2000 chevy silverado 2500 A/T. ok, well i had the issue with my guages, i just ended up re-wireing them in because the feed off the fuse box was putting out bearly any voltage, so i thought that was messing up my truck not shifting. but basicly i have no overdrive or 3rd, well im assuming no third but i may, if i was to go 50 my truck will be rev'd up to around 300-3500 rpm's. now i know people with similar issues have said it could be a ignition switch, now is there a simple way to test/fix a bad electrical part on the ignition switch? also the wire i replaced was the ign 1 fuse box wire.