302/C6 Transmission Adapter Plate

Discussion in 'Technical' started by danzig, Apr 27, 2002.

  1. danzig

    danzig New Member

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    I am installing a C-6 transmission on my 302. Do I need an adapter plate for my flex plate? Because my torque converter keeps getting pulled out by flex plate and eating the hell out of my front seal.

    Thanks

    -74 Maverick
    302 w/ 289 heads
  2. Old Guy

    Old Guy Member

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    Just so we all get the info right, would you please tell us what the converter size and bolt pattern is. Also the number of teeth on the flex plate and any other details on what you had in there and what you have chgd. for the C6. This will help in determining your problem. Thanks
  3. K. Merring

    K. Merring Regular

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    danzig, if your wanting to put a C6 into a Mav., it will be a hassle. Thet don't fit the transmission tunnel and firewall.
  4. littleredtoy

    littleredtoy Seth

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    Why a c-6

    There is such a thing as a 'small block' C-6. I have seen them. I even owned one, didn't install it. From what I understand they were installed in some trucks, station wagons and Rancheros etc. behind 302's and maybe something else, I am not sure.

    Most of the C-6's were mated to the larger FE and 385 series engines. FE's were the 332,352,360,361,390,391,406,410,427 and 428 engines. The 385 family was the 429, 429 Boss (no A/T according to my manuals) and 460 big blocks.

    According to 'Mustang Monthly', (July 2000-page 22), the C-6 eats over 30 hp before sending the motion to the rear wheels.
    Another transmission you may consider, I would recomend a well built C-4 or an AOD swap, is the FMX. Most mechanics hate it. It is said to be quirky, heavy (cast iron case vs. aluminum in C-4/C-6) and expensive to work on. I have however seen them behind several 351W's and some Clevelands I believe. They seemded to take some abuse.

    By the way, the C-6 debuted in the 1967 Mustang. The C-4 name stands for the year it was designed. (c=1960's, 6=last number in the decade code).:D
  5. littleredtoy

    littleredtoy Seth

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    Correction: ...the name C-6...

    N/M
  6. mark_b

    mark_b Member

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    C-6 transmissions can be found in 1970's ford vans with 351w in them.

    I converted from the stock AOD in my 85 E-150 van to a c-6 for durability and towing purposes.

    Just a little info for the data base :)

    Mark
  7. igo1090

    igo1090 Member

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    sounds like you have the wrong flexplate. converter should only pull forward a min of .100 inch and a maximum of .185 ( 3/16ths) inch. snout of converter must go into crank at least 1/8 inch if you decide to use washers to shim your setup (this can be a bitch to check on a ford trans unless you cut the bottom of the bellhousing away). best option is get the correct flexplate in it.

    why use a c-6? they eat horsepower and weigh a lot more than a c-4. there should be no durability problems with a c-4. a friend of mine has a well-built one behind a 460 9 second car with no problems. a mildly prepped c-4 will hold up well behind most 302s.
    Last edited: Apr 8, 2004
  8. mark_b

    mark_b Member

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    What is the horse power loss comparision from the C-4 to the
    C-6?

    Mark
  9. igo1090

    igo1090 Member

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    an old article i have says c6 eats 50 hp and c4 25hp. there is also a weight penalty for using the c6. the bottom line is that a car will be quicker with a c4 than a c6. if doing a lot of towing or running a heavy car/truck, then c6 is worth it for the durability. i know guys running 9 second big block cars having no problem with c4s as far as durability and performance.
  10. mavman

    mavman Member

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    There is another website that I have frequented that has a member that runs a 4000+ lb Galaxie with a 557 stroker deep in the 9's with a C4. They're plenty strong, no need for a C6 in a relatively light maverick. Not to say a C6 is a crappy trans...they're darned near bulletproof (unless you're my brother), just heavy and they eat up a LOT of HP. Expect .3-.4 sec. ET improvement switching to a C4.
  11. mark_b

    mark_b Member

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    better gas milage?

    I use the c-6 in my 1985 302 2v E150 ford van.

    I'm on a gas mileage kick right now. I wonder how much better gas mileage I would get with a c-4.
    I ripped out the...
    Air pump
    A/C and all the brackets
    converted to manual steering
    converted to electric fan
    Converted fron TFI ignition to duraspark 2
    changed to conventional 2bbl carb.
    Manual choke
    3" exhaust
    3:100 rearend gears
    Stock cam
    8.5:1 compression

    I went from 13.5 miles to the gallon to 17!!!:D

    All the traveling I do makes it worth it!

    I still want to get headers and 275:1 gears

    I'm just so happy! Wanted to share the joy!


    Mark
    Last edited: Apr 9, 2004
  12. mavman

    mavman Member

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    Re: better gas milage?

    I'm on a gas mileage kick right now.




    Yeah, me too. Bad part is, the darn Mustang is getting crappy mileage lately for some reason. It's been down as low as 22-24 lately, even grandma-driving (no offense to anyone). It's got about 30,000 since I put a new cap/rotor/wires/plugs on it and I figure that ain't helping since when I put 'em on, they were used to begin with. Still, though...It was getting 30+mpg all winter.

    17 MPG in a Van? That's respectable! Some headers will help for sure, as well as leaning that baby out and retarding the initial timing to aid the "lean miss" at low speed. In my '95 F150, I'm lucky to get 12-14, even on the best days (5.0L-5 speed)
  13. courier11sec

    courier11sec Member

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    In most areas the formulation of gasoline is different between summer and winter I believe.
    Anyone have knowledge to the contrary?
  14. auburn

    auburn Member

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    :cry: OH, Don't Tell Me That!!

    The c-6 actually won't fit under the tranny tunnel? I have a brand new TCI Street Fighter c-6... i picked it up from a buddy who was going to use it in his project toy but never was able to find enough $ to finish it. So, I bought it off of him before he sold everything out.

    So, fill me in guys... how much work is it going to take to make this fit? I understand the power that's being robbed out with the c-6 but, am I up for more than I planned on?

    Am I better off throwing the tranny on eBay and buying the c-4?
  15. Craig Selvey

    Craig Selvey Indiana State Rep - MCCI Supporting Member

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    Sell the c-6....get a c-4.
  16. 71gold

    71gold Frank Cooper Supporting Member

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    hey 11sec. i understand they change it 4 times a year and diff. elevations have their mix. when i went out west to visit my sister, sometimes i thought i got bad gas. i went northwest and came back southeast. i guess i got the whole range of mix. outside temp. i think has a lot to do with gas mpg.
    anyone know where we can get this info.?
    i went to the oil site and learned more than i wanted to know about that stuff. ( i now buy the cheapest oil and change it every 50 miles):D :D ...frank...:bananaman :bananaman
  17. Camtemple

    Camtemple Member

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    Just the other day I broke my C4, stomped on it in first, shifted into 2nd kinda hard, and into 3rd it completely slipped for a good half secound, I backed off, and that was the end of that Tranny. Guess i'll need to get that rebuilt, kinda pisses me off though. But the tranny was real weak to begin with.
  18. Max Power

    Max Power Vintage Ford Mafia

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    LittleRedtoy

    Dude, if you want to edit your posts, just click on the little button on the lower right.:D

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