Automatic Transmission
8L90 Vacuum Testing
Below are the diagrams for vacuum testing GM 8L90 transmissions. Note: OE valves are shown in rest position and should...
Below are the diagrams for vacuum testing GM 8L90 transmissions. Note: OE valves are shown in rest position and should...
This is certainly an issue that you should look into to ensure that your transmission has adequate fluid capacity to...
Note: OE valves are shown in rest position and should be tested in rest position unless otherwise indicated. Test locations...
Shift valves and relay valves share a lot of the same duties. This article is one of a series by...
Knowing how these circuits work and the slightly different variations that the manufacturers utilize should pinpoint any valve body-related issues
How Changing Gear Ratios Helps Prevent Drivetrain Damage
What to Check First When Troubleshooting OD Issues
When disassembling a Toyota/Lexus U660E valve body, pay close attention while removing the pressure switch from the valve body.
Knowing your transmission’s hydraulic circuit — and solenoid circuits in particular — can be very helpful when identifying the underlying...
This article is one of a series by Sonnax exploring how valves and hydraulic circuits work and what results when...