LS240sx

iTrader: (12)

This doesnt seem to be a common problem but here is my situation.

I swapped an LS1 into my 240sx and bought a rebuild tranny from one of the members here. I had supposed 500 miles on the tranny.

Anyway I figured out my 2nd gear shifting issue but I'm still having a problem with heat and whining. This isn't the normal T-56 whine this only happens when warm, Clutch can be engaged or disengaged and the car can be in or out of gear doesn't matter. The car whines like a loud tea pot. It sounds like bearing but its not a normal bearing sound to me.
Now if I have it in gear and accelerate the tranny will go back to normal but as soon as I go to decelerate it starts again.

All of those problems only occur when the tranny is hot. And I mean hot enough the shifter shaft cant be touched for long periods of time unless your holding the actual shift ball/handle.

Only thing I can think is my exhaust may be heating the tranny up to much because I just drained it and refilled it with SycroMesh and it still does it.

But like I said when the tranny is cold it drives like a dream.

thesource

iTrader: (60)

Its possible that the exhaust is too close to the transmission and causing the heat issues . As far as the noise only coming in once the unit is hot but quiet when the unit is cold , that is not a bearing . Bearings will make noise all the time .

Does the noise increase in sound the faster you drive or does it remain constant ?

LS240sx

iTrader: (12)

No its constant. Under throttle the noise goes away but when off throttle its constant until the car comes to a stop or randomly it will stop making noise if the clutch is in and the car is allowed to idle.

thesource

iTrader: (60)

If the clutch is in and the car is not moving , its not the transmission . There is nothing moving inside of it . If the clutch is out and the car is not moving then the input shaft and cluster are turning but they seldom make noise with no load on them .

LS240sx

iTrader: (12)

Ill put some heat shields around the tranny or wrap the exhaust and see if the noise stops.

thesource

iTrader: (60)

Thats where I'd start too .......

LS240sx

iTrader: (12)

Well I got under the car after running it for a while and the heat off the headers isnt that harsh. No were the temp my tranny gets.

Also after talking to a tremec rep. we think it may be a pilot bearing or throw out bearing issue. Would this noise come from one of these.

wrencher

iTrader: (2)

Is it an engine speed related noise or vehicle speed related?
That would dictate where I'd go from to look for the problem.
If it is making the noise at a stop The throw out or pilot would definately be suspect.

They can make alot of noises when failing.