Could a chevy transmission fit a ford?

So i found an 1984 chevy truck looks just like my ford and is a year older just wondering if a chevy transmission from that year could possibly fit a ford? Or vis versa?

Mileage limit on cars on finance?

I've got a ford car on finance and I'm allowed to drive up to 12,000 miles per year, if I go over then I get charged 6p per mile. They have told me I do not have to have my
Update: I'm not renting it. It might be different in america, but this car is