I agree with Guns, I have had this happen to me before also. Do a tune up.

Yes, there are 2 or 3 wires connected to the brake switch. 1 for brake lights, 1 for cruise/PCM. It depends on the platform etc. But when the PCM detects the brake pedal has been pushed, it will automatically unlock the TCC.

Thanks Mike for the response. I am going to check out the wires plugs and dist cap rotor and probably replace them just for good measure anyway since I dont know when they were replaced. Thanks for your input.

It probably needs a torque converter, replaced a trans last year in a Denali for the same thing. Guy wanted it torn right down to see if it was a better idea to just replace the torque or the whole unit, and opted to replace the whole tranny after I looked inside.

I appreciate all the input from everyone on this matter. I did find that when adding the 3/4 quart of fluid that the trans was low that the shudder went away. I have since taken the pan off and did a fluid and filter change finding no large metal pieces in the pan with just the normal wear filings on the magnet. Cleaned it up and it seems fine now. Lets hope that that is all it was. I dont know where that 3/4 qt of fluid went though. No signs of leaking. Guess it just vaporized over time. I do pull a boat with this vehicle from time to time. I have read that this transmission is very touchy about the fluid level being just right. Hope that is all it was. I will let you know. About to take this car on a long trip.

Thanks for the follow up!

I have a 96 PA Ultra...supercharged. Have exact same symptom...all new ignition parts. Interest to see how this problem was solved...

Thanks, Walt

Hi TazzMan. I did solve my problem. But it was only after discovering in the middle of a 1000 mile trip that I did not have reverse gear any longer. I decided to tear down the transmission when I got home with the vehicle (Yes! I made it the 500 miles left to get home with no reverse!!) Anywho to make a long story short I found out that the leak I had of fluid was related to the break down of the bearings of the reverse input drum which finally destroyed the pressure in the reverse circuit due to the failure of the seals on the failing shaft. I did rebuild the entire transmission while I had it out instead of just dealing with the reverse drum. I did in the process replace the torque converter and this may have had something to do with the shuddering I was experiencing. I just do not know for sure if the reverse drum being compromised had anything to do with the shudder I had in forward gear. At any rate the shudder is no longer a problem.