Th400 transmission tech manual


















Remove the oil-pump-to-case bolts; there may be either 6 or 10 bolts, depending on the year of the transmission. Using a slide hammer, remove the oil pump from the case. Loosen the nut on the end of the manual shaft. Remove the retaining pin for the manual shaft, and slide the manual shaft out of the case. You can now remove the transmission linkage and parking pawl shift rod from the case.

Remove the speedometer gear-housing retaining bolt and retainer. Pry the speedometer gear housing from the case. Note that I have installed the end of an old speedometer cable to pry on it to avoid damaging the threads.

Get a firm hold on the input shaft and pull the forward clutch drum from the case. Remove the direct drum from the case. It can be difficult to get a good grip on it; the outer snap ring and clutch and steel plates can be removed if needed left. You can use two hooked screwdrivers to remove it right.

The band can now be removed from the case. Check the condition of the band lining and the surface on the drum where it applies. With a large screwdriver, remove the intermediate clutch retaining ring, backing plate, and clutch pack. Remove the center support retaining ring, center support, and backing spacer ring not used on all models. Remove the outer shaft that splines into the sun gear. Remove the thrust washer backing spacer left and low band right from the case. Pull the downshift solenoid electric connector from the case.

Use care not to damage the unit. Use a small screwdriver, if needed, to depress the retainers. Remove manual shaft from the case. Use a large flat-tip screwdriver to pry the manual shaft seal from the case. Use care not to damage the bore around the seal. Remove the parking pawl spring. The case is now stripped down for cleaning. A power washer removes heavy deposits from the case.

Soaking it with engine cleaner or a heavy-duty degreaser helps the process. Electronics Shift Kits Valve Bodies. Electronics Filters Pistons Valve Bodies. Filter-Gasket Kits. OEM Piston Kits. Pump Assemblies Pump Parts. Single Clutch Plates. Single Steel Plates. Technical Service Manauls. Rebuild Kits. Technical Repair Manauls. Hard Parts Valve Body Parts. Hard Parts.

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