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Hi Isaac, is the one in there now a 4 speed? check the grease level in it and also check the clutch to see if the noise might be a blown clutch.
You will need a five speed that is the same length uless you want to have your drive shaft shortened.
The 5 speed I have is 32 inches long. but it is old style L motor. It will not work with your Z 24. Last time I was at pick a part they had a couple 720 inthere and a hardbody, but I am not sure if they had they trans in them.