General Motors 8L90 torque converter theory and operation

This video is part five of a seven part series on the GM 8L90 transmission. In this video, I cover the operation of 8L90 torque converter. I describe the torque converter construction, electronic and hydraulic controls, and issues/concerns regarding this converter.
Here are the other videos in this series:
8L90 Overhaul - part one covers disassembly: • General Motors 8l90 Ov...
8L90 Overhaul - part two covers assembly, including clutch and gearset assembly and measurements: • General Motors 8l90 Ov...
8L90 Overhaul - part three covers valve body: • General Motors 8L90 me...
8L90 Mechanical and powerflow: • General Motors 8L90 me...
8L90 Hydraulics:
8L90 Electrical theory and operation: • General Motors 8L90 el...
8L90 Rebuilding Particulars:
8L90 Modifications and Tuning:
Special thanks to Precision International, TransGo, and Sonnax for providing me with product to use in these videos. Also thanks to KB Cores and AA Midwest for providing me with a few 8L90 cores at a good price!

[@jockosboy17]

Getting your fluid changed, using HPTuners turning off TCC lockup 1-4 and setting your slip rate table to 0 across the board you won't have any more issues with shutter and it being jerky when changing gears. Unless your TCC is already burnt. But making these changes may buy you time with a burn TCC before it has to be replaced assuming you can't get it replaced by GM. Also disabling DOD displacement on demand is a good idea while you are in there. After these changes the engine and trans will be vary reliable. Your local tuner shop can make all of these ECM/TCM changes for $300-$400. Well worth the money for the reliability and peace of mind it will give you. The 8L90 is a great transmission after these changes are made.

[@Dusty_Bottoms_]

Any other changes you may recommend for the 8L90?
I've read that some people adjust shift time and pressure.

[@jockosboy17]

@@Dusty_Bottoms_ These transmission are super sensitive to changes like shift times and pressures. I regularly tow with my changes listed above at max towing capacity and have yet to have an issue and it drives night and day better than stock. Also I no longer have to worry about the torque converter burning up.

[@satoshinakamoto8638]

I love all your little jokes and your fun demeanor. I wish I could take some of your classes, you're a great teacher. Thank you for these uploads

[@dreece2000]

Thanks

[@EteonEteon-fs1iz]

Do they make a billet high performance torque converter for a 2016-2017 Cadillac CTS 8L45 AWD 8 Speed transmission...🤔? Transmission

[@imanolmorales6955]

Is it true crocus cloth not recommended to clean valve bodies?

[@carldeuchert4528]

Where did you get your valve body organizing trays?

[@siuautomotive]

I made them with a router bit and some hdpe plastic from onlineplasticsupply.com

[@aquascapesirrigation6465]

What you need to do is to design a better transmission the 8l90 it’s a garbage having issues since I buy my gmc with only 3500 miles they never operate at it should

[@YAMCHAFAN]

These are horrible torque converters.
So many silverados just get shudder.