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Re: 98 lesabre info on pressure control solenoid PSC
When a 4T65E tranny is working right they work great and the shifts are very smooth.
Really hard to say whether the hard shift to 3rd or 4th (OD) is the PCS for sure. It may not be. There are other known problems like the clutch packs and splines. Also, there are upshift solenoids. I know a tranny tech/expert on the forum and maybe he can weigh-in.
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