My truck is a 2008 Sierra Denali AWD. I thought that it came with the 6L90E, but I've now seen a thread on HP tuners site w/ a link to GM Truck Specs that says that all the '09 L9H (6.2VVT) trucks now comes w/ the 6L80E?? What gives? has GM changed this for 09, or do I have the -80? The specs on the -80 show that it has a lower max torque rating but a higher max RPM rating than the -90. Anyone know about these things??

 

You have the 6L80E, the 6L90E is only used in the HDs.

 

OK, that explains it then. Anybody break one of these yet? What's the max HP anyone has put through the 6L80E?

 

2008 Hydra-Matic 6L80 Transmission ( MYC ) 40808
Type: Six speed RWD / AWD, electronically controlled automatic overdrive transmission with torque converter clutch. Clutch-to-clutch architecture, with integral Electro / Hydraulic Controls Module
Maximum engine power: 469 bhp ( 349 kW )
Maximum engine torque: 439 lb-ft ( 595 Nm )
Maximum gearbox torque: 664 lb-ft ( 900 Nm )
Gear ratios: MYC
First: 4.03
Second: 2.36
Third: 1.53
Fourth: 1.15
Fifth: 0.85
Sixth: 0.67
Reverse: -3.06
Maximum shift speed 6500 rpm
Maximum Validated Weights: ( Target ) "GVW: 8600 lb (3901 kg)
GCVW: 14000 lb (6350 kg) with 3.42 axle
15000 lb (6804 kg) with 3.73 axle"
7-position quadrant: P, R, N, D, X, X, X ( X = available calibratable range position )
Case description: 3-piece ( Bell, main, extension )
Case material: die cast aluminum
Shift pattern: (2) Three-way on/off solenoids
Shift quality: Five variable bleed solenoid
Torque converter clutch: Variable Bleed Solenoid ECCC
Converter size: 300mm ( reference )
Fluid type: DEXRONŽ VI
Fluid capacity: w/ 258 & 300mm converter 258mm: 9.7L ( 8.22kg ), 300mm: 11.9L ( 10.1kg )
Transmission weight: w/ 258 & 300mm converter 258mm: Wet: 94-96kg ( 207-211lb )
300mm: Wet: 102-104kg ( 225-229lb )
Pressure taps available: line pressure
Assembly Site: GMPT Ypsilanti, MI
Applications: Chevrolet Corvette
Cadillac XLR
Cadillac XLRV
Cadillac STSV
Chevrolet Silverado
GMC Sierra Denali
GMC Yukon Denali
GMC Yukon Denali XL
Cadillac Escalade
Cadillac Escalade ESV
Cadillac Escalade EXT
H2
H2 SUT
H2 Alpha
Available Control Features: Multiple Shift Patterns ( Selectable or Adaptive )
Driver Shift Control ( Tap Up / Tap Down )
Enhanced Performance Algorithm Shifting ( PAS II )
Next Generation Tow / Haul Mode
Engine Torque Management On All Shifts
Altitude and Temperature Compensation
Adaptive Shift Time
Neutral Idle
Reverse Lockout
Automatic Grade Braking
Additional Features: Oil Life Monitor
OBDII / EOBD
Integral Electro/Hydraulic Controls Module ( Tehcm )
Control Interface Protocol - GMLAN



Ask and you shall receive!

 

I've personally seen two 6L90Es trashed within 10K miles of getting them. This was running 4.10s and 285 tires on 08/09 2500HDs. Seems the pickup on these new transmissions doesn't like steep grades like the 4L80 would take. They seem to hold up better on the flat but in off road/highway use i'm not sold yet.