I changed gears 3.42 to 4.10 about three weeks ago.Drove it out of town ten miles,and was coming back the SES was on!Did the gas cap thing,while i was at it redone a ground wire and put it on battery.Fired it back up,lite off.Guess i reset it.Drove around town &every is fine,untill today when it came on again !Transmission shifts hard 1st to 2nd.Early today i passed a car going 65 barely pushed the pedal and at 70 felt like i had anther gear.10 sec later felt like it whent out of that gear.Whats going on?Did i do something wrong? When i changhed gears i put a e-fan on,could both of this be the resaon?Or somthing else,i think its the new gears. Please Help!

 

If you don't have a HPP3 it will mess up your shift point mph and the computer probably noticed this with the speed sensors or something like that

 

yeah you confused the hell out of your computer
you going to have to adjust it for the gears

 

Well i dont have an HPP3,but i've got a superchips that came with the radix.I'll try that some time this week.I got a jet SCU2000,but i guess i'll still need to adjust the comp.