The flex plate is designed to 'flex' in order to allow the torque converter to spin at such a high speed and not cause heavy vibrations. 4L60E Design Changes and Tags - Duration: 20:11. .If you plan to use this flex plate on an LS motor, you must remove the balance weight!!!!. Ended up ordering from Jegs, part #555-601062 A side note to my swap S10 V8 swap in regards to.
4.8/5.3 4L80E Swap & General Information
4L80E Differences:
'91 -'96: They are all pretty much the same. They were also known to have a crappy connector that passes through the case. Most have had them updated by now, but there are still some that haven't and might need replacing. They have the ‘older’ style lubrication, where both cooling lines are behind the bellhousing. They also have larger overdrive roller clutch, usually came with a 16 element sprag instead of the 36 element. The bellhouse bolt pattern is the traditional SBC/BBC pattern. These early transmission also did not have mounting holes for the manual lever position switch (MLPS) ie. neutral safety switch.
'94 -'96: These are the same as the earlier ones but with a few differences. It has an updated EPC (electronic pressure control) solenoid. Some also had a longer shift shaft for the MLPS.
'97 - '99: These years have the ‘new’ style lubrication, where there is one oil cooler line behind the bellhousing and the other being farther towards the back of the transmission. Also uses the bellhousing bolt pattern of previous years.
‘00 - ’03: Same as previous years but bellhousing bolt pattern was changed to the LS style.
![Plate Plate](https://www.performancetrucks.net/forums/attachments/gm-drivetrain-suspension-22/71105d1410309641-4l60e-4l80e-flex-plate-problem-image.jpg)
‘04 - up: Same as previous year with some minor valve body changes.
Gear Ratio: