New to auto trans, need advice on my C6

Being that I am European I have no experience in troubleshooting automatic transmissions... Obviously the one in my Torino is acting up and I would need some hints on what to do with it: the selector works fine, it shifts easily through all options, although if I am in park on my driveway it does offer some resistance to get out of park and into reverse and eventually does let go with a bit of a "clank". One in D it takes off properly but will not shift, I can however select first or second gear manually but third never engages. If I go back to D after manually selecting second it just stays in second but eventually goes back to first if I slow down to a stop. If I really floor it in first second will engage but with a pretty definite jolt. 

not sure but possibly the shifter cable needs slight adjustment it may be going into gear on the column selector but not actually engaging it in the correct spot on the transmission selector so it might not be full engaged in Drive. If not you might have some worn clutches in your trans and time for a rebuild which I leave to the professionals

My '76 with a C5 would consistently pop out of Park. If I was on a hill and wanted to make sure it was going to be there when I returned, I would put it in Park, hold it there, let the car roll back a bit (to lock it in) and then engage the emergency brake. This is extremely hard on the Parking pawl and I rarely did it, but it made sure the car stayed put. Even after a rebuild, it still did the same.

The emergency brake should be applied before you let your foot off the brake in Park in order to reduce the pressure on the Parking pawl and ease the effort in shifting out of Park when leaving.

Sounds to me like it could be a modulator problem. Might be simple as a vacuum line left off, hooked up in the wrong place or replacing a bad one. They will shift hard and late with a problem in this area. How it shifts out of park is unrelated to the running problem.

Skinnys Garage wrote: Sounds to me like it could be a modulator problem. Might be simple as a vacuum line left off, hooked up in the wrong place or replacing a bad one. They will shift hard and late with a problem in this area. How it shifts out of park is unrelated to the running problem.