The high and low pressure lines that go to your trans cooler are most likely the problem.. PLUS, you need a aftermarket trans cooler if you don't already have one. Shifting is another problem, If you did not disconnect the HKS from the harness the most likely area to look at is the fluid level, but if the fluid is low it should be slow to take off or to shift into 2nd before seeing anything going wrong with OD. BTY< your better off getting a built valve body for the trans and modifying the accumlators over using a HKS
