i have a 03 chevy dmax and today for the first time me and a friend were driving down the road and he said mash it so he could here how it sounded with the exhaust. i put the peddle to the floor and the rpms jumped to 3500 downshifted then didnt shift again till i lifted. any ideas why it would not shift when its suposed to i bought it used with 72000 on it. is the trans slippin that bad? or somethin else

 

Well if I understand what happened right i would first start with the fuel filter. I dont see a programmer of any kind in your sig so i would doubt its slipping.

Justin

 

no codes?

 

no codes so far and no programers in the truck is stock except for the exhaust

 

Then i would try changing your fuel filter. before i changed mine a while back it would wrap up to 3300 in 4th and not shift until i let out. Trans tables are based of throttle position, speed, and rpm so if your not meeting the speed for that throttle position its not going to shift.

 

yes change your fuel filter mine did this it was like i only had half trottle changed the filter was like new again

 

ok thanks ill do that this weekend and see what happens

 

Have you changed the trans filter, should do it every 10k-15k?

 

just got the truck about 6 monts ago wanted to get the trans servied but havent had the time

 

trans filter takes maybe 2 minutes to change, just finding a cheap trans filter is hard