I see dark area as if it slow leaking. How often does this have to be changed?

Around 15 minutes after starting my truck, when turning around slowly or reversing, the rear wheels vibrate and feel as if they were stuck or braking. It does the same if I'm going uphill, and it's easy to notice how they vibrate and "jump" around. The cardan, differential, brakes and discs were checked, but the problem is still there.

When I accelerate a little hard there is a thumping noise, but there is none if I do it slowly. I already changed the bracket where the wheels are attached, the differential was checked and everything seems alright. Somebody told me it might be the gearbox mounting, could it be?

Okay the truck doesn't want to run right it's like it's got no power you can feel it misfire your kick in and off I've got a new ECM I got a new injectors I got a new coil packs I got a new tank I got a new fuel pressure regulator I got a new fuel pump I've got new coil packs new spark plugs cam sensor crank sensor the differential pressure feedback sensor throttle body positioner sensor all this has all been put in here pretty much all new stuff even replace the wiring harness from the ECM out to the engine plug and play can't figure out why it doesn't want to run down the road very good it'll be fine unless it's an electrical issue