Hoping one of ya'll can help me pinpoint something. I've got a 2009 Access Cab, TRD, SR5, V6, 4wd. Bought it from a Toyota dealer certified used last year with 42000 mi and now at 50000. It's really clean and doesn't show signs of a rough life with previous owner. In fact, spoke with him and he maintained it pretty well.
I have noticed a "bump" or feeling of “slack being taken up” through seat and gas pedal when taking off from stop. Same thing is felt just as truck comes to a complete stop. It feels like something loose or slack somewhere in driveline. I know this sounds strange, but it seems to start occurring only after truck has been driven a while and is up to full temperature. Particularly noticeable and feels more severe in stop-and-go traffic every time truck stops or starts moving. It has the Toyota Certified warranty on it and I've taken it to 2 different dealers a total of 3 times with the same verdict - "it's normal". I have the feeling that something is loose somewhere but am repeatedly told it's normal. One guy told me it was slack where the driveshaft joins together. Another told me it was leaf-spring flex.
Has anyone else experienced this? Or can anyone advise as to what the cause might be?