Hey guys hopefully someone can help me out on this issue I have. I recently swapped in a 5.3 in my 1994 C1500 W/T. It had a tired 4.3 in it. The motor turns on, is healthy but I am having trans issues. I moded the oem engine harness with emissions deleted and wired it up using lt1swap.com as well as having Brendan from that website remove the VATS. I am using my 1994 trans (because of funds) and he also deleted the PWM from the pcm because the 1994 trans does not have it. Before I found out he deleted the PWM, I changed the internal harness of the trans to that of a '96 and later because it has an extra pin in the plug for the PWM (I still have the original one). All my gauges work including the speedo ( I have no tach from the factory though). I have checked the trans fluid level and it is where it should be at operating temp. Now here is the trans problem. When in OD or D it does not start off in 1st gear. Instead, it starts off in 2nd gear then when you think it should shift to 3rd, it shifts to 1st. It stays in first and does not shift until I slow down to a stop then I can take off again but in 2nd. If I go to L2 or L1 its in 2nd gear all the time. Reverse works fine. I have the OBD 2 plug and hooked up the scanner and no codes even after I drove it locally for about an hour. But then again, since its a weekend driver, and for antitheft reasons, I disconnect the positive terminal and the fuse for the power on the harness. Please help !!