1st clutch slips-
If clutch is in decent condition and adjusted correctly I suggest increasing the spring pressure. I use shims i make on a lathe that go under the clutch springs to boost pressure.
note I have to do this with a new clutch with performance springs as well, its a solution to the weak clutch design. currently using approx a .3" spacers.
2nd clutch drags when released-
Before you install clutch side cover operate clutch and watch opperation of pressure plate it should rise evenly from the clutch plates if not spring pressure if uneven and will cause drag. (pressure plate is partially draging on clutches} I will add necessary shims to equalize pressures under bolts (setting spring height)
Also you might have a incorrect lever perch combo not giving enough throw to release well.
And with all the above eventually I will need to readjust the equalization of the springs as it will start to drag again. But then I am real hard on the clutch or torque converter I call it. They can take quite a good amount of abuse.
I am currently running Mobile-one 0-40 one of the reasons for the need of higher spring pressure. but a real smooth opperation when it works right.
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