when its a good ol' cold morning, the rx7 likes to make this big clunk sound in the rear of the car when i disengage the clutch, but once the car is warm the sound goes away. got any ideas?

 

Yup, a cold transmission, and cold tranny fluid.

 

I had that sound in my Jetta--was a broken pin in my rear caliper.

 

That's the confusing part.
Mostly our 7's clunk when engaging the clutch.
Now you're dealing with torque unload.

Maybe loose rear sub-frame mounts?

 

Yeah but it goes away when the car warms up, if it was the subframe wouldn't it be doing it all the time?

 

Welcome to sucky cold performance issues with generic gear oil. Try some of this:

Transmission:

Redline MT-90
http://www.redlineoil.com/products_g...57&subcatID=18


Popular in Nissan, Toyota and Mazda manual transmissions and transaxles as well as other selected applications, this is a 75W90 GL-4 Gear Oil that’s slightly heavier than MTL. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.





Rear Differential:

Redline 75W90 NS
http://www.redlineoil.com/products_g...57&subcatID=18


This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.

 

My work dump truck does this same thing. I just figure it to being REALLY fricking big gears.

 

ya i didn't think it was a big deal, but thanks on the info. imma go buy me some mt fluid this weekend =]