are all the 84 front bumpers the same cuz i would like to put one of them on instead of the square 82 one..

 

The 84 would fit but, you would need the hood from an 84, your belt trim would not match the trim on the nose. The cowl grill on the 82 is different than the 83 and up so it would not match up well with the 84 hood. Personally I'd just leave it as is as long as it is not damaged.

 

put 82 GT air dam on it

 

or an 85-86 front bumper

 

Can i put an 85-86 one on without having to change the the hood or anythign else, becasue the 85-86 is by far my favorite there just really exspensive.. but i want to keep the hood it has now..

 

no, 83-86 are interchangable. Where do you live? I have a 83-86 brand new 4" cowl hood, and a 86 LX air dam with whatever you need

 

is there any other bumper i can put on my 82 without having to change the hood? or is there a modification i can do to like a 86 to make it work?

 

79-82 used one style hood, and 83-86 used another, the easiest and best looking 79-82 bumber is the 82GT bumper