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Well, information posted on various sites have called for FIPL voltage sensing to be at 1.05-1.1 at idle, and 3.8 -4.3 WOT. Mine was set at 1.08, but I wasn't all that happy with the shift schedule, it would kick up a gear sooner than I liked, and would kick into overdrive at about 40mph. This resulted in pretty low rpms, high egts, and doggy performance due to lugging.
When I had my TC changed out due to clutch slipping, the guy at the shop said that 1.2 v was a better setting for the FIPL. I check some old posts here, an low and behold PLC7.3 had referance a TSB that called up 1.2 v at idle.
So not being a coward, I cranked my adjustement up to 1.2, and guess what, much happer with the sifts, doesn't kick into overdrive until 50 mph, and maintains better rpm/power ratio through the range. Hope others frustrated with E4OD performance will find this helpful.
My shifts are just too hard and holds gears too long at 1.2 volts. I've got mine set at 1.05 now and it's tolerable. I plan on doing a fluid and filter change soon and will play with it a little more.