I do my own tuning with HP Tuners. No clue where to send you to have it done.

 

I can however tell you that a cam tends to really throw off the timing map. When I put my 4L85E into my Express I had HP Tuners segment swap in the 4L85E. It put a totally stock engine tune into the PCM. With my 206/210 cammed 350 it was a DOG. Tune woke it right up again. Very dramatic difference between a stock tune and a good tune.

Before

After

 

Pretty big difference there.

 

What size stall is your Circle D?

 

278mm 2600-2800

 

Glad you got it figured out man. I have experienced converter shudder several times, once you experience it you can usually pin point it quickly.

 

Thank you sir, I'm just glad the truck runs well.