You can tell whether an early Chevrolet or GMC starter is 6 volt or 139 ring gear teeth because the starter drive pulls out straight. The armature has straight splines. The 12 volt or 168 tooth ring gear starters have helical splines on the armature and will twist when pulled out.
Also the "exposed end of the starter shaft on the
12V starter will be .470" while the 6V starter has a shaft diameter of closer to 5/8".
ALSO: If the return spring on the foot start linkage is missing/broken/wrong one/weak, that's your problem.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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