i was really impatient with mine when i did it, just took the selnoid off left the gers on the car and all the crap inside fell out like the rod in the middle, i spent a good half hour figuring out how an electric starter works, just took the selenoid off of new starter, put it back on the car, works like new.
figure i'll change it when i pull tranny after my TC or flexplate goes, whichever comes first.