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Originally Posted by ModMech
Flush the Trans, and use Mercon V fluid. The Torque Converter is "shuddering", a flush and re-fill will usually cure this but you MUST use ONLY Mercon V ATF.
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Check your owner's manual before you put Mercon V in, 1998 was a crossover year for Mercon to Mercon V and the Ford application chart shows some 1998 models with the AX4S (AXODE) transmission taking Mercon and some taking Mercon V. Also check your fluid level, could be low.