What’s the side of the hose that’s on the return line for the transmission because I want to run my own hose or what sise hose will fit on the metal part

 

spell checks really given you a beating there bro

but I assume you wish to know the internal rubber hose size is 3/8". The steel pipe has a 3/8" OD

 

A quick and easy way to measure stuff like that on your own is using an open end wrench......

 

gotta say I love my $20 digital vernier, had it many years

My son cracked the screen about 10yrs ago, and I stuck wide sticky tape over it

(btw..this works very well for cracked mobile phone screens..they will last for years if you tape over the crack straight away)

can hardly even remember how to read manual vernier these days