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man that’s strange. I had my fluid changed in march and have had some intermittent shifting issues and then that grind noise. Maybe time to call the dealership and make sure they filled it.
And i before I had it changed by dealer I told them I’m having shifting issues. They said my fluid was low and dirty after the salesman told me it was good on fluids. So two different stories there.
Not to cause panic but I wonder if your pump was partially cavitating which was the noise you were hearing. Once the fluid level was restored to full, it stopped as there was no more air displacing the fluid inside the pump. Typically being only a quart low wouldn't cause this but it's also possible you were a lot more than just one (1) quart shy of full or those units are super sensitive to fluid levels. In your trans, the pump itself is actually set back a bit from the very front of the case, not directly in front like pretty much all GM transmissions made prior so the location of the sound makes sense. Also pumps can make a variety of different sounding noises but the common themes are 'knocking', 'chattering', 'ticking', 'rattling', etc.
I would agree with you, but it wasn't constant and would happen when cold and when the fluid sloshed around. It was definitely pump cavitation. This is why I will do my own stuff from now on......not some flat rate bafoon hoping for no come-backs.
You're welcome, B-Train and agree - the legacy three and four speeds were a lot less complex from a command and control stand point and flat-raters couldn't care less (ive rebuilt a lot of flat rate jobs from customers trying to save a buck).
So it was just low fluid for you?
