No 1st Gear Or Slips In 1st Gear

Low line pressure. Oil feed tubes broken, bent, plugged or leaking. Pressure switch assembly "O" ring leaking. 1-2 shift solenoid failed off or leaking. 1-2 shift valve stuck in upshift position. 2-3 shift solenoid failed on or exhaust is plugged. Channel plate and gasket misaligned, damaged or fluid restriction. Fluid leak across channels. Manual valve or shift linkage is misaligned. Forward clutch piston assembly cracked, leaking or binding. Forward clutch inner seal and sleeve plugged. Forward clutch housing cracked or feed holes plugged.

Clutch friction plates worn or splines broken. Snap ring out of position. Forward clutch housing exhaust check ball missing or out of position. Forward clutch return spring binding. Input sprag or low roller clutch damaged or not holding. Fluid leak or restriction in forward clutch fluid passages. Forward clutch support seal rings leaking, damaged or feed holes plugged. Torque converter stator roller clutch does not hold.