TH400 valve body for 1965-1990, OEM and ready to install. Ships fast from the USA.
A GM TH400 that shifts late, flares on the 1-2, slips before the next gear catches, or has a torque converter clutch that shudders instead of locking in clean is almost always telling you the valve body's internal bores have worn past spec. This valve body carries GM's original 22020 part number for this application, remanufactured with updated valves rather than a used core, for anyone rebuilding a 1965-1990 TH400 who wants to stay on the factory part number.
We also stock a TCI-branded remanufactured valve body for this same TH400 application. Both are built the same way - updated valves installed into cleaned, inspected bores and bench-verified before they ship - but this one is sourced and numbered to match the original GM casting, which is the detail some shops and restorers need to keep a rebuild on factory part numbers instead of an aftermarket brand.
The TH400 sets every shift hydraulically, with no computer or shift solenoids involved - governor pressure, throttle valve position, and spring-loaded regulator valves inside this unit decide when the 1-2 and 2-3 shifts happen and how hard they apply. It also carries the pressure regulator, boost, and actuator-feed-limit circuits, along with the TCC-apply circuit on units built with converter lockup. When the bores those valves ride in wear oval, pressure bleeds past them instead of holding, and that's what turns a firm shift into a soft, late, or flared one.
Pull line pressure readings at idle and under load and compare them to the TH400's published range before swapping the valve body, since a weak front pump or a stuck modulator can mimic the same symptoms. Our TH400 common problems and fixes guide runs through those other failure points, and the TH400 delayed engagement guide is worth a look if your main complaint is a pause before the transmission takes off from a stop.
This valve body fits the TH400 as used in 1965-1990 GM trucks, motorhomes, high-performance cars, and the Jaguar and Rolls-Royce applications built with this transmission, but the TH400's casting and valve body bolt pattern changed more than once across that run. Match your current unit's casting and bolt pattern against this one, or give us your year and VIN and we'll confirm the right version. The TH400 parts collection shows every valve body version we carry for this transmission.
Change the fluid and filter at the same time you swap the valve body - circulating old debris through a freshly rebuilt valve body is one of the fastest ways to wear it out again. Follow the torque sequence in your service manual rather than tightening corner to corner, refill with Dexron ATF, and road test through every gear. A filter and pan gasket set covers that fluid service, and if the unit has meaningful mileage on it, pairing this valve body with a TH400 overhaul kit gives the new valve body fresh clutches and seals to work against instead of worn friction material.
| Transmission | TH400 |
| Year Range | 1965-1990 |
| Condition | Remanufactured / updated |
| Shipping | Ships from the USA |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Both are remanufactured with updated valves the same way, but this one carries GM's original 22020 part number for this TH400 application, which matters if you want a rebuild that stays on factory part numbers rather than an aftermarket brand.
It sets every shift hydraulically, with no computer involved, through the pressure regulator, boost, actuator-feed-limit, and TCC-apply circuits plus the 1-2 and 2-3 shift valves.
1-2 shift flare, a harder or softer 2-3 shift than normal, converter clutch shudder, and slipping or no 3rd/4th gear, especially when line pressure checks out low against the TH400's published range.
Yes, on TH400 applications built with torque converter lockup.
Dexron ATF, a fluid and filter change at the same time as the valve body swap, and the torque sequence from your service manual rather than tightening corner to corner.
It covers that span, but casting and bolt pattern changed more than once. Match your current unit against this one or send your year and VIN to confirm.
