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Thread: New 6R80 transmission...

  1. #1
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    New 6R80 transmission...

    Anyone else think about the possibility of mating on of these to our engine? I love the thought of a 6-spd auto in an SC.

  2. #2
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    Does the aftermarket offer a stand-alone controller for it yet? That would probably be the biggest hurdle I think.


    cheers
    Ed N.

  3. #3
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    Looks like FAST makes something that might work, and I saw a couple others that may work as well. The gear ratios in the 6R80 are as follows:

    4.17, 2.34, 1.52, 1.14, 0.87, 0.69

    Biggest hurdle I see is figuring out what rear end ratio to run with the thing. A 2.73 would be equivalent to having a 4.10 out back of a 4R70W in gears 1-3. Not bad if you cross the traps under 115mph and can rev to at least 6250 rpm.

    Guys like David, Chris, or Kevin running 125mph+ trap speeds could get away with a 3.27 at the cost of shifting into 4th, but 1st-3rd gear would blow the tires off with a 13.63:1 final drive ratio. That's like a 4.80 rear gear!!

    Oh well... maybe it's not such a good idea after all.

  4. #4
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    Quote Originally Posted by Pablo94SC View Post
    Looks like FAST makes something that might work, and I saw a couple others that may work as well. The gear ratios in the 6R80 are as follows:

    4.17, 2.34, 1.52, 1.14, 0.87, 0.69

    Biggest hurdle I see is figuring out what rear end ratio to run with the thing. A 2.73 would be equivalent to having a 4.10 out back of a 4R70W in gears 1-3. Not bad if you cross the traps under 115mph and can rev to at least 6250 rpm.

    Guys like David, Chris, or Kevin running 125mph+ trap speeds could get away with a 3.27 at the cost of shifting into 4th, but 1st-3rd gear would blow the tires off with a 13.63:1 final drive ratio. That's like a 4.80 rear gear!!

    Oh well... maybe it's not such a good idea after all.
    Gear ratio's are the last worry. Bolting it up to your 3.8L would be by far the biggest challenge.
    Quote Originally Posted by Miller View Post
    Ya thats why i tape mine down. People think its bc i dont have a moonroof seal (which is true) but its really to keep my roof from ripping off .
    Email me here.

  5. #5
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    Quote Originally Posted by Pablo94SC View Post
    Guys like David, Chris, or Kevin running 125mph+ trap speeds could get away with a 3.27 at the cost of shifting into 4th, but 1st-3rd gear would blow the tires off with a 13.63:1 final drive ratio.
    as power levels go up you don't need as many gears. that is why i want/am going to a powerglide (just 2 forward gears)
    https://www.youtube.com/watch?v=7bNS...e_gdata_player 10.070 video
    Best ET to date 10.070
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    MPX blower/ NO NITROUS!

  6. #6
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    Quote Originally Posted by Kevin Leitem View Post
    as power levels go up you don't need as many gears. that is why i want/am going to a powerglide (just 2 forward gears)
    I have been thinking about going with a C4.............

  7. #7
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    Quote Originally Posted by XR7 Dave View Post
    Gear ratio's are the last worry. Bolting it up to your 3.8L would be by far the biggest challenge.

    What he said
    They don't call me "SLOWPOKE" for nothin!
    http://www.sccoa.com/forums/garage_v...vehicle&id=110
    Quote Originally Posted by ricardoa1 View Post
    I love the filter. Its pimp. paper element and 10Mircron filtration, 12" long cause size matters.

  8. #8
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    Quote Originally Posted by Roadhawg View Post
    I have been thinking about going with a C4.............
    With the advances they have with the AOD's and how tough those things are becoming (I've read easily over 800rwhp now) I'd get a built up one and at least have the OD when cruising along. Later vehicles with the 4r70w's are also up there when using a more modern one.

    I don't think there is anyone in the club running high enough power with the v6 that can out run a properly built up AOD/4r70w.

