Sonnax oversized solenoid regulator valves 36947-14 and 36948-22 and their tool kits salvage worn valve bodies and restore proper solenoid regulator valve (SRV) circuit function in both early- and late-style Ford E4OD and 4R100 units. Bore wear at the SRV reduces oil supplied to the shift, TCC and coast clutch solenoids. This regulated pressure also feeds the intermediate or center support area. The '96-later valve bodies incorporated a two-spool anodized aluminum valve that is prone to flaking of the anodize layer, causing premature wear of valve and bore. The '95-earlier have a three-spool steel valve that wears the bore, resulting in excess clearance when hot.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.