TH350 valve body for 1969-1986, OEM and ready to install. Ships fast from the USA.
If you are building a 1969-1986 TH350 for drag strip or bracket racing and want every shift to happen exactly when you pick it rather than whenever the governor and modulator decide, this forward pattern full manual valve body takes the automatic shift logic out of the transmission entirely. No vacuum lines, no governor circuit doing the thinking - you select 1st, 2nd and 3rd yourself through the shifter.
A stock TH350 valve body reads vacuum signal and governor pressure to decide when to shift. A full manual valve body removes that automatic logic and routes line pressure to whichever gear the shifter selects, so the driver controls every up and down shift directly. This forward pattern unit keeps the shifter travel in the same order as the stock PRND2L layout, which is why forward pattern full manual valve bodies are the more common choice for street-driven and street/strip TH350 builds rather than pure bracket cars, and typically retain 1st and 2nd gear engine braking rather than giving it up the way a reverse pattern unit does.
Full manual means exactly that - there is no automatic mode to fall back on, so this is a build decision, not a drop-in fix for a tired stock valve body. If your TH350 just needs to stop slipping or shifting harsh in normal street driving, see our TH350 valve body problems and testing guide first; if you are already set on full manual control for a race or strip application and want to understand the stock failure points you are replacing, our TH350 common problems and fixes guide covers the governor, boost valve and bore wear this valve body routes around entirely.
Built for the TH350 as used across 1969-1986 GM cars and light trucks. The TH350 ran multiple case and valve body casting revisions over that span, so confirm your valve body bolt pattern and case casting against the photos before ordering, or send your year and application so we can confirm fit. See the full TH350 parts collection for everything else we stock for this transmission, including the billet CNC full manual valve body with transbrake if your build calls for a trans-brake launch instead of a straight manual shift.
Because this valve body removes the vacuum modulator circuit, you no longer need a working modulator or vacuum line routed to the transmission - cap or remove that line as part of the install. Fill with Dexron ATF to the TH350's normal capacity, set the shifter detents to match the forward pattern before your first drive, and road test at low speed to confirm each gear engages cleanly before you take it to the strip. A worn stock valve body is usually paired with worn governor or boost valve bores elsewhere in the case; if you have not yet pulled the pan, inspect the planetary and bands for wear at the same time so you are not chasing a second problem after this install.
| Transmission | TH350 |
| Year Range | 1969-1986 |
| 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 remove automatic shifting so the driver selects every gear directly. Forward pattern keeps the shifter travel in the stock PRND2L order and typically retains 1st and 2nd gear engine braking, which is why it is the more common choice for street and street/strip builds. Reverse pattern reorders the shifter travel for bracket-racing shift speed and usually gives up engine braking to do it.
Forward pattern full manual valve bodies are commonly run on street and street/strip builds since the shift pattern and engine braking feel closer to stock. You are selecting every shift yourself with no automatic mode, so it takes more driver attention than a stock valve body in traffic.
No. A full manual valve body removes the vacuum-signal shift logic entirely, so the modulator circuit is no longer used - cap or remove the vacuum line as part of the install.
It is built for the TH350 across that range, but the transmission went through multiple case and valve body casting revisions, so confirm your bolt pattern and casting marks against the photos, or send your year and application to confirm fit before ordering.
A tired stock valve body is often paired with worn governor, boost valve or planetary wear elsewhere in the case. If you have not pulled the pan recently, inspect those components at the same time so this install is not undone by a second failure point.
This forward pattern unit is a manual-shift valve body without a trans-brake circuit. If your build calls for a trans-brake launch, the billet CNC full manual valve body with trans-brake is the version built for that.
