Car wont go over 40mph

fill up the transmission oil..
with a little luck that was it...


Checking your Car Fluid Levels

check your fuel pressure and oil pressure as well as oil pressure sender

I the engine ran completely out of oil, the engine has been cooked and is probably locked up from the friction between unlubricated metal moving parts. Also may have spun bearings which means the main or rod bearings stacked on top of each other causing the engine to lockup. If you ran the engine without oil until it quit you will probably need a new engine.

transmission shift control modual it tells the car when to shif gears

these truck are known for an ignition modual located behind the coil packs

possible fuel pressure regulator leaking high pressure fuel into attached vacuum hose

It could be the security system or maybe a crank sensor.

could be one of a few things,
but firstly the running at 40mph is a safety feature to stop you damaging the engine.
I would guess low oil level, or blocked oil filter.
Does it run at a higher temp. when doing 70 mph for a while, or is it running warmer than normal, that is an indicator of low oil level.
I hope this helps

My car is not going over 40mph and when I drive it doesnt want to shift to 4 gear also last month when I took it for an oil change they said the transmision fluid was leaking minor problem but it has enough fluid in.and it does have a smell when I turn the vehicle on

I would start with an oil change using proper weight, filter and oil drain plug crush washer. wrong weight of oil can definately cause the issue.