Check engine lite on shifts hard then lite goes off and shifts fine

Do your brake lites work? The diagram is shift interlock. Not only check the fuses, check for voltage on fuse circuits, use a test lite. As you can see one fuse is hot all the time, the other goes hot with key on. Might be other issues, the shift interlock was my first thought. Some vehicles have a button you can push to bypass the shift interlock, not sure about yours, then you can shift into neutral? Your owners manual would probably tell you?

The factory makes no sift kit that would go in this car.

need to know why engine lite is on. any part store can check and tell you why its on.

check fluid level and see if the fluid smells burnt and fluid is black

the cable adjustment from the engine to the trans its the one with a square section that goes on the engine side push the metal section in and pull back on the cable then push the gas pedal to the floor that should set it

well if all ur doing is clearing the codes ur not to worried about what the actual problem is so just leave the light on but other then that find out what the code ur getting means an fix the problem an it will stop doing that just cause u clear the codes doesnt mean the problem goes away

Is check engine lite on? If so take to auto zone for code scan and they will give print out of code and what it needs,,,,,for Free

sound's like u need to check the tranny fluid? how many kilomiter's on the truck and the tranny?

It sounds like your input clutch seals are rolling. Is the check engine light on. It could also be the pressure control solenoid could be causing the problem aswell

only a sensor will make your light come on. most auto shops will check it with a code scanner for free. good luck