Something you might try is on my truck started short-shift at full throttle if the downshift energizer wire came off the plug. It was a bad plug connection and I would have to jump under the truck and re-attach the plug. I got around to fixing it not sure if I got a new plug and wired it up or replaced the energizer in the pan. but its something cheap to try.
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Jim Moshier
1971 Grand Prix 462ci SD Performance 6x heads
1962 Catalina 389
1968 Firebird 400-455 I haven't decided
"If we ever forget that we're one nation under GOD, then we will be a nation gone under." - Ronald Reagan
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