Fatigued OEM 3-4 accumulator springs.
This 3-4 accumulator spring re-establishes proper shift feel in these transmissions. This is a duplicate of OEM diesel application 47RE.
In vehicles with 42-46-47RH/RE transmissions, it is common for the 3-4 accumulator spring to fatigue, causing sluggish shifts, or to break. Sonnax offers a specially designed 3-4 accumulator spring 12861-01 to restore the proper shift feel.