I have a 81 ford f250 explorer 4 speed manual what would cause hard jerks when i go in reverse all other gears are ok but it sometimes doesnt want to go into third gear .. any ideas?? i dont want to b and i checked ****** fluid and diff fluid and rear end all fluids are okay and i also have a problem with the brakes .. recently replaced the master cylinder and booster becuase if went bad but now fluid leaks out from the top and over flows down the side .. its not over filled it just puts fluid from front part of master to the back part which causes it to over fill back there if you can give me some help would be great thanks guys

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That is most likely a clutch engagement issue, it is chatter.
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