Question about 2004 Pontiac Montana

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2004 Montana shifts hard after being driven for about an hour. It has only occurred once, however, other times while sitting at a traffic light, when I press the fuel petal to go, it slips as if momentarily out of gear...it does catch and go after a couple of seconds. So, I'm going to change the fluid and filter and install a shift solenoid - plus add a bottle of Rislone Transmission Additive. Could the Pressure Control Solenoid also be a part of this problem - or am I just throwing money to the wind? It has 91,000 miles on it. Please advise. Thanks!

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If the transmission has otherwise being acting OK, then I'd think that fluid and filter might take care of it. A shift solenoid might not be necessary, but it can't hurt. The only thing I differ with you on is your choice of Rislone. They make a great product, no doubt, but I've seen worse problems than you've described made to working smoothly using Lucas Oil.

My wife's Montana (01) has roughly the same miles, and it one time hit hard on a 2 / 3 shift while I was driving it.

I added Lucas (didn't change fluid, filter or anything) and it has worked just fine ever since.

Posted on Dec 30, 2010

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