On RE4F02A units, be sure to compare I.D., O.D., depth, overall length and feed hole locations.
Vehicles with Jatco/Nissan RE4F02A or RL4F02A transmissions often have problems with poor shift timing and poor line rise. This can be caused by the reciprocating pressure regulator boost valve wearing the inside diameter of the boost sleeve. As this wear increases, pilot/boost pressure, which enters the sleeve, leaks past the valve and exhausts, resulting in poor line rise. Sonnax pressure regulator boost sleeve 93990 eliminates the above problems.