TCC sticking

[justabuickv6]

When slowing to a stop, after being on the road for a long time, my tcc won't let go. This only happens when I've been on the road for over a hour. It won't happen on shorter drives. All speeds are over 70 mph. TCC lockup is at 55 mph.

What causes it to stick? I can usually put it in 1st or 2nd manually and it's okay from there on out.

 

[John Larkin]

They just wear out. Replace it. Mine almost stranded me; wouldn't disengage and had to two-pedal it home.