Thought It Was My Transmission

My 01 supercrew kinda jerks when under load like a slight upgrade. Sometimes at a stop foot on brake it pulses to the engine revolution. Does anyone have any idea where to start. I did put new plugs in it.

The jerk under load could be a missfire.
A little more info on what engine and trans. and mileage might help.
What kind of spark plugs did you feed it.
How about fuel filter and fuel pressure?
Any check engine lights?
MT-2500
On engine pulse does it rev up and down at stop light or at idle?

My truck has a 5.4 think tranny is like a 4r70 or somethink like that. It has 85k on it you never really hear rev up and down but you can kinda feel it in brake pedal at stop.The plugs were whatever came in it factory autolite platinum. Thanks for help

It might be time for a good tune up.
Plugs fuel filter and check TBI for carbon check the ign for good hot spark.
They say they will go 100k without tune up but so will and some will not.
Go over it and check it out. Check the fuel pressure and fuel reg to.
MT-2500

It might be a good idea to get it on a engine capable scanner and see if anything shows up.
A scanner will usually show a idle problem or a cylinder missfire if you have one.
Good luck and let us know how it goes.
MT-2500