Okay so this has me a little stumped. It has a fairly fresh jasper trans, fresh fluid and filter, . Around 45 it starts to buck in a way basically trying to lock in tc and out if I am applying light gas, if the rpm is above 2300-2500 it is smooth as glass, get it up to about 60+ it doesnt do it at all just smooth sailing no matter how much gas you give her. I have functioning cruise control, I am not missing gears or experiencing any slippage else where nor any weird or delayed shifts. I have ran some lucas antislip stuff in it and seems to lighten a little but not much so I am trying to figure out if I should be hunting down sensors or saving for a good t.c. when I changed fluids theres no evidence of shavings in it other then the normal slight wear which the fluid before I changed it was honestly beyond gone as in looked like a century old motor oil with a red tint level gone but smelled like trans. Which trans acts just fine other then that 45+ area