TH350 Master Rebuild Kit 1968-1979, new and ready to install. Fits the TH350. Ships fast from the USA.
If the Turbo 350 behind your small block slips on the 1-2 shift, flares into third, leaks from every seal it has, or dumps black fluid and friction material into the pan, the honest fix on a high-mileage unit is a full overhaul, not a reseal. This master overhaul kit is cataloged for 1968-1979 TH350 transmissions, the early non-lockup units found in Chevrolet, GMC, Pontiac, Oldsmobile and Buick cars and trucks. It carries the seals, gaskets, bushings, filter, friction clutches and steel plates. It does not include valve body modifications, so the shift calibration stays stock unless you add a shift kit.
The TH350 is a three-speed with a forward clutch, a direct clutch, an intermediate clutch, an intermediate overrun band, a low and reverse clutch, and a roller clutch, all fed by a gear pump and steered by vacuum modulator and governor pressure. There is no computer to compensate for a loose clutch pack or a leaking seal, so what you assemble on the bench is exactly what you drive. Because this kit includes steels as well as frictions, you can replace both halves of every pack at once instead of reusing plates that have been heat-cycled for decades. New bushings matter just as much: they keep the drums and shafts centered and meter lube oil, and on a TH350 several of them help hold pressure.
Rule out the cheap items first: check the fluid level hot, pull the modulator vacuum line and look for fluid in it, and make sure the kickdown and shift linkage are adjusted. If the pan is full of lining and the unit still slips with good fluid and vacuum, it is time to tear down. Our TH350 common problems and fixes guide walks through the modulator, no-2nd and no-reverse checks. Before you order anything, read the model code on the case, because forward, direct and intermediate plate counts and steel thicknesses change from code to code.
This kit is listed for 1968-1979 TH350 units. GM introduced the TH350 for the 1969 model year, so in practice it covers the early conventional (non-lockup) transmissions built before the TH350C arrived late in the 1979 model year. If your case has an electrical connector on the left side, it is a lockup TH350C and needs different pump and sealing parts. When in doubt, send us your year, the model code and your VIN, and browse every matching part on our TH350 parts page.
For the wear points and upgrades worth doing during the job, see our TH350 rebuild wear points guide, and for budgeting the hard parts a teardown can turn up, read what drives TH350 rebuild cost.
| Fits | TH350 1968-1979 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. It includes clutches and steels along with seals, gaskets, bushings and a filter, so you can replace every clutch pack completely.
No. Valve body modifications are excluded, so the transmission shifts like stock. Add a separate TH350 shift kit if you want firmer, quicker shifts.
It is cataloged for 1968-1979. Lockup TH350C units, introduced late in the 1979 model year and identified by an electrical connector on the left side of the case, use different pump and sealing parts. Send us your model code and VIN if you are unsure.
The TH350 uses Dexron ATF. Soak the new frictions in it before assembly and fill to the correct level with the engine running and the fluid hot.
Inspect the intermediate overrun outer race, the 1-2 accumulator and intermediate servo bores, the pump and the drums. Flush or replace the cooler so old debris does not reach the new clutches.
The kit contents list clutches, steels, seals, gaskets, bushings and a filter and do not call out a band. Inspect the intermediate band at teardown and replace it if it is glazed, cracked or worn thin.
