Re: 2 Speed power-glide odd shifting.
I'm hoping for you that it's just a fluid level issue. A year or so ago, I was fighting some significant leaks on my powerglide. Anyway, a couple of times I went to drive it and it would behave as you describe. I checked the fluid, which was a little low....added fluid and problem was solved.
I'm not claiming that you have a leak, but I'm assuming the radiator was pulled when the motor was taken out....meaning the transmission cooler lines were disconnected.
Unless someone put in a PG from an older model, you should have an aluminum version.
Also, the aluminum PG's do have a vacuum modulator. It's located on the drivers side at the rear of the transmission.
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 1967 Chevy C-10, 250 L6, Powerglide, 3.73, SWB, Fleetside
Upgrades: Power steering, Offset air cleaner, Rear Sport bumper, 3 point safety belts, HEI, -1/-2 springs, 16x5 wheels, McGaughy's disc brake conversion, Sway bar
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