No 4th Gear Or Slips In 4th Gear

Low fluid level. Low line pressure. Pressure switch assembly malfunction. 1-2 shift solenoid stuck off or leaking. 3-4 shift valve stuck in downshift position. 3-4 accumulator valve stuck. Manual valve misaligned. Misaligned, loose or restricted valve body, gaskets and spacer plate, channel plate and gasket. Transaxle case misaligned, loose, porous or leaks fluid between channels. 3-4 accumulator piston seal leaking. Channel plate or transaxle case porosity near 3-4 accumulator valve.

Intermediate-4th band and servo does not apply or is slipping. Intermediate-4th servo piston broken or binding. Intermediate-4th servo piston or cover seals leaking. Intermediate-4th servo apply pin and return springs binding. Intermediate-4th servo cover broken, loose or leaking. Transaxle case cracked at band seat. Fluid leak in band apply fluid routing or fluid restricted.