved the ride a 100%.
Although it cost a few more bucks my axles ordered by the serial number fit just as good as the old ones I took out.I was able to pickup my axles at the Henshen factory. Its an amazing place.
I have no doubt you will not have a problem with the axles switch ,I did it with only some lumber ,a floor jack,2 four wheel dollys(furniture) and an impact. It took me 3 hrs to do the switch and I'm 70yrs old.
Roger & MaryLou
F350 CREWCAB SW LONG BED
7.3 liter Power Stroke Diesel
1977 27ft OVERLANDER
AIR # 22336 TAC- OH-7
May your roads be straight and smooth and may you always have a tailwind!