I removed the two MMC springs (10.0 lbs/in) and replaced them with .....
Setup #3
Primary Spring: Stock OEM Spring
Secondary Spring: McMaster-Carr 5.6 lbs/in, PN: MS24585-1086
Still no joy, it shifted very similar to setup #2 with the two MMC 10 lbs/in springs shown
above and below. The two springs outside the governor in the pic below.
I am in the process of installing the stock original governor now that's been in the car for
several years now. I need to prepare for the NTBA Nationals in Tennessee.
Since I'm pulling the transmission pan so many times, I went ahead and bought a gasket
from Lube Locker. I've used this type of gasket on my Navigator and tightening the pan
against this gasket is easy and not critical about how tight you make it. When the pan
compresses the rubber until it meets the steel, then you can't really compress the gasket
any further. So it keeps you from over tightening the gasket.
They make gaskets for many of the popular differentials and transmissions pans.
https://www.lubelocker.com/