Yesterday I took my Blazer for its first test drive around the block with the 454. Before I removed the 350, the tranny was working perfectly. Now, if I just shift to "D" and drive, it will stay in 1st gear all the time. I have to shift to L1 and when I want it to shift, move the lever to L2 and then to D. What's going on? I checked ATF level and it's OK. The kickdown cable is disconnected because the old bracket didn't fit the new manifold and the new bracket hasn't arrived from summit racing. I made sure the kickdown cable was not in the "pulled" position. I also connected the vacuum line properly. Any ideas? Thanks.