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Thread: 6L85E Specs, Info, How it Works

  1. #1
    Join Date
    Jul 2007
    Posts
    237

    6L85E Specs, Info, How it Works

    Transmission General Description



    The Hydra-matic 6-Speed RWD is a fully automatic, 6-speed, rear-wheel drive, electronic-controlled transmission. It consists primarily of a 4-element torque converter, an integral fluid pump and converter housing, a single and double planetary gear set, friction and mechanical clutch assemblies, and a hydraulic pressurization and control system. There are four variants of the transmission, all based on torque capacity. Architecture is common between the variants, and component differences are primarily related to size.

    The 4-element torque converter contains a pump, a turbine, a pressure plate splined to the turbine, and a stator assembly. The torque converter acts as a fluid coupling to smoothly transmit power from the engine to the transmission. It also hydraulically provides additional torque multiplication when required. The pressure plate, when applied, provides a mechanical direct drive coupling of the engine to the transmission.

    The planetary gear sets provide the 6 forward gear ratios and reverse. Changing gear ratios is fully automatic and is accomplished through the use of a transmission control module (TCM) located inside the transmission. The TCM receives and monitors various electronic sensor inputs and uses this information to shift the transmission at the optimum time.

    The TCM commands shift solenoids and variable bleed pressure control solenoids to control shift timing and feel. The TCM also controls the apply and release of the torque converter clutch which allows the engine to deliver the maximum fuel efficiency without sacrificing vehicle performance. All the solenoids, including the TCM, are packaged into a self-contained control solenoid valve assembly.

    The hydraulic system primarily consists of a vane-type pump, 2 control valve body assemblies, converter housing and case. The pump maintains the working pressures needed to stroke the clutch pistons that apply or release the friction components. These friction components, when applied or released, support the automatic shifting qualities of the transmission.

    The friction components used in this transmission consist of 5 multiple disc clutches. The multiple disc clutches combine with one mechanical sprag clutch to deliver 7 different gear ratios, 6 forward and one reverse, through the gear sets. The gear sets then transfer torque through the output shaft.

    The transmission may be operated in any of the following gear ranges:

    PARK (P): This position locks the rear wheels and prevents the vehicle from rolling either forward or backward. PARK is the best position to use when starting the vehicle. Because the transmission utilizes a shift lock control system, it is necessary to fully depress the brake pedal before shifting out of PARK. For safety reasons, use the parking brake in addition to the PARK position.



    REVERSE (R): This position allows the vehicle to be operated in a rearward direction.



    NEUTRAL (N): This position allows the engine to be started and operated while driving the vehicle. If necessary, you may select this position in order to restart the engine with the vehicle moving. This position should also be used when towing the vehicle.



    DRIVE (D): Drive range should be used for all normal driving conditions for maximum efficiency and fuel economy. Drive range allows the transmission to operate in each of the 6 forward gear ratios. Downshifts to a lower gear, or higher gear ratio, are available for safe passing by depressing the accelerator or by manually selecting a lower gear in the manual mode range.



    MANUAL MODE (M): This position allows the driver to select a range of gears appropriate for current driving conditions. Refer to the vehicle owner's manual for specific manual mode information.



    Transmission General Specifications



    Name

    6L80

    RPO Codes

    MYC

    Production Location

    Ypsilanti, Michigan (USA)

    Transmission Drive

    Rear Wheel Drive

    1st Gear Ratio

    4.027

    2nd Gear Ratio

    2.364

    3rd Gear Ratio

    1.532

    4th Gear Ratio

    1.152

    5th Gear Ratio

    0.852

    6th Gear Ratio

    0.667

    Reverse

    3.064

    Torque Converter Size - Diameter of Torque Converter Turbine

    258/300 mm

    Pressure Taps

    Line Pressure

    Transmission Fluid Type

    DEXRON VI®

    Transmission Type: 6

    Six Forward Gears

    Transmission Type: L

    Longitude Mount

    Transmission Type: 80

    Product Series

    Position Quadrant

    P, R, N, D, M

    Case Material

    Die Cast Aluminum

    Transmission Net Weight (Approximate)

    100 kg (220 lb)

    Maximum Trailer Towing Capacity

    Refer to applicable owner's manual



    By HummerTech

  2. #2
    Join Date
    Nov 2006
    Location
    Cajun Country
    Posts
    440
    I want one
    DD: 2008 TB LS
    2005 Silverado VHO




  3. #3
    Join Date
    Mar 2003
    Location
    San Marcos Texas
    Posts
    4,393
    Nice low first gear and two overdrives. I wonder if the drag is less than the 4L80e? Weight is not too bad either. You won't need 4.11's with this tranny.
    2006 Superior Blue Trailblazer SS AWD, Stock as a rock

    Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).

    Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning

  4. #4
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Awesome information! Thanks HT!
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  5. #5
    Join Date
    Nov 2006
    Location
    Cajun Country
    Posts
    440
    I wonder if the drag is less than the 4L80e
    from what I read its alot
    DD: 2008 TB LS
    2005 Silverado VHO




  6. #6
    Join Date
    Apr 2003
    Location
    Mansfield, Texas, USA
    Posts
    2,462

    Thumbs up

    Yes, the only problem now is the integration. Hopefully it can be done.
    The superior man is modest in his speech, but exceeds in his actions. - Confucius

    "He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel

    '01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
    '80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL

    Let's face it, the red hair... makes 'em wet.


  7. #7
    HotRodV6 Guest
    Has anybody made any progress on the electronics of these new 6 speed trannys?

    Id love to put one of these in my 03 Silverado.

  8. #8
    Join Date
    Oct 2007
    Location
    connecticut
    Posts
    986
    would this bolt up to my truck? 99-02
    02' silverado ext. cb 2wd , 5.3 liter 325c.i. LM7, ported and polished throttlebody with bypass, Jannetty Racing 87 octane dyno tune, cold air intake with custom ram air, Heavy duty built 4l60e with vette servo, Z-pac clutches, "The Beast" Sunshell, transgo shift kit, yukon 4.10 gears with true trac, custom exhaust with Moroso Spiralflow, no cats, MSD 8.5 race wires, NGK TR55's
    Quote Originally Posted by farmtruc View Post
    Damn dude, take it easy on yourself during personal wacky time lol.
    Sometimes it can get out of hand
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  9. #9
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    yeah, it will bolt up. Don't know if you'll need the 80e or 60e flywheel. Gotta get a custom crossmember for it. Not sure how you'll control the shifts. Maybe a standalone transmission controller will be needed. I'm sure they'll be pricey at first. Surely Transgo is working on a full manual valve body for these conversions but then you'll have to find a shifter to handle six drive gears to mount on the floor if you go full manual.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  10. #10
    Join Date
    Jul 2007
    Location
    Stockton, Calif
    Posts
    88
    there is a company that is making a stand alone controller for the conversion, was suppose to be done last year, I did a quick search and couldn't find it. I will look some more tomorrow.
    Mark
    http://www.denalitrucks.com/sm-files/mark-sig.jpg
    But Officer, I swear its just a vacuum leak.

    Those red things? those are smog pumps!

    2004 Sierra Denali ----- 2/4 drop
    LSX 438 TWIN TURBO

    LSX Block Video
    Block number 00370. Build Date 04/17/2007

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