10 miles to the Gallon?

[280z1975]

snip ..... Since i got the car i never did any maintinance with the trans.,

I really think its an issue with my transmission fluid, to change my transmission fluid, would that be hard or just as easy as changing my oil?

Thanks agian all the help

If you haven't done anything to the trans since you got the car (and the previous owner probably didn't do anything you think) it would be some good preventative maintenance to change the trans fluid and then you have eliminated one problem variable and helped prolong the life of your car.