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Old 04-17-2017, 11:08 PM   #11
'63GENIII
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Join Date: Sep 2008
Location: San Carlos, Ca.
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Re: How much spline engagement do I need?

Quote:
Originally Posted by 87Skier View Post
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.
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!
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'63 k15 long step
Vortec 7.4 - L29 Blackbear tune, Five 0 Motorsports injectors, Chris Straub Cam, NV4500, divorced 205
52" front and 63" rear spring swap
D44 / 14bff - disc axles
Milemarker 9K and 10.5K hydraulic winches

63" & B52 Spring Install http://67-72chevytrucks.com/vboard/s...ng+swap+thread


NV4500 Reverse Build Thread http://67-72chevytrucks.com/vboard/s...=reverse+build

L29 - 7.4 Vortec Build http://67-72chevytrucks.com/vboard/s...&highlight=L29
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