rear DIFF
 

so i have a severe question i just finished replacing my clutch and drive shaft on my FC, the problem now when i drive the car the rear diff makes a clunking noise as if its hittign the body what to i do replace the bushing, make sure its, tight or is it something else please help i don t wanna break my car

In the future you should include your Series of car.If not your thread is not going to pop up.
FC ...Learning now makes it easier for when you get to the Main section!..(they are cruel..!!!!)
You have to Pretty well drop the subframe if your Front diff mount is broke,ripped,whatever.
I'd check before getting into that though.

well i think the bar that runs along the drive shaft from the front of the diff is missing the bracket that mounts it cause it moves up and down and it seems like it might put alot of stress on the drivetrain im worried about it breaking

9/10 times it's the front diff mount sheared which is the culprit. Replacing it with the MazdaSpeed replacement and fitting a pinion snubber should fix the issue. To test, simply get a pry bar under the front of the diff and see if it moves freely, it will be pretty apparent.