[V8] Newbie with Transmission woes need input from the pros

[Tdehoff at aol.com]

Dear Sirs:

I have a 1990 V8 that has developed what I believe is a transmission problem. 
 What is happening is this.  Under moderate to heavy acceleration there is a 
shuddering of the car while it is in low gear.  I almost want to describe it 
as a slipping sensation but I don't feel any loss of acceleration.  If you take 
off with a very light foot you do not feel it.    

There are 50,000 miles on a new transmission, the ATF level is fine and it 
does not have any odor to it.  

What are the commonly known issues with the Automatic transmission in these 
cars?  I am constructing a test light to pull the codes.  I guess I like to 
hear what the most common aliments that people experience with the transmission.  

Tom 
1990 V8 
1986 VW synchro with 300K+