Re: 4R100 Delayed 1-2 upshift
There is no 1-2 shift solenoid, nor is there a 2-3 shift solenoid.
You could have a problem with the 1-2 accumulator valve. That's located in the accumulator body inside the pan, and the front.
Former Ford Automatic Transmission Engineer
ďThe good thing about science is that it's true whether or not you believe in it.Ē ― Neil deGrasse Tyson