I 'm going to order some 4.10 gears tommorow and found a place to install them for $200.00, i'm just wondering can i drive my automatic gt around with just the gear change until i can have the ecu reflashed, or will the car not shift right? I know the speedo will be affected until the relash, but what about the shifting of the tranny, will the 4.10 gears mess up my tranny without having the reflash done to adjust for new shift points. I just don't want to mess up my tranny, i know i should have all this done at once but i can probaly come out in the long run having the install and reflash done seperately. How much is the average reflash for having gear change, just curious? Thanks for any info.