If this is a 45 RFE ,545 RFE transmission then the individual selonoids are not readily individually servicable the entire selonoid valve assembly must be replaced . it is easy to do this you only need an inch pound torque wrench (30-250 in lb range) and the service instructions. Basically it is 15 bolts to remove the pan 6 bolts to remove the valve body and 12 bolts to change the selonoid pack you may have to change the TRS plate also if the old one is a black plug and the new one is a white plug but thats easy.
the cheapest one I was able to find was at www.makcotransmissionparts.com about $ 279.00 + 30.00 for the plate.
Just be sure thats what it is the accumulator piston springs are known to break in the valve body on these transmissions and they cause shifting problems that seem like the selonoid(s) are the problem when in fact it is either the accumulator springs or seals or both, and they are super easy to fix and cheap.
had the same problem it was a broken OD accumulator piston spring in the valve body. Just buy a transco SK 45RFE shift kit ($ 45.00 ) it comes with all the accumulator piston seals an updated and much thicker and stronger accumulator retainer plate AND the kit includes a "spare" set of accumulator springs (1 large & 1 small) in case the spring(s) are broken ,which they do from timt to time. It is only 6 bolts to remove the valve body (carefully) and 7 screws to remove the accumulator plate to access the accumulator pistons and springs. The instructions included in the kit are excellent and very straight forword, you won't need all of the parts but save them they may come in handy some day later. DO NOT DO THIS WITHOUT A TORQUE WRENCH IT IS VERY EASY TO STRIP THE BOLTS AND SCREWS, but having said that it is easy to fix and you might as well change the fluid and filters at the same time.
Generally if there are shifting problems and no DTC'S it is an accumulator spring or seal problem. The computer will notice but not react to momentary shifting problems that only occur at the moment of shifting for a moment such as in the case of a broken spring it still works but due to the busted spring it just doesnt work immediately so the computer will notice the momentary input/output ratio error BUT the error is only momentary and when the gear shift successfully completes (although late) the ratio error goes away and the computer sees no other problem so it doesn't register an engine light on. This is also because you would think this is a common condition that the computer should be able to reckognize (and it can) it is a condition that was likely deliberately left out of the P code list as the transmission shops and dealerships need to make money too ...right ?? this is exactly the kind of thing they can tell the owner anything they want about what is wrong with the transmission. even though in reality it is a well known weakness in this transmission series.....Hmmmmmm.
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It depends on which Solenoid it is. If I remember correctly there are 5 in 4WD transmission any one of which might have gone bad. Pricing varies depending on which one you are replacing. When you remove the pan you should see 2 to 3 of them right away. Removing the cover plate should expose the remaining ones. This is a job best left to a transmission specialist unless they have told you exactly which solenoid needs replaced and that has been determined by computer diagnostics.
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