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Home >> GMC >> 1987 >> Forward Control 7.4 W, Standard >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - THM 400 >> Component Disassembly & Reassembly >> Control Valve Assembly >> Inspection

Control Valve Assembly: Inspection

Clean and inspect all parts. If burrs are present on valves, remove with a fine stone. Use care not to round off shoulders of valves. Ensure valves slide freely by their own weight.

NOTE: DO NOT  remove Teflon oil seal from front accumulator piston unless seal ring needs replacing. Service oil seal ring is cast iron.