ko so when im driving my 87 turboll everytime i shift it wakes a clunk sound from the diff. i was wondering if this is a common problem and if it could be the mount or the bushings? which is more common

 

sounds like a diff mount to me

 

i would first look into the differential mount being the culprit. next, do you hear the clunking over bumps or just when you shift?

 

just when i shift pretty much

 

yep front diff mount its kinda a pain to do but they brake pretty easy exp on the track i recommend the mazdatrix competition diff mount
http://www.mazdatrix.com/getprice.as...m=28-6800-FCY1
the pic is on this page http://www.mazdatrix.com/G8DiffMnt.HTM
just rember its your front diff mount and not the rears the rubber sepprates and bakes usaly on really hard launches but also they dryrot and sepprate you gotta realize its a 20 year old car