Shifting hard!!

[rifsm1]

I was driving my car home from work this morning and as I was going up a hill it started shifting hard, then it did it again on the flat road and as I was backing in the drive there was a buzzing noise that seemed to come from under the shift column. My car is a 2000 Firebird and this is the first time I've had this trouble and am wondering if the tranny is going out?? anyone have any ideas????

[Jeff_in_Atl]

I was driving my car home from work this morning and as I was going up a hill it started shifting hard, then it did it again on the flat road and as I was backing in the drive there was a buzzing noise that seemed to come from under the shift column. My car is a 2000 Firebird and this is the first time I've had this trouble and am wondering if the tranny is going out?? anyone have any ideas????

That buzzing is a shift solenoid malfunctioning. I believe you can scan the car and it will give you a transmission error code. Those solenoid are like $20 but you have to drop the pan to get to them. As to which one is bad I have no idea.

[Christopherrr]

There are two of them I believe (but something tells me three)...you'll have to drain, drop the pan, remove the filter to get to them.

Not a hard job...just messy. One controls 1-3 shifts and the other 2-4.

I can't remember, but that buzzing noise could also be the TCC valve sticking.

Try flushing the tranmission system out with new fluid...you can't just drop the pan, you need to the old fluid out of the torque converter also, dropping the pan won't do it, and getting a new filter.

If all 4L60E are the same then that should cure it for awhile...

What's really causing all the hard shifting is hot tranny fluid. When it gets hot, it gets thinner...your PCM notices the thinning fluid and increases shift pressure to compensate...thus hard shifting.

If you want a permanent fix, replace the shift solinoids, tcc valve, fuild, filter and get a tranny cooler. Then your Tanny will be happy.

[rifsm1]

thank you

thanx for the help