6L80/6L90 General Specifications
What are the basic differences between GM's 6L80 and 6L90 transmissions?
| GENERAL SPECS | 6L80 TRANSMISSION | 6L90 TRANSMISSION |
|
RPO Code |
MYC | MYD |
| Transmission Drive | Rear Wheel | Rear Wheel |
| 1st Gear Ratio | 4.03 | 4.03 |
| 2nd Gear Ratio | 2.36 | 2.36 |
| 3rd Gear Ratio | 1.53 | 1.53 |
| 4th Gear Ratio | 1.15 | 1.15 |
| 5th Gear Ratio | .85 | .85 |
| 6th Gear Ratio | .67 | 67 |
| Reverse Gear Ratio | 3.06 | 3.06 |
| Torque Converter Size | 258mm or 300mm | 300mm |
| Pressure Taps | Line Pressure | Line Pressure |
| Fluid Type | Dextron VI | Dextron VI |
| Case Material | Aluminum | Aluminum |
| GVW | 8600 LBS | 15000 LBS |
| GCVW | 14000 LBS | 21000 LBS |
| Net Weight | 207-229 LBS | 240 LBS |