Quote:
Originally Posted by ZR-1
the noise has not been there for about 2000 miles that I have owned it. It always had the growl in first gear which I assumed was normal for a 90. The car does seem to shift fine. However, this is definitely the noise of something failing. It sounds like engine knock at anywhere above 40 and letting out of the gas while in gear.
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Quote:
Originally Posted by ZR-1
I am getting quite the noise from my transmission. It is a rattley/knock kind of sound. It only occurs while driving. The sound does not go away while in neutral or clutch disengaged/engaged while driving. I can make the noise quieter if on the throttle in gear but if I let out or "engine brake" in gear its very loud. What could this be?
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So......this is very confusing. You have a Noise under the car or under the hood while driving only (even if coasting in neutral). No noise when car is not moving in neutral? No noise when car is not moving in neutral if you rev the engine?
This
could be driveshaft U joints for all we know.....if
only while driving even if the Transmission is in Neutral. And noise depends on torque applied.
More self diagnosis of exactly where the noise is located would help for sure.
Jerry is going on the basis that your engine is in serious degradation from something letting loose (could be the case from your description)....in which case....do not run the engine until you are sure a Rod does not let loose entirely. That is why Jerry is asking about Oil Pressure
To check your U Joints just go under the Z and with rear wheels off ground and trans in neutral, rotate drive shaft by hand back and forth and look for movement/play in the U joints on both ends of drive shaft and when we are at it....U joints on each side of differential.
Use Jack Stands 
Just in case of the Out side chance (from your somewhat deceptive description) your noise is related to U Joints
See U-Joints
This is where
Bill's ZF Doc Drive Shaft Safety Loop may be of interest.
