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  •  » C4 question

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    9/22/2023 6:31 AM  #1

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,156

    C4 question

    Can the valve body from a 1974 C4 transmission be swapped into a 65-66 C4 to change it to a 1-2-3 shift or is there more to it than that?

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    9/22/2023 11:14 AM  #2

    Glens 1965 50
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    From: Tomball,Tx
    Registered: 4/01/2013
    Posts: 278

    Re: C4 question

    Steve  according to my tranny buddy it will not.  Too many bolts.  Only a 67-70 will work. FWIW.

     

    9/22/2023 1:12 PM  #3

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
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    Re: C4 question

    Thanks, Glen.  I found a 74 C-4 in Austin for $150, but have not agreed to buy it yet.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    9/22/2023 2:12 PM  #4

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: C4 question

    I have a friend that has a transmission shop an he said go with a 1970 and up C4 if you gonna be putting a 331 stroker.

    Last edited by BILLY WALTON from GEORGIA (9/22/2023 2:13 PM)

    Its really me....I fixed my caps lock .
     

    9/22/2023 7:31 PM  #5

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
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    Re: C4 question

    Thanks, Billy.

    Maybe this 4r70w I bought a few years ago is the correct answer.  I was thinking of using the c-4 just for simplicity. I have a T5 but not wanting to have to row any more.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    9/22/2023 7:40 PM  #6

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
    Posts: 2,431

    Re: C4 question

    I would go with the T5 and never look back ....I sent you a crossmember

    Its really me....I fixed my caps lock .
     

    9/24/2023 6:22 AM  #7

    Nos681
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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
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    Re: C4 question

    If the C4 is good shape, run it.
    That would keep it simple.

     

    9/24/2023 11:29 AM  #8

    Ron68
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    From: Mukilteo, Washington
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    Re: C4 question

    MS wrote:

    Thanks, Billy.

    Maybe this 4r70w I bought a few years ago is the correct answer. I was thinking of using the c-4 just for simplicity. I have a T5 but not wanting to have to row any more.

    Speaking as one who changed from a C4 to a 4R70W - it is really nice to run down the freeway at 60 doing 1950 rpm vs almost 3000 rpm with the C4. (That is with a 3.25 rear end)
     

    68 coupe - 351W, 4R70W, 9" 3.25 -- 65 convertible - 289 4v, C4, 8" 3.00
     

    9/24/2023 11:32 AM  #9

    Ron68
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    From: Mukilteo, Washington
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    Re: C4 question

    MS wrote:

    Thanks, Glen.  I found a 74 C-4 in Austin for $150, but have not agreed to buy it yet.

    I ran with a 1975 C4 behind my 351W and never had a problem other than the gear ratio on final drive giving me almost 3000 rpm at 60 mph.
     

    68 coupe - 351W, 4R70W, 9" 3.25 -- 65 convertible - 289 4v, C4, 8" 3.00
     

    9/24/2023 12:28 PM  #10

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
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    Re: C4 question

    I doubt this convertible will see that much long trip use.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    9/24/2023 12:41 PM  #11

    Nos681
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    From: Atlantic Mine, Michigan
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    Re: C4 question

    Ignorance is bliss, I still don’t have a tach-o-meter.

    I drove the 289/C4/3.25’s for 8 years with no problems or complaints.

    During the non snow covered road season, I drove the 65 to Wausau and Green Bay for monthly training.

    I like the C4 for the simplicity and no special electronics required.

    Besides, with all of tourists in Canyon Lake…you ain’t getting anywhere fast. 😁

    Last edited by Nos681 (9/24/2023 12:42 PM)

     

    9/24/2023 3:41 PM  #12

    BILLY WALTON from GEORGIA
    Carrollton, GA Bash Host

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    From: CARROLLTON GEORGIA
    Registered: 4/14/2013
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    Re: C4 question

    Ron68 wrote:

    MS wrote:

    Thanks, Glen.  I found a 74 C-4 in Austin for $150, but have not agreed to buy it yet.

    I ran with a 1975 C4 behind my 351W and never had a problem other than the gear ratio on final drive giving me almost 3000 rpm at 60 mph.
     

    3000 at 60 mph dont sound fun at all
     

    Its really me....I fixed my caps lock .
     

    9/24/2023 4:27 PM  #13

    TKOPerformance
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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,417

    Re: C4 question

    I don't miss my C4 at all.  3.50 rear trying to run 80MPH on the highway had the engine screaming.  But then , I don't really like automatics anyway.  3 out of 4 tagged vehicles I own are manual. 

     

    9/24/2023 4:58 PM  #14

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
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    Re: C4 question

    You could probably get a good AOD for not much more. They are a really easy swap with great highway manners.
    It’s one of my favourite mods, maybe #1.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    9/24/2023 5:27 PM  #15

    MS
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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,156

    Re: C4 question

    I am trying to swap Gaba my T5 setup from the 69 for his custom built AOD, but so far the timing is not working out.
    I plan to start working on the 65 convertible in February 2024

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
       •Thread Starter
     

    9/24/2023 7:58 PM  #16

    rpm
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    From: Bakersfield, Ca
    Registered: 9/17/2013
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    Re: C4 question

    Heck, swap some big gears in there. I ran 2.50s in 2017 to Florida with an FMX and enjoyed low rpm at speed. Wasn't bad off the line, but won't win too many drag races.

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    9/24/2023 8:49 PM  #17

    Bentworker
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    Registered: 9/17/2017
    Posts: 463

    Re: C4 question

    Random C4 info…




















     

    9/24/2023 11:35 PM  #18

    Cab4word67
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    From: Portland, Ore
    Registered: 4/06/2019
    Posts: 1,152

    Re: C4 question

    Ron68 wrote:

    MS wrote:

    Thanks, Billy.

    Maybe this 4r70w I bought a few years ago is the correct answer. I was thinking of using the c-4 just for simplicity. I have a T5 but not wanting to have to row any more.

    Speaking as one who changed from a C4 to a 4R70W - it is really nice to run down the freeway at 60 doing 1950 rpm vs almost 3000 rpm with the C4. (That is with a 3.25 rear end)
     

    I get 2000 RPMs at 60 with my C4 and 2.80 but gears. And Im just under 3000 at 75 so Im happy.
     

    Slammed Big Blue, ran over the varmints that messed with the Stang. Now all is good in the NW
     

    9/25/2023 12:23 PM  #19

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,936

    Re: C4 question

    1950 rpm@ 70 mph is what I get with an AOD, 3.25 gears and 225 60 R15 tires. On some long trips I’ve seen up to 24 calculated mpg per tank full on flat interstates.
    I had long trips in mind when I put 3.25 gears in it.

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

     

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