    Fraser

  9. #9
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    Quote Originally Posted by fturner View Post
    With the advances they have with the AOD's and how tough those things are becoming (I've read easily over 800rwhp now) I'd get a built up one and at least have the OD when cruising along. Later vehicles with the 4r70w's are also up there when using a more modern one.

    I don't think there is anyone in the club running high enough power with the v6 that can out run a properly built up AOD/4r70w.

    Fraser
    It's not about power handling. C4's have no advantage in that department. Where the C4 has an advantage is that it is lighter, cheaper to build, and has less internal frictional loss compared to an AOD type trans.
    Quote Originally Posted by Miller View Post
    Ya thats why i tape mine down. People think its bc i dont have a moonroof seal (which is true) but its really to keep my roof from ripping off .
    Email me here.

  10. #10
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    Good point Kevin. You wouldn't have use for this and I don't know if the rest of the high power guys do enough daily driving for this to be of any benefit.

  11. #11
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    Quote Originally Posted by fturner View Post
    With the advances they have with the AOD's and how tough those things are becoming (I've read easily over 800rwhp now) I'd get a built up one and at least have the OD when cruising along. Later vehicles with the 4r70w's are also up there when using a more modern one.

    I don't think there is anyone in the club running high enough power with the v6 that can out run a properly built up AOD/4r70w.

    Fraser
    I agree, but only if the car is mostly street driven and doesn't exceed a 1000 HP. For an SC of average weight that is mainly driven on the track or is making more than a 1000 HP (at the crank), I'd use a built TH400. From everything I've read, the C4 won't last very long in a high powered car that weighs more than 3000 lbs. Even the high powered mustang guys think their cars are too heavy for a C4, and the majority of guys with more than 650 rwhp use either a TH400 or a Glide.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

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  12. #12
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    Quote Originally Posted by David Neibert View Post
    I agree, but only if the car is mostly street driven and doesn't exceed a 1000 HP. For an SC of average weight that is mainly driven on the track or is making more than a 1000 HP (at the crank), I'd use a built TH400. From everything I've read, the C4 won't last very long in a high powered car that weighs more than 3000 lbs. Even the high powered mustang guys think their cars are too heavy for a C4, and the majority of guys with more than 650 rwhp use either a TH400 or a Glide.

    David
    C4 has the Advantages Dave mentioned. Mostly less power robbing. They do fail quite often though. Even the fully built ones...Usually input shaft failure....And they were replaced with Th400's and never touched again....One of my friends even put a bowtie with a Ford emblem in it, on the rear window of his SN-95. Under it said "Dazed and Confused". I didnt care as long as we didnt have to pull the Art Carr C4 out again...
    Last edited by frdlvr30; 01-04-2010 at 08:42 PM.

  13. #13
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    Quote Originally Posted by XR7 Dave View Post
    Gear ratio's are the last worry. Bolting it up to your 3.8L would be by far the biggest challenge.
    I thought that is what they made arc welders for .

    Fraser

  14. #14
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    Found the gear ratios for the 6r75. And some comparison numbers of other tran's

    6R75............................4.17 2.34 1.52 1.14 0.87 0.69 Thats one hellofa 1st gear.
    4R70W................................2.84 1.55 1.00 0.70
    AOD....................................2.40 1.47 1.00 0.67
    C4......................................2.46 1.46 1.00
    M5R2............................3.75 2.32 1.43 1.00 0.75
    M5R2-C.........................3.42 2.16 1.34 1.00 0.75

    And I see Ricardo is building tran's for ford. 6 Speed manual. Looks like a good one too.
    Ricardo 6...........2.611 1.708 1.233 0.943 0.767 0.625

    Pulled these numbers for this site Ford trans ratios
    Last edited by BLOWN38; 01-04-2010 at 11:38 PM.
    ~Chris
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    SCARlet on drag duty now

  15. #15
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    Quote Originally Posted by fturner View Post
    I thought that is what they made arc welders for .

    Fraser
    Sounds like a dare!
    God bless!!!

    1990 SC auto ... red outside, gray cloth inside ... ~205,000 miles (and climbing) ... driven daily!

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