Quote:
Originally Posted by 87Skier
The 6L90 is a revised version of the 6L80. It is said to have been designed to replace the 4L80 (in form and function), and uses clutch-to-clutch shifting and does away with bands completely. The 80 and 90 share about half their parts. They have the same gear ratios:
1st - 4.027
2nd - 2.364
3rd - 1.532
4th - 1.152
5th - 0.852
6th - 0.667
R - 3.064
Production started around 2005, and are being pretty much replaced by the 8L90. Evidently, you can only get a 6L90 in a 1500 series new truck. All the rest have 8L90's. You can find them in Camaro's, Corvette's, vans, and trucks in both 4wd and 2wd versions mostly between 2006-2016.
These are not Allison transmissions.
They require a CAN bus to operate, so they came behind gen IV ls engine.
The 6L80 uses a 32 spline output that is the same spline as a 4L80.
The 6L90 received a 29 spline for 4wd applications and a 36 spline for 2wd applications.
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Man, .66 OD? Thats pretty tall!
I did read your other thread with Clinebarger on it. Very impressive build. I wouldn't ever even think of doing more than removing the pan to change the fluid. Very cool upgrade!