Turbolink and a snap on scanner...
Ok thats a start...I'll be the first to recommend either a scanmaster or a powerlogger..turbolink is ok..but there are much better programs out there right now..scanmaster to get an IDEA of what your engine is doing would be my first choice...
I am little confused..you don't really KNOW what converter you have in the car..nor do you truly KNOW what turbo you have either...so I guess a better question is where to begin...
1st are you experiencing any detonation at all? What cam, lifters are you running?
2nd you really need the I.D. that converter..has the transmission had any work done to it at all? If it hasn't you may want to start thinking about a rebuild..because you are going to have to do it eventually anyways..
A stock D5..will have D5 stapmed all over the converter..
3rd Do you have a stock rearend? That is the 3.42 gears? Yes 3.73's will pick it off the line (assuming everything else is fine)..but why if you have questions on your combination now?
I would worry more about identification and researching what you have..rather than complaining about a seemingly unknown combination that feels "like a dog" off the line...that is simply not a very good observation without more information...you know like "nailing jello"..