1st and 3rd only, no 2,4 or R; sun shell is fractured or splines are sheared off. Transmission must be removed to fix the problem and may have to be rebuilt or replaced.. Try not to run or drive the car or further damage could result.
Slow, slipping or no reverse: “lo-reverse” clutches are worn
out, fluid leak in the reverse apply circuit, or broken sun-shell. It is
possible to remedy a fluid problem by removing the check-ball from its
cage in the case in the rear of the trans may help (must remove valve body), or adding a high-viscosity additive such as Lucas
Transmission additive or other seal restorer product. May also have
worn boost valve (can replace in the pan).
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