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Was thinking all four solenoids and the MPS Independent transmission shop told me most replacement solenoids made these days are poor quality......

10-4!

Local shop did a second trans service this AM with new filter and seal...I did 20 stop and starts and 1st gear came back on about half of those, and I was able to downshift to 1st half of the time.....Spoke to the GM tech (small town, both close to each other) and he still wants to pull the side...

Thank you, sir....!

Thank you, the original shop is installing a new seal on Wednesday, fingers crossed..

Four weeks ago, transmission serviced at 56,700 miles with STP fluid and AC Delco filter. Next day experienced intermittent long 1-2 shifts, at times revving between shift, 2nd gear starts, and later at highway speeds TC failure to lock up. GM transmission tech advised to disconnect battery for...

Thanks for the detailed update Can only imagine the frustration you must have........

Did the BCM solve the problem