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TH350 kicks out of 3rd gear
I've got a 1978 Big 10 with a TH350, 76k original miles. Truck had 60K miles when I bought it a year ago. truck has been babied its whole life. It had 48K on it when my friend I bought it from got it from his uncle in 2007, who owned it since in 1980.
Lately, the transmission is starting to act up. After it is warm, when running in drive, it will go from third to 2nd or 1st on its own. Quickly moving the selector to neutral and back to drive will put it into 3rd gear till it does it again.
Today, these symptoms started while the truck was still relatively cool.
Fluid level has always been normal, no leaks. I changed out the vacuum modulator with one from NAPA with the red mark. Made no changes. Fluid smells burnt. Should I try a fluid and filter change first, or bite the bullet and have it rebuilt?
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