Starter Replacement?

These s-10s' have two different types of starters. It sounds like the starter you have in the truck has either the wrong size teeth or the wrong tooth pattern. Also I would get an AC Delco unit Be careful if you change out this starter--remember to put the shims back in and go from there. This guide can help you fix it with instruction below to help you with your truck.

https://www.2carpros.com/articles/how-to-replace-a-starter-motor

Check out the diagrams (Below). Please let us know what happens.

I have taken them out by rotating the starter to a vertical position, then thread it down through the opening behind the exhaust system. The other option is to remove the motor mount bolt and jack the engine up a bit to get more room. The second way is easier.

ALL EXCEPT "T" & "U" SERIES 1. Disconnect negative battery cable. Raise and support vehicle. Remove starter braces and shields (if equipped). Disconnect electrical wiring from starter solenoid. 2. Remove starter mounting bolts. Remove shims and note arrangement for reassembly. Remove starter. To install, reverse removal procedure. Ensure shims are installed in original location. Tighten bolts or nuts to specifications. See TORQUE SPECIFICATIONS table. NOTE: If shims are installed between starter and engine, note and record the arrangement for installation reference. Page 1 of 1 STARTER REMOVAL & INSTALLATION -1992 Chevrolet S10 Pickup 9/1/2008

STARTER MOTOR REPLACEMENT

Remove or Disconnect

Place the vehicle on a hoist.

Negative battery cable.

Starter Motor Mounting On The 2.5L Engine

Brush end mounting bracket on the 2.5L engine starter motor.
Solenoid wiring. On the 4.3L, raise the vehicle halfway on the hoist, and reach through the right wheel well.

Raise the vehicle.

4 Wheel Drive Vehicles:

Four bolts on the skid plate (if equipped).
Skid plate (if equipped).

Bolts and the two brackets holding the brake line to the crossmember.

Crossmember (three bolts on each side).
Bracket holding the transmission fluid cooler lines to the flywheel housing, brace rod to the flywheel housing and/or the lower flywheel housing if necessary.

All Models:

Two bolts holding the starter to the engine.
Starter and the shim (if present).

Don't worry, they all have their tough issues.

When necessary for access from underneath the truck, raise and support the vehicle safely using jackstands.

Disconnect the negative battery cable.

On some vehicles access to the wiring may be easier from above. Before raising and supporting the vehicle, check to see if the solenoid wiring is accessible. If so, tag and disconnect it at this time.

On 2.5L engines, remove the brush end mounting bracket from the starter motor.
Tag and disconnect the solenoid wiring.

If the wiring is difficult to access with the starter installed, remove the bolts and partially lower the starter for access to the wiring. If this is done, be careful not to stretch or damage the wiring.

If not done already, raise and support the front of the truck safely using jackstands.
If equipped, loosen the retaining bolts and remove the skid plate.
Remove the retainers and the brackets holding the brake line to the crossmember located just behind the oil pan. Reposition the brake line slightly in order to clear the crossmember.
Remove the crossmember retaining bolts, there are usually 3 on each side, then carefully lower the crossmember and remove it from the vehicle for access.
As applicable and necessary, remove the bracket holding the transmission fluid cooler lines to the flywheel housing, brace rod to the flywheel housing and/or the lower flywheel housing.
Remove the starter-to-engine block bolts. When removing the last bolt, be sure to support the starter to keep it from falling and possibly injuring you.

On some vehicles, even with the crossmember removed clearance for starter removal is tight. As the starter is lowered, it may be necessary to rotate it upside down in order for the end to clear the motor mount, then lower the nose behind the bell housing and rotate it back so the solenoid is on top and the starter may be removed.

Carefully lower the starter and shims (if equipped) from the vehicle.

To install:

Position the starter in the vehicle (along with any shims which were removed) and support while threading the starter mounting bolts. Tighten the starter mounting bolts to 30-33 ft. Lbs. (40-45 Nm).
If removed, install the lower flywheel housing.
If equipped, install the transmission cooler line bracket and/or the brace rod to the housing.
Install the crossmember to the frame and secure using the retaining bolts.
Carefully reposition the brake line and secure to the crossmember using the retaining brackets.
If equipped, install and secure the skid plate.
Remove the jackstands and carefully lower the truck.
For the 2.5L engine, install the brush end mounting bracket.
Connect the solenoid wiring as noted during removal.
Connect the negative battery cable.

That purple wire at the starter solenoid, should be hot with key in the crank position. If it isn't, backtrack the circuit. The voltage comes from the ignition switch through the clutch to the starter.

Below is the replacement procedures for the rear wheel drive truck. If your vehicle is equipped with four wheel drive just let me know.

REMOVAL:
Disconnect the negative battery cable.
When necessary for access from underneath the truck, raise and support the vehicle safely using jackstands.
On 2.5L engines, remove the brush end mounting bracket from the starter motor.
Tag and disconnect the solenoid wiring. If the wiring is difficult to access with the starter installed, remove the bolts and partially lower the starter for access to the wiring. If this is done, be careful not to stretch or damage the wiring.
Remove 1 of the starter mounting bolts, then support the starter and remove the other bolt.
Lower and remove the starter from the vehicle. Be careful, as the starter is heavier than it appears.
Note the position of any shims, if used, for installation purposes.

INSTALLATION:
Position the starter in the vehicle (along with any shims which were removed) and support while threading the starter mounting bolts.
Tighten the starter mounting bolts to 30-33 ft. Lbs. (40-45 Nm).
Engage the starter solenoid wiring as noted during removal.
On 2.5L engines, install the brush end mounting bracket.
Connect the negative battery cable.

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Look for a bracket on the other end. Also disconnect the battery and then the electrical cables going to the starter