I have a K5 with a 700r4 tranny. It sat for about 9 months because of a bad rear end but I started it periodically to keep all the fluids circulated. I got the rear end in and now when I drive it switches through all the gears but 2-3 revs and then shifts. What could be causing this? I also went from 31's-33's could that do anything? Thanks for any help, it is greatly appreciated.