Ford E4OD and 4R100 accumulator springs can break, weaken or collapse, causing long, soft shifts, particularly in towing and heavy-duty applications. Recalibrate shift feel with Sonnax performance rated accumulator spring kit 36948-18K.

Best in heavy-duty and towing applications
Gives quicker and firmer 1-2, 2-3 and 3-4 shifts
Recalibrates shift feel

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