Have a 03 Silverado ss with new converter and getting the p0894 code. I did some logging engine rpm vs trans input rpm and that showed about 300 to 500 difference causing the code. The truck drives fine doesn't feel like it's slipping. My question is how is the input shaft speed generated I know of no sensor I may be wrong and seeing the difference would I be correct it saying it is the converter slipping? Or is there any thing I can scan to help me narrow down converter or trans slip. Thanks