Pdi/ I shift fine tuning

I have a 2010 peterbilt with an I shift. I took my truck to pdi ( performance diesel ) and had all the emissions removed. They replaced the Ecm,turbo,exhaust manifold etc. ( big Boss package ). With all the work to the motor, they never changed any of the perimeters in the transmission. Now it shifts like crap. Called customer service at pdi and they could care less. Has anybody experienced the same thing or can someone suggest where to bring this thing to get the motor/transmission tuned in together? I live in central Michigan. Any help would be greatly appreciated. Thanks

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