...could be in your clutch! And You might check the tightness on ALL 'Halfshaft' bolts. A 'shudder' could be caused from the clutch disc becoming too thin, wearing unevenly, or spring(s) broken/missing. Also oil on the disc/pressure plate. Could be as simple as the clutch NOT being adjusted properly. Many things can cause it, even as far off as the rear brake(s) or E. Brake staying locked even just one sticking locked just a little! Good-Luck!...
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