Thread: To change trans fluid or not?

Drop the pan and change the fluid and filter. Then install a shift kit if you feel like it. It's not a necissity per se. At that mileage do NOT flush it, or you will most likely experience what you did on your wife's montana all over again. I personally don't flush higher mileage trannys just for this reason. You dislodge something in the trans. that was either holding it together or that junk gets stuck somewhere it shouldn't be and bam- new trans.

This most likely will not help your RPM occillating issue. IIRC this is more a cause of the TCC solenoid. Check out Dave's website at tripleedgeperformance.com and read about this issue. FWIW, mine does the same thing. I just don't let it do it via throttle input. Starting to get it in 3rd as well.

For a cheap (free) fix, you can try this-- Disconnect BOTH battery cables then touch them together for 30 seconds, then leave them both disconnected overnight. Then reconnect and take it for a drive and let the ECM relearn. It may run wierd for a few miles so be gentle on it. No WOT runs, lol... See if that takes care of the RPM bouncing.

Oh, and when you drop the pan, REUSE the stock pan gasket. They are meant to be reused assuming there is no damage to it. Don't use the cork or rubber junk that will come with the new filter. No RTV necessary.