Points of Interest
The TH350 is an automatic shift, three speed transmission. The TH350 transmission was introduced in the 1969 model year as the successor to the GM Power glide automatic transmission. The TH350 transmission was developed in a joint effort by the Chevrolet and Buick Automotive Corporations. The TH350 transmission it is also referred to as the CBC (Chevrolet-Buick Combined) 350. Soon after production the Turbo 350 quickly became known for its strength, versatility and compactness.
The Hydra-Matic 350 transmission was prevalent in nearly all General Motors rear-wheel-drive cars and trucks through 1984. To name a few, this transmission was used in the Caprice, Chevelle, Corvette, Blazer, and Nova.It was typically paired …show more content…
This includes the V6, V8, I6 & Iron Duke I4. Another version of the transmission, the Buick / Oldsmobile / Pontiac (BOP) TH350, will be compatible with the Buick 90 degree V6 & V8 engines, as well as the Oldsmobile and Pontiac 90 degree V8. This “BOP” version features a “valley” at the twelve o’clock position of the block flange where the peak would be on the Chevy version. Differences such as this will only affect the front bell of the case, and all TH350 cases are similar from that point back. Note that there are dual-pattern “uni-cases” that are compatible with both the Chevy and BOP style engine …show more content…
The gear ratios used for this transmission were 2.52 for 1st gear, 1.52 for 2nd gear, and 1.0 for 3rd gear. known as a “delayed engagement.” This issue is simply the result of a low fluid level or a clogged filter/screen. He went on to say that if a TH350 suffers from this “aging complaint” only when cold, it’s most likely that the lip seals have become too brittle. If this is the case, then they are not properly sealing until after a 10-15 minute idle warmup.
On the other hand, it is possible that a TH350 can suffer from an early shift. The culprit is usually because the original vacuum line running from the intake manifold to the vacuum modulator may have either rusted apart or corroded, and someone replaced it with a generic rubber piece.
Doing this will also cause the clutches to burn out due to a lack of line pressure rise. Obviously, the best thing to do when the metal line needs replacing is to use the correct
The TH350 is an automatic shift, three speed transmission. The TH350 transmission was introduced in the 1969 model year as the successor to the GM Power glide automatic transmission. The TH350 transmission was developed in a joint effort by the Chevrolet and Buick Automotive Corporations. The TH350 transmission it is also referred to as the CBC (Chevrolet-Buick Combined) 350. Soon after production the Turbo 350 quickly became known for its strength, versatility and compactness.
The Hydra-Matic 350 transmission was prevalent in nearly all General Motors rear-wheel-drive cars and trucks through 1984. To name a few, this transmission was used in the Caprice, Chevelle, Corvette, Blazer, and Nova.It was typically paired …show more content…
This includes the V6, V8, I6 & Iron Duke I4. Another version of the transmission, the Buick / Oldsmobile / Pontiac (BOP) TH350, will be compatible with the Buick 90 degree V6 & V8 engines, as well as the Oldsmobile and Pontiac 90 degree V8. This “BOP” version features a “valley” at the twelve o’clock position of the block flange where the peak would be on the Chevy version. Differences such as this will only affect the front bell of the case, and all TH350 cases are similar from that point back. Note that there are dual-pattern “uni-cases” that are compatible with both the Chevy and BOP style engine …show more content…
The gear ratios used for this transmission were 2.52 for 1st gear, 1.52 for 2nd gear, and 1.0 for 3rd gear. known as a “delayed engagement.” This issue is simply the result of a low fluid level or a clogged filter/screen. He went on to say that if a TH350 suffers from this “aging complaint” only when cold, it’s most likely that the lip seals have become too brittle. If this is the case, then they are not properly sealing until after a 10-15 minute idle warmup.
On the other hand, it is possible that a TH350 can suffer from an early shift. The culprit is usually because the original vacuum line running from the intake manifold to the vacuum modulator may have either rusted apart or corroded, and someone replaced it with a generic rubber piece.
Doing this will also cause the clutches to burn out due to a lack of line pressure rise. Obviously, the best thing to do when the metal line needs replacing is to use the correct