running 4.10's on auto trans if you go through the gears slow then when it is in 3rd at 30mph mash it it seems to slip but only when i have a load normal or not thanks..

 

By slip, do you mean the RPM's jump up real fast and the truck doesn't go anywhere and then when it hits the next gear it pulls? If so, then that's because it probably shifted back to first and first gear's max speed is 30.

 

yes exactly but when it is hauling a load and i do that the r's go up with no acceleration and when it shifts it's sort of sloppy eather way for the 1's time in my life i bought a warranty. thanks