I know a guy who purchased a SPF from someone that installed a PRO 5.0 himself prior to selling the car. My buddy drove the car before the 5.0 was installed and it drove fine. Now that the 5.0 is in, it doesn't shift worth a damn. I don't think it's a linkage problem because it shifts fine when cold / off. Once you start the car and it gets warm, it becomes very difficult to get into the gears (especially 1st and reverse). The previous owner said that he thinks he may have introduced air into the lines when installing the 5.0 and that he should bleed the lines. I've never installed a 5.0, but I can't see how / why any air would get into the lines. Anybody with any ideas? The car is pretty much undrivable the way it is. My friend is waiting for spring and is hoping to get it fixed at a place near by. No one seems to know what the problem is. I think he got the SHAFT from the previous owner. Too bad, because it would be a nice car if he could only get it into gear.