transmission

Hello, has anyone changed a clutch out of a Sonoma? I am confused on wether or not I need to remove the shifter out of the transmission before I drop it. Does anyone know the significance of putting the shifter in third before removing it? Thanks,

I have a 2000 Sonoma with 77,000 miles on it. If I drive it for more than 30 minutes it starts shifting hard. If I turn off the engine and restart, it shifts fine for awhile. Any ideas on what's causing this? Thanks

My 2003 Envoy has 115,00 miles, on 3 different occasions it has shifted from 2wd to 4wd on it's own just as if I turned the switch. I have changed all the drivetrain fluids - transmission, transfer case, Also, each time this happened I was moving very slowly (parking) and making a very...