I have a
problem with my powerglide. When it gets hot
it will back out of the lights. I've tried more
RPMs to increase pump PSI. I've tried band adjustment.
What do I do to make the trans rock forward
an inch or two when the brake is applied?
When you push the transbrake button you would expect it
to hold. Sounds simple but it is not. Quite a few things
must take place to make this happen.
1. We must have smooth adequate pump pressure
and volume hot or cold.
2. We must have a good low gear system, both band and drum
in good condition with good steady pressure.
3. Good reverse clutch system, clutch linings in good shape
with good pressure no leaks.
When you apply your solenoid it takes low
gear oil pressure and splits it to apply reverse. So if
you have a weak pump or internal pressure leaks the low
band may let go! So Darren, chances are your pump is worn,
causing hydraulic pressure to drop, especially when hot.
If you get out your transmission pressure gauge and hook
it up to the low servo to take a pressure reading. You will
probably find that it drops off a lot when hot. Normally
it should not drop more than 5-10 percent at idle. When
this trans is right you should be able to lock it down where
you choose and it should hold you right there.
You can also email Mike Stewart
Mike Stewart Can Cure Your Automatic or Powerglide Problems