1982 BMW 528e Drive Train Klunk

I have purchased a 1982 BMW 528e I have been replacing quite a few parts due to lack of maintenance from the previous owner. I replaced the clutch, pressure plate, throw out bearing, and clutch arm. After the repairs this was the first time I drove the car, there seems to be a klonking noise in the drive train when you let the clutch out after a shift, most prevalent in 3rd and 4th gears. Can anyone give me advise as to what the possible problems could be?

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http://www.automotiveforums.com/vbulletin/showthread.php?t=287175

I have purchased a 1982 BMW 528e I have been replacing quite a few parts due to lack of maintenance from the previous owner. I replaced the clutch, pressure plate, throw out bearing, and clutch arm. After the repairs this was the first time I drove the car, there seems to be a klonking noise in the drive train when you let the clutch out after a shift, most prevalent in 3rd and 4th gears. Can anyone give me advise as to what the possible problems could be? Have you checked out your rear subframe mounts to see if they are bad that will make that kind of noise.