TH400 valve body for 1965-1990, remanufactured and ready to install. Ships fast from the USA.
A full-manual race valve body gives up automatic shifting entirely, and that is more than most street/strip TH400 builds actually want - this TCI StreetFighter valve body shifts automatically like a stock unit when you leave it alone, but lets you grab and hold any gear by hand when you want it, on the same forward shift pattern your current shifter already uses, covering the TH400 as used from 1965-1990.
A stock TH400 valve body sets every shift point from governor pressure and throttle-valve position, with no way for the driver to override it mid-run. This StreetFighter unit keeps that automatic logic intact for normal driving, on the standard P-R-N-3-2-1 forward pattern, but opens a manual path through the same valve body so you can hold second through a corner or force a downshift for a pass without the transmission hunting for the wrong gear on its own. It bolts in behind the existing shift linkage with no shifter or cable changes required, which is the main thing separating it from a full-manual or trans-brake valve body.
If you need full manual control of every shift with no automatic fallback, our full-manual reverse-pattern valve body is built for that, and if you need a trans-brake for staging against the converter, our billet trans-brake valve body adds that circuit instead of this street/strip unit.
This valve body covers the TH400 as installed in 1965-1990 GM trucks, motorhomes, high-performance cars, and the Jaguar and Rolls-Royce applications that also used this transmission. The TH400's casting and bolt pattern changed more than once across that span, so match your current valve body's casting and pattern against this one, or send us your year and VIN, before ordering. The TH400 parts collection has the rest of what we stock, including the full-manual and transbrake versions if a street/strip valve body is not aggressive enough for your build.
Drop the pan and inspect the separator plate and check-ball locations for debris before bolting this in, and change the fluid and filter with a fresh filter and pan gasket set at the same time so old debris does not circulate into the new valve body. Torque the bolts in the sequence called out in your service manual, refill with Dexron ATF, and confirm both automatic shift points and manual override hold correctly through every gear on the road test. A unit running hard at the track benefits from a racing overhaul kit for fresh seals and clutches behind this valve body, since manual holds and hard shifts load the friction material harder than normal street driving.
| 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. It shifts automatically on the stock forward pattern like a factory TH400 valve body, but also opens a manual path so you can hold a gear or force a downshift by hand when you want to at the track.
No. This StreetFighter valve body has no trans-brake circuit or staging solenoid. It is built for street/strip driving with manual override, not for staging against the converter.
No. It bolts in on the standard forward shift pattern and works with your existing shift linkage, unlike a full-manual or reverse-pattern valve body that needs an aftermarket shifter.
A full-manual valve body removes automatic shifting entirely - every gear change has to be made by hand. This unit keeps automatic shifting for normal driving and adds manual override on top of it.
It covers that production span, but the TH400's casting and bolt pattern changed more than once over those years. Match your current unit's casting against this one or send us your year and VIN to confirm.
Change the fluid and filter with a fresh filter and pan gasket set so old debris does not circulate into the new unit, and consider a racing overhaul kit if the clutches behind it haven't been refreshed.
