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You are right on the money.
Here are the details: The starter I was grabbing was on an 89 I had on one jackstand, not very high either. And no, I had no desire to spend three hours; the starter was needed on another 89 that same evening, where the 3/8 extension arrangement you saw in the photo had served me well moments before with only a ratchet instead of the breaker bar.
Not really having enough swing to properly use the 1/2" breaker, I exchanged it for the air impact gun - no impact sockets. I turned my face away and gave it a couple tentative braaaps, before coming to the predicted conclusion most of the impact was being delivered to the joints and the universal's pin, instead of the bolt.
Now it did take me fifteen minutes hunting up that box wrench, and another five or ten making room for it, but nowhere near the time it would have taken me to raise things high enough to let the transmission hang down for a straight shot at that bolt. Not in my work area anyway. After such simple success, I snapped the photo thinking it might help someone else to remember the top-access option.
Your question about torque: I treat the ratings I see on impact guns with suspicion, thinking they are mostly unverifiable and used to sell, and possibly quite variable with wear and actual voltage or air pressure available at the tool.
My unschooled imagination envisions this graphical curve of torque vs. time, showing the loosening torque of a starter bolt increasing with time, eventually intersecting a slowly decreasing strength of the bolt.
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Art Benstein near Baltimore
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