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7A216 is a detent aka shift gate, tab on shift lever rides against it. When tab and/or detent wears, shift lever can pop out of park, and...
You may have to wiggle the shift lever to get the truck to start in park and/or neutral. 3 C1TT-7A216-A detents available NOS
The hole in the 7228 shift collar where the roll pin fits thru it...can become elongated. Shift lever wiggles. 2C0DZ-7228-A A/T shift collars available NOS
The end of the shift lever fits into round hole in the 7212 shift tube. When the hole becomes elongated, the shift lever will wiggle around. 4C3TZ-7212-A A/T shift tubes available NOS