4x4 axle questions

[48chevy]

newbie to the post. i am attempting to put a set of 68/69 4x4 axles under my 48 chevy truck. i have identified the front axle, dana 44 and transfer case, rockwell t221. i need assistance in identifying the rear axle. i think it is a dana 44 as well. the only numbers on the rear axle are an 8 and C30265 on the gussets on the back and an 80 on the front as seen in the pics.

i also need help in deciding what to do about the different gear ratios in the front and rear ends. front axle has a tag on stating it is a 4.56 ratio and the a tag on the rear states it is a 4.55. if i regear the axles to 4.11 or 3.92 will i need to replace the carrier?

i already know the front axle is too wide and will need to be narrowed. and since it is a closed knuckle i plan on converting it to an open knuckle when i narrow it down to fit under my frame. is that possible?

any help will be greatly appreciated