The part codes that may be evident include the M33, M38 & M39 and these codes were for the conventional TH350. One more thing you can fall back on to identify the TH350 is the stampings placed on the transmission’s side. The cable is a kick-down cable and the TH350 has this cable whereas the TH400 does not have this feature. In this case, you are to ascertain if the cable is connected to the engine. There’s a cable that may be connected to the transmission’s side and next to the location of the shifter linkage. However, it is the TH400 if this fitting is at the transmission’s front-rear side. You’ll know it’s the TH350 if you have the fitting attached to the right frontal side of the transmission. This modulator has been stationed at the transmission’s side and there may be a rubber vacuum line connected to it. The next step is to find the vacuum modulator. It is worth noting that the length may range from 22 ¼ to 22 ¾ inches if it is the TH350 transmission. On the other hand, there’s no need to measure the tailshaft housing and this is an adapter with a cone-shape design.
This measurement should be taken from the front and from where it bolts to the back of the engine to the transmission’s end that links the tailshaft housing. It is also important to measure the length of the transmission. If the pan is square in shape and looks five-sided due to a cut in one corner, then you are dealing with the TH350. However, you can tell if it is a TH350 or TH400 depending on the transmission oil pan’s shape. On the other hand, the transmission oil pan is usually bolted to the transmission bottom. And if the number of bolts is around 13, then it means the unit is either a TH350 or TH400. Count the Number of BoltsĪscertain the number of bolts that are secured to the transmission oil pan. This transmission is mostly stationed at the rear-wheel of cars hence, its location may be the same in yours. Slide beneath the vehicle and find the transmission.
You can then lower the car onto the stands. Use your jack to lift the vehicle slightly while also ensuring that the jack sits securely beneath the frame rails. Set Up the Wheel ChocksĪdjust the wheel chocks at the back of the tires to ensure that the vehicle is firmly rooted to the ground. Here is a list of steps that will help you to identify the TH350 transmission: 1. The unit comes with a bell housing and weighs 120 lbs. The TH350 transmission is 21-3/4″ long and its body is made of aluminum alloy. That being said, chances that you’re using a GM vehicle with the TH350 transmission are high if the car is a model launched around these years. The transmission model was used in these cars until the early 1980s when the 700R4 transmission was launched. Cars that used the TH350 transmission include those from the late 1960s, as well as some GM all rear-wheel-drive vehicles launched in 1984. On the other hand, the TH350 was to serve as a replacement to the Powerglide transmission, which is a two-speed automatic transmission. It can also be said this model was created as a collaboration between Chevrolet and Buick, where the transmission was made to be compact, strong, and versatile.
The TH350 transmission is a three-speed automatic transmission launched by General Motors in vehicles from 1968. Therefore, work with us let’s show you all you need to know about this unit. Now this and many more are what we’ve outlined below. Its identification, for instance, helps you to differentiate this one-piece unit from other transmissions launched by General Motors.Īnd the super-tuning of this unit ensures that you can improve its performance to be a ride worth taking on fast and hard spins. The TH350 (Turbo-Hydramatic) transmission identification, decoding, and super-tuning are what sets it apart from other transmissions.
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