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You don't say whether the starter is continuously cranking the engine or just spinning continuously or whether after starting the engine the starter switches off but remains engaged? Lack of detail makes it difficult to give anything but a general answer.
Certainly the starter should be removed and checked for damage and correct operation. The pinion might be tight on the helix, the solenoid could be tight, the return spring broken or the arm pivot seized. If the starter has been engaged while the engine has run at speed or for more than a few minutes the overrun clutch should be replaced.
In any case where the starter has remained engaged the ignition/starter switch and the drive mechanism in the steering column lock should be inspected for correct operation.
1: Low battery voltage
2: mis-aligned starter requiring shims
3: mis-aligned starter that has to many shims
4: bad engine ground
5: incorrect ring gear, (may have been changed with flywheel during clutch job
6: damaged pilot bushing in crankshaft, or incorect bearing installed during clutchjob
7: the wrong clutch altogether, I've seen that happen before, it may be to large or wrong shape and touches the bell housing, make sure you can turn the engine by hand while someone else completely engages the clutch, if the vehicle tries to move while clutch engaged and you turn the engine, there is a problem that can only be remedied by removing the trans and finding it.
sounds like the sprag clutch has failed. If you can see the large gear that sits behind the rotor and its turning but the rotor isnt turning the sprag clutch has failed. Very costly. usualy you would have a missed start eg not engaging every now and then before this fails all together.
Yes, there is a clutch switch which must be activated (closes switch) for the starter to engage. This is a safety item so the truck won't start in gear. With time it may begin to fail, this should be any easy fix. And yes from time to time you may not be pushing the clutch in far enough to actuate this switch.
I hope this may have helped,
Starter bendix is stuck and not engaging the flywheel. Or the starter gear is engaging the flywheel and the overrunning clutch in the starter is bad. Either way, you are looking at a starter replacement.
I would check the starter clutch its self first. It is a one way clutch so if you remove the starter and disassemble it to the starter clutch and hold the starter clutch in one hand and use your other hand to turn the starter clutch gear, it should only turn in one direction.
engine crank thrusts worn and crank moved back enough to not engage ,with a manual the clutch would push it forewards.or the flex plate on the back of the torque converter damaged and broke in teh centre where bolts to the crank