Summer 1981, and my new-to-me 1972 Corvette roadster was up on drive-up ramps for an oil change. Went smoothly, and I skimmed my Haynes shop manual to see if anything else needed to be done. Ah. the oil level in the 4-speed trans! Unscrewed the square bolt and smelly, OEM gearbox oil poured out. Funny. Shop manuals says it shoud be at drain opening height. Guess they overfilled it at some point. Oh well. Let the 'overflow' drain out and reinstalled the inspection plug.
Two days later, and started having problems shifting in/out of first and third. Ended up at a trans shop and they told me it was toast; too little oil was the problem.
Yeah, i had the car up on ramps at an angle high enough to allow the oil to pour out. Lesson learned..only check trans oil when the car if level. Tuition for this class was no car for two weeks and $1,100 for a rebuilt/used replacement trans.
