If you mean by screehing noise it is making a loud gear noise, then it would most likely be that the starter is not shimmed properly. Shims come in different thicknesses. If you use three thin shims it could easily be not enough
If it is making a whining noise after it starts, the starter is not disengaging.
Another point to consider is that the starters are correct for the application. If you’re getting the starters from the same supplier, you might try a different supplier.
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You just need to shim it properly.
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If it automatic, could be the flex plate teeth are worn or it's installed wrong. Take all shims out and see if it stops and still starts engine. Wiring not likely. Check teeth on both flex plate and starter gear with the 2 engaged manually with a feeler gage.
Be shure that the flywheel isnt placed wrong on crankshaft. Check for correct application by part nr or shims arent thick enough
SOURCE: replaced a burned out starter in my 78
In the kit of bits and bobs you got with the starter, there should have been a small, round feeler gauge rod just for this purpose. Add/remove shims as needed so that the rod barely slips between the teeth of throw-out gear and starter ring where they mesh together. This can be checked with starter in place, the throw-out gear in the starter nose housing pushed forward and into the ring gear manually. This will require you to leave the trans bell housing cover off to check.
If all goes well, the starter should sound sharp and engage with no whine or grind.
SOURCE: starter wont connect with flex plate on big block
You'll need a starter from a 1993 C2500 Suburban which came with a 454. Assuming you're running a TH400 this should solve your issues.
SOURCE: replacing a starter on a
I have replaced many of those type starters, and almost never need to use the shim. If the original starter was also aking a grinding noise, you may have a flywheel problem. (not good) If he has not tried it without the shim, have him remove the shim and see what it sounds like. He will only have to remove the front bolt, and loosen the rear bolt to remove the shim. Good luck
SOURCE: when starting car starter makes a screeching noise, starter is new
On GM starters,you have to check the clearance between the starter pinion and the flywheel.The usual tool used to determine the clearance is a large paper clip,bend the end out,use a screwdriver to engage the pinion to the flywheel,and see if the paper clip will fit in the valley of the flywheel teeth.Or, just get a couple of shims,and try adding shims until the screech goes away.
SOURCE: New starter, now has high pitched, loud noise
If the starter did not have a shim dont put one in if the start is make the nosie without the shim the new starter is bad (ase)certautotech
SHIMMING
Starter noise during cranking and after the engine fires is often a result of too much or tool little distance between the starter pinion gear and the flywheel. A high pitched whine during cranking (before the engine fires) can be caused by the pinion and flywheel being too far apart. Likewise, a whine after the engine starts (as the key is released) is often a result of the pinion-flywheel relationship being too close. In both cases flywheel damage can occur. Shims are available in various sizes to properly adjust the starter on its mount. In order to check and adjust the shims, you will also need a flywheel turning tool, available at most auto parts stores.
If your vehicle's starter emits the type of noise previously described, follow the shimming procedure below:
Fig. 2: Once disconnected, the pipes should be suspended out of the way using wire or an old coat hanger
Fig. 3: Although usually not necessary, the torque converter cover may be removed for additional access
Fig. 4: Once the bolts are removed, the cover may be lowered from the transmission
Fig. 5: The starter solenoid wiring should be tagged and disconnected
Fig. 6: Various sized deep sockets will make disconnecting the wiring much easier
Fig. 7: Loosen the start mounting bolts
Fig. 8: Support the start and withdraw the bolts
Fig. 9: Carefully tilt and lower the starter assembly from the vehicle
Fig. 1: Check the gap between the starter pinion and flywheel
Fig. 2: Starter motor mounting — V6 (left) engine and diesel (right) engine
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