Hey that is a cool trick. It at least allows you to isolate the modulator out of the equation, which is what's standing in the way of determining if your rebuild is suspect.
Governors are easy to rebuild by the way. 4 bolts and the thing will turn out of the side of the case. It's at least worth checking to see if those counterweights gets stuck the farther it spreads out, which would indicate it's not operating properly at higher RPMs, or where 3rd gear might be!
Good luck.
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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