What was the first GM transmission with a torque converter?
The first torque converter used by GM was installed in a 1949 Buick Dynaflow automatic transmission, and the first Pontiac transmission to be so equipped was the 1961 3-speed Roto Hydra-Matic. The earlier 4-speed Hydra-Matic utilized a fluid coupling, which is similar to a converter but does not utilize the third element to multiply torque.
Why is my transmission not shifting out of first gear?
Transmission wont shift out of first gear Stays in limp-in mode, Chrysler vehicles If you own a Chrysler vehicle and the transmission stays in 1 gear and will not shift, chances are the computer has put it into “limp in” mode. The underlying condition can be an internal fault, a defective solenoid pack,
What is the usable RPM of a Pontiac?
The typical street Pontiac has a usable power range from idle to 5500 rpm. As a stock converter will begin to transfer enough power to move the car at very low rpm, the usable rpm range is approximately 5000.
What do you need to know about transmission torque?
‘Know about gear transmission torque’ is the page explaining some factors such as load, efficiency and number of teeth of gears to calculate transmitted torque. TEL : +81 48 254 1744 HOME Selecting gears Stock gears Gear Catalog Gear Drawing Gear Knowledge How to Buy “Easy” Gear Selection Screen – Choose a gear by pitch, # of teeth, or bore size.
The first torque converter used by GM was installed in a 1949 Buick Dynaflow automatic transmission, and the first Pontiac transmission to be so equipped was the 1961 3-speed Roto Hydra-Matic. The earlier 4-speed Hydra-Matic utilized a fluid coupling, which is similar to a converter but does not utilize the third element to multiply torque.
The typical street Pontiac has a usable power range from idle to 5500 rpm. As a stock converter will begin to transfer enough power to move the car at very low rpm, the usable rpm range is approximately 5000.
What causes a GM torque converter to lock up?
Most of the time it is a stuck Torque Converter Clutch (TCC) solenoid, but this is not the only cause of this problem. General Motors has issued a few Technical Service Bulletins (TSBs) relating to this problem. There is also a specific diagnostic procedure to determine the exact cause of the TCC problem.
How does the oil pump pressurize a torque converter?
Upon engine startup, the transmission oil pump pressurizes the converter with ATF. The impeller “throws” the ATF into bucket-like receptacles of the turbine and generates some pressure on the turbine in the same direction as the impeller is turning.
What kind of torque converter does a Oldsmobile use?
The GM 4-speed Hydra-Matic solved this problem by incorporating a very low first gear (3.81-3.97, depending on the model) in conjunction with the fluid coupling to improve acceleration, and this combination was used from 1940 to 1964 in Oldsmobiles, Cadillacs and Pontiacs.
What is the purpose of the torque converter clutch?
The purpose of the Transmission Converter Clutch (TCC) feature is to eliminate the power loss of the torque converter stage when the vehicle is in a cruise mode. The TCC System uses a solenoid-operated valve to couple the engine flywheel to the output shaft of the transmission through the torque converter.
Why do I need to lock up the torque converter?
The TCC System uses a solenoid-operated valve to couple the engine flywheel to the output shaft of the transmission through the torque converter. Lockup reduces slippage in the converter increasing fuel economy. For the converter clutch to apply, two conditions must be met: Internal transmission fluid pressure must be correct.
What are the conditions for the converter clutch to apply?
For the converter clutch to apply, two conditions must be met: Internal transmission fluid pressure must be correct. The ECM must complete a ground circuit to energize the TCC solenoid that moves a check ball in the fluid line. This allows the converter clutch to apply when hydraulic pressure is correct.
Can a 350 inch engine stall a torque converter?
If a 350-inch engine can stall a given converter to 1800 rpm, a 455 engine would stall the same converter several hundred rpm higher due to the increase torque of the 455 at 1800. What about the load the converter sees?
What does Flash mean on a torque converter?
Converter Flash RPM: The engine rpm that a given engine will reach at full throttle at the point the vehicle begins to move with no brake application. both stall and flash must be checked from idle speed. Converter Coupling Efficiency: The relative amount of slippage after the converter is “coupled.”
What was the first car with a torque converter?
Later, a truck was produced in Sweden in the ’30s with a torque converter. The first torque converter used by GM was installed in a 1949 Buick Dynaflow automatic transmission, and the first Pontiac transmission to be so equipped was the 1961 3-speed Roto Hydra-Matic.
If a 350-inch engine can stall a given converter to 1800 rpm, a 455 engine would stall the same converter several hundred rpm higher due to the increase torque of the 455 at 1800. What about the load the converter sees?
Converter Flash RPM: The engine rpm that a given engine will reach at full throttle at the point the vehicle begins to move with no brake application. both stall and flash must be checked from idle speed. Converter Coupling Efficiency: The relative amount of slippage after the converter is “coupled.”
What is the stall ratio of a torque converter?
The torque converter multiplication and the 2.5 gear give a 5:1 stall ratio, and this combination provides excellent acceleration from a stop. Second gear is 1:5 ratio and Third is 1:1 (direct drive), so the steps between each gear are relatively small, which provides efficient and smooth shifts.