TH400 Leaking
Thread Starter
2nd Gear
Joined: Sep 2015
Posts: 2
Likes: 0
TH400 Leaking
Hi all.
I have a 74 Corvette with L82 and TH400 - The car is well taken care of through the years and is a matching numbers car.
During the last winter the engine and trans was pulled due to an upper a-arm mount that was in a bad state.
At this point all seals were changed on the TH400.
The trans has since this been leaking after the car has been parked. I have never found out where the leak originates from and have changed the oil pan seal just to be sure.
I have just realized that the leak seems to occur when the car has been started and have been moved or driven (a short time 2-5 minutes) without engine and trans have reached working temperatures.
Does this make sense to anyone?
Best regards
Petter
I have a 74 Corvette with L82 and TH400 - The car is well taken care of through the years and is a matching numbers car.
During the last winter the engine and trans was pulled due to an upper a-arm mount that was in a bad state.
At this point all seals were changed on the TH400.
The trans has since this been leaking after the car has been parked. I have never found out where the leak originates from and have changed the oil pan seal just to be sure.
I have just realized that the leak seems to occur when the car has been started and have been moved or driven (a short time 2-5 minutes) without engine and trans have reached working temperatures.
Does this make sense to anyone?
Best regards
Petter
Race Director
Joined: May 2006
Posts: 18,736
Likes: 2,582
you cannt determine whether the leak is from the front or the rear of the transmission?
You have looked at the rear seal and it is dry?
The pan gasket you installed is dry?
The vacuum modulator is dry?
The engine to transmission seam is dry?
Your description seems to indicate it only leaks when the transmission has internal pressure.
You have looked at the rear seal and it is dry?
The pan gasket you installed is dry?
The vacuum modulator is dry?
The engine to transmission seam is dry?
Your description seems to indicate it only leaks when the transmission has internal pressure.
Thread Starter
2nd Gear
Joined: Sep 2015
Posts: 2
Likes: 0
I haven't been able to determine where the leak is coming from - other than it seems to originate on the passenger side. The flange of the oil pan on the passenger side an partly on the front are wet from oil.
I have read other places that this can occur if there is to much oil in the pan due to wrong length on the dip stick as well as a oil filter that is to high in the rear. It has been said that oil will leak from the vent pipe in these cases.
Petter
I have read other places that this can occur if there is to much oil in the pan due to wrong length on the dip stick as well as a oil filter that is to high in the rear. It has been said that oil will leak from the vent pipe in these cases.
Petter
