The parts that move power from the engine to the wheels — clutches, driveshafts, U-joints, axles — wear out over time, and the symptoms tend to creep up gradually. A lot of operators get used to driving around them until something gives. Bring it in early and we'll tell you what's actually going on before recommending anything.
Yes. Full clutch replacement, including pressure plate, disc, throwout bearing, and hydraulic system service.
Fluid service, gasket and seal replacement, axle and pinion seals — yes.