It seems lately that my tranny shift into 3rd and 4th really quickly. It shifts very smoothly but seems like it will shift into 4th like at 35-40 and it seems to kill the power . Does it sound like the torque convertor? I changed the tps prolly 2 months ago and it seems the truck just doesnt have the same UUmmph that it did. It just seems the tranny shifts early. Any thoughts? I am running 355s