Hey Ray, thanks for posting this video. There's never any shame in trying something that doesn't work out. The man that has never failed is the man who has never tried. Remember, the best laid plans of mice and men often go awry! Have a great day and a great weekend my friend!
The GM 8L90 transmission runs too hot for starters. The transmission thermostat bypass opens up about 194F degrees if I’m not mistaken. The AFM System is what’s destroying these Torque Converters in my humble opinion respectfully. When the engine transitions back and forth from 8 to 4 & 4 to 8 cylinders, it significantly increases the TCC Desired Slip Rpm. I suspect GM engineers doing this to reduce vibration through the drivetrain for driver comfort at the expense of the Torque Converter itself. If the programming does not increase the TCC Desired Slip RPM during AFM, the customer would experience noticeable vibration every time the AFM engages. This act drastically wears out the Clutch lining inside the Torque Converter apply piston. The key to solving this issue if your transmission is not to far gone believe it or NOT is upgrading valve body, pump and turning off AFM. The transmission valve body and pump control the ENTIRE function of the transmission, to include the Torque Converter. There are 3 shift kits on the market that will absolutely eradicate this issue, if the transmission is still in good shape and not too far gone. These companies are SONNAX & TRANS GO I have personally myself installed and 😂combined 2 kits with a SONNAX TCC Kit and Shift Kit at 30,000 miles. I have 95,000 right now. Solved all my issues. Always remember that the Torque Converter Clutch Solenoid, TCC Pressure Regulator Valve and Pressure Regulator Spring are what controls the Torque Converter mechanically and electronically thru PCM to TCM commands thru CAN BUS…. communications network. It’s essentially a torque based model based upon engine torque. That determines shift strategy, shift pressures, shift timing and the transmission’s ability to request a torque reduction via reduced fueling, throttle control or ignition timing in order to make the shift.
Thanks for posting Ray. I'm having the same issue now with my 2019 GMC Sierra.
Hey Ray, thanks for posting this video. There's never any shame in trying something that doesn't work out. The man that has never failed is the man who has never tried. Remember, the best laid plans of mice and men often go awry! Have a great day and a great weekend my friend!
Thanks sir! Have a great weekend!!
lol, I have a squirrel finger puppet on my desk (daughter donation). He reminds me not to get distracted.
The GM 8L90 transmission runs too hot for starters. The transmission thermostat bypass opens up about 194F degrees if I’m not mistaken. The AFM System is what’s destroying these Torque Converters in my humble opinion respectfully. When the engine transitions back and forth from 8 to 4 & 4 to 8 cylinders, it significantly increases the TCC Desired Slip Rpm. I suspect GM engineers doing this to reduce vibration through the drivetrain for driver comfort at the expense of the Torque Converter itself. If the programming does not increase the TCC Desired Slip RPM during AFM, the customer would experience noticeable vibration every time the AFM engages. This act drastically wears out the Clutch lining inside the Torque Converter apply piston.
The key to solving this issue if your transmission is not to far gone believe it or NOT is upgrading valve body, pump and turning off AFM.
The transmission valve body and pump control the ENTIRE function of the transmission, to include the Torque Converter. There are 3 shift kits on the market that will absolutely eradicate this issue, if the transmission is still in good shape and not too far gone.
These companies are SONNAX & TRANS GO
I have personally myself installed and 😂combined 2 kits with a SONNAX TCC Kit and Shift Kit at 30,000 miles. I have 95,000 right now. Solved all my issues. Always remember that the Torque Converter Clutch Solenoid, TCC Pressure Regulator Valve and Pressure Regulator Spring are what controls the Torque Converter mechanically and electronically thru PCM to TCM commands thru CAN BUS…. communications network. It’s essentially a torque based model based upon engine torque. That determines shift strategy, shift pressures, shift timing and the transmission’s ability to request a torque reduction via reduced fueling, throttle control or ignition timing in order to make the shift.