TH350 Master Rebuild Kit 1969-1979, new and ready to install. Fits the TH350. Ships fast from the USA.
A 1969-1979 Turbo 350 that has started slipping, shifting late, or engaging Drive with a long pause is usually telling you the clutch packs and seals are done. This master kit is built for those early, non-lockup units in Chevrolet, GMC, Pontiac, Oldsmobile and Buick cars and trucks, and it is one of the more complete boxes you can buy: Borg-Warner friction clutches with steel plates, a soft parts kit with every rubber seal and gasket, a full bushing kit, the band, a new filter and an adjustable vacuum modulator.
The early TH350 relies on hydraulics alone. Line pressure comes from the pump and is raised or lowered by the vacuum modulator, while the governor and throttle linkage decide when it shifts. The frictions and steels in this kit rebuild the forward, direct, intermediate and low/reverse packs. The band holds the sun gear for manual second, and a glazed one is a classic reason for no engine braking in 2. The full bushing set goes beyond the few popular bushings, which matters because worn bushings let drums wobble and bleed off the lube and pressure oil they are supposed to contain. Including a modulator means the part that sets your shift firmness starts fresh with the rest of the unit.
Pull the vacuum hose off the modulator; if ATF drips out, the diaphragm has failed and that alone can cause harsh shifts and fluid loss. Check the fluid hot and look at what is in the pan. A unit that still slips with a good modulator and correct fluid level has worn clutches or a leaking circuit inside. Our TH350 problems and fixes guide covers the modulator test and the no-2nd and no-reverse checks step by step.
The kit is listed for 1969-1979 TH350 transmissions. That covers the conventional TH350 from its 1969 introduction up to the lockup TH350C, which appeared late in the 1979 model year and can be identified by an electrical connector on the left side of the case. A late-1979 vehicle could have either, so look for that connector. Plate counts also vary by model code; match the new packs to the ones you remove, or send us your year, model code and VIN to confirm. See all early TH350 parts on our TH350 parts page.
Plan the full job with our TH350 wear points and upgrades guide and our filter and pan service guide for the refill and first service.
| Fits | TH350 1969-1979 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Reference | THM350 |
| 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 Borg-Warner clutches with steel plates and the band, plus a soft parts kit, full bushing kit, filter and adjustable modulator.
It is listed for 1969-1979 units. Later TH350 and lockup TH350C transmissions can differ in pump and sealing parts, so confirm with your model code and VIN before ordering for a later unit.
Soak every friction in fresh Dexron ATF before assembly. Transmission Digest recommends at least 15 minutes; longer does no harm.
Start at the factory-style setting, road test, and change it in small steps. Turning it to raise pressure gives firmer shifts, and lowering it softens them. Never adjust it to cover a slipping clutch.
Dexron ATF. Check and set the level with the fluid hot and the engine running after the rebuild.
The intermediate overrun outer race, the 1-2 accumulator and servo bores, the drums, planetaries, sun shell and pump. These hard parts decide whether a rebuild lasts.
