Transmission Issue, Shifting problems 2001 Dodge Ram 1500 4X4 5.9l V8

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When accelerating the transmission shifts late or does not want to shift at all. I have to let off the gas at times, have the mph drop and then accelerate again to have it up shift. There have been times were the truck will shake while trying to shift. Downshifting is also a problem. A lot of times I have to really brake hard to get the transmission to down shift. When shifting into gear the truck always makes a clunking sound. Gas mileage is horrible.