I am about to pull my hair out with this one. Have any of you seen a transmission cause false knock only in 2nd gear??? I can hear a whine in the transmission at about 4,000+ in second gear. At 4,400 I start seeing knock retard that quickly peaks 8°. I can slightly reduce the "knock by retarding the timing to rediculous values but not eliminate it. I made a run from a standing start to better than 90 mph and practically no knock in 1st or 3rd gear but massive amounts in 2nd that vanishes quickly after a WOT 2-3 shift, despite the engine being under more load, with more timing and less rpm.
Prior to the 0411 swap I ran a LT4 knock module and rarely ever saw knock retard even with 26-28° total advance.
Edit---This was meant for the OBD2 board...Darn phone.