Re: starter shims
It's probably that the starter was not properly rebuilt and/or has a malfunctioning solenoid or key switch or wiring.....not shims. If you did not rebuild it yourself, ask what was done and what was replaced. Many mechanics know nothing about GMC V6's and treat them like Chevys....with Chevy parts. As pointed out by BBV6, there is much more possible tolerance buildup in the Chevy type mount than GMC. Chevy has up/down and in/out tolerance. GMC has only in/out. (regarding this era)
Starters have an "overrunning clutch" design, they have specific procedures and specs for rebuilding, especially location of the pinion gear. They do not have shims between mounting flange and bell housing, according to my 1960 manual. As stated, no shims, don't use any. Fix what is wrong.
The symptoms you describe point to the Solenoid: Weak return spring, weak electromagnet, binding shift lever, wrong parts, loose wire connection, pinion gear location not calibrated.
Second possible is momentary portion of key switch.
Last edited by AZKen; September 26th, 2015 at 09:11 PM.
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