73 Cougar - 6R80 Swap
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Thread: 73 Cougar - 6R80 Swap

  1. #1
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    73 Cougar - 6R80 Swap

    It's been a while since I posted! My current transmission, a AOD/4R70W hybrid, has been bothering me in that I don't have good control over the shift points. I have decided to swap in a 6R80 transmission now that bell housing adapters are available. I haven't seen really any info on swapping these transmissions in to classic cars, so I will document the process here.

    I purchased the following:

    2014 F150 6R80 Transmission
    US Shift Quick 6 Transmission Controller
    Performance Automatic 68507 SBF to 6R80 Bellhousing Adapter
    Performance Automatic 68509 6R80 Torque Converter Adapter

    I'm still on the fence with the shifter. I will try to adapt the factory shifter to work. If it doesn't, I will use the Lokar Electronic Sport Shifter.

    The transmission mount will require fabrication. It's totally different from the C4/C6/AOD/4R70W mount - and several inches to the rear.

    Initial thoughts:

    - The 6R80 bellhousing is very similar to the SBF size - so there's no real concern here
    - The 6R80 body is significantly larger than a AOD/4R70W. I will need to relieve the tunnel near the old trans mount area. It does fit though!
    - The transmission mount differences don't appear to be major. I can definitely fab a mount.
    - The 6R80 does not have a slip yoke. I need a telescopic driveline. More on this later.
    - The 6R80 has no mechanical speedo hookup. Not a problem. Speedhut sells a mechanical driver that takes an electronic input.
    - The Performance Automatics 68509 kit lets you use the stock 6R80 torque converter.

    I will keep this updated with my progress...

    Pulling the AOD/4R70W out



    Old and new



    Bellhousing and adapter - the size is very similar





    Adapter installed



    Transmission test fit

    Last edited by gotgraham; 3 Weeks Ago at 09:21 PM.
    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

  2. #2
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    Re: 73 Cougar - 6R80 Swap

    I'm looking forward to the rest of the build. How many forward gears does this transmission have?
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  3. #3
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    Re: 73 Cougar - 6R80 Swap

    Quote Originally Posted by badcatt View Post
    I'm looking forward to the rest of the build. How many forward gears does this transmission have?

    Thanks! It has 6 forward gears - 2 overdrives.
    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

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  5. #4
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    Re: 73 Cougar - 6R80 Swap

    It fits! I have a minimum of 1/2" clearance after removing a portion of the factory trans mount reinforcement. I'm designing a rear trans mount to bolt to the subframe. It also appears I can use the factory shifter.







    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

  6. #5
    Join Date
    Feb 2010
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    Ft Laud Fl
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    Re: 73 Cougar - 6R80 Swap

    As we always say, your never really done tinkering with these old cars glad your posting your project I gave up on you since you quit the blog updates Some really good info on your trials and tribulations working on your phatcat
    2008 Suburban Daily Driver
    1973 XR7 Vert 351Q
    Ex 1967 Coupe
    Ex 1972 XR7 Vert
    Ex 1975 XR7

    I know I have the right to remain silent, sometimes I just don't have the ability

  7. #6
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    Re: 73 Cougar - 6R80 Swap

    Quote Originally Posted by CatsRock View Post
    As we always say, your never really done tinkering with these old cars glad your posting your project I gave up on you since you quit the blog updates Some really good info on your trials and tribulations working on your phatcat
    Haha I really should update that. It got to be a chore so I gave up. Then I got too far behind. I'm trying to be better about documenting my projects now

    I think the main things I added to the car were Traction Control, Launch Control, and this 6R80 (now). I did make a cool little dashboard display to show me all my stats - installed where the factory clock is. I sort of checked out for a bit and build some other projects. I made a reverse trike and for the past 18 months have been building an electric DeLorean.






    Last edited by gotgraham; 3 Weeks Ago at 06:08 PM.
    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

  8. #7
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    Re: 73 Cougar - 6R80 Swap

    [QUOTE=gotgraham;995313]Haha I really should update that. It got to be a chore so I gave up. Then I got too far behind. I'm trying to be better about documenting my projects now

    No worries Jacob, I was just busting your chops a little I know its a pita taking pictures and documenting steps while trying to get stuff done. Glad your still sharing your phat cats with us.
    2008 Suburban Daily Driver
    1973 XR7 Vert 351Q
    Ex 1967 Coupe
    Ex 1972 XR7 Vert
    Ex 1975 XR7

    I know I have the right to remain silent, sometimes I just don't have the ability

  9. #8
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    Re: 73 Cougar - 6R80 Swap

    wow - do you have a write up on the delorean conversion?
    Leon
    Brisbane, Australia

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  10. #9

    Re: 73 Cougar - 6R80 Swap

    I like this. These newer transmissions are so much better then the old stuff, Glad to see someone making the available controls and adapters to makes these work on older stuff

  11. #10
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    Re: 73 Cougar - 6R80 Swap

    Quote Originally Posted by leonbray View Post
    wow - do you have a write up on the delorean conversion?
    Sort of. You can follow my instagram @gotgraham - I've been posting the updates there. I did start posting some on DMCTalk - http://dmctalk.org/showthread.php?17...wered-DeLorean
    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

  12. #11
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    Re: 73 Cougar - 6R80 Swap

    Updates -

    I designed a new shift lever (for the transmission) and a cross member. The cross member is made of 3/16" 304 stainless. It seems to all fit well. I designed it to interface to the Stifflers Suspension insulator - https://www.summitracing.com/nv/parts/ivp-tm-m06 I also had the new driveline made (not pictured). I'll get some better pics up in the next couple days.








    Last edited by gotgraham; 2 Weeks Ago at 11:00 AM.
    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

  13. #12
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    Re: 73 Cougar - 6R80 Swap

    More updates. The transmission and driveline are all bolted in. I had some issues with the torque converter snub to crank pilot distance. Ford made some inter-year change to the 6R80 TC design, so the depth changes a little. I modified the pilot adapter on the lathe and shortened the TC snub. All fit fine after that.









    You can see the TC stud spacers here. These account for the adapter plate.

    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

  14. #13
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    Re: 73 Cougar - 6R80 Swap

    Update!

    I finished the transmission cooling system and shifter linkage. I'm running a B&M SuperCooler (70274), -8AN lines, and Performance Automatic cooler line adapters. For the shifter, I'm using a Performance Automatic AOD shift linkage (from my previous install) and a custom shift lever that I designed. It works great. The shift indicator lines up perfectly on the factory Cougar shifter. I should have the US Shift Quick 6 controller tomorrow and plan to be back on the road on Friday.





    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

  15. #14
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    Re: 73 Cougar - 6R80 Swap

    * leans back in my chair watching and reading in awe*

  16. #15
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    Re: 73 Cougar - 6R80 Swap

    Quote Originally Posted by ndtorque View Post
    * leans back in my chair watching and reading in awe*
    Ha thank you!
    1973 Mercury Cougar XR7 Hard Top - Ford Bright Red w/ 1/2 vinyl top. 552hp/566tq 427W. 6R80 Transmission.
    1981 DeLorean DMC-12 - 300kW electric conversion

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