C4 or C6? - 460 Ford Forum
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post #1 of 19 (permalink) Old 11-02-2017, 11:59 PM Thread Starter
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C4 or C6?

I'm making the mental list of drivetrain parts for the '32 and have come to the trans. I really like how the big bell/short tail C4 worked out in the '31 but that is behind a stock 5.0 HO. The C4 weighs less and I know what parts I'll need to mate one to the 545, but the question arises.... which can be built reasonably to handle 6-700 hp in a light street car? Can a C4 be built/modified to handle reasonable HP and torque or am I better going C6?
Pros and cons of each?
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post #2 of 19 (permalink) Old 11-03-2017, 12:26 AM
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For a light street car yes a C4 will do ok. But at that power will need mods. What's your list parts you have in mind?

Or a C6 could be built with mostly factory parts , add in the right amount clutches and a good valvebody
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post #3 of 19 (permalink) Old 11-03-2017, 01:03 PM Thread Starter
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Sounds like a C6 is the way to go. I've been reading about some of the mods... extra clutches, oiling mods, etc. Apparently, the C6 is about 30-35 lbs heavier so the weight isn't that big of a deal, and the longer tailshaft won't be a problem with a triangulated 4 bar. I'm guessing this car will come in around 2500 lbs and will need about 4" of setback.
The engine going in it is a D9 block 12.5:1 forged internals with SCJ-B heads, Torker II and QF 950 DP. Guess I'll have to run the Sanderson shorties unless someone knows another vendor making shorties or block huggers for CJ ports. Scotty'll have to grind another cam, too.
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post #4 of 19 (permalink) Old 11-03-2017, 11:16 PM
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C6 would be the most cost effective.

A C4 is good but by the time you add in a good front planet , input shaft etc , those items alone would almost pay for the basic rebuild parts for a whole C6
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post #5 of 19 (permalink) Old 11-05-2017, 08:31 AM
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Definitely a C6 for long term cost effective durability. Yes it is heavier but so what. It is a street car. If anything that extra weight on the rear wheels will help get a little more traction for you. ....but you will still be able to blow the tires off the rims when you want to.

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post #6 of 19 (permalink) Old 11-05-2017, 07:57 PM Thread Starter
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Definitely a C6 for long term cost effective durability. Yes it is heavier but so what. It is a street car. If anything that extra weight on the rear wheels will help get a little more traction for you. ....but you will still be able to blow the tires off the rims when you want to.
Yes, I will.....hehe.
Doing a little more research I've found Ford made a short tail C6 used in 70's F250's but reliable info beyond that is hard to come by. 4X4's with a divorced xfer case had the short tail but I'm looking for that trans with the BB bellhousing (would have been 351m/400) not FE. It sure would help with drive angle on this short of a wheel base and having to set the engine back about 4".
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post #7 of 19 (permalink) Old 11-06-2017, 10:19 AM
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Yes, I will.....hehe.
Doing a little more research I've found Ford made a short tail C6 used in 70's F250's but reliable info beyond that is hard to come by. 4X4's with a divorced xfer case had the short tail but I'm looking for that trans with the BB bellhousing (would have been 351m/400) not FE. It sure would help with drive angle on this short of a wheel base and having to set the engine back about 4".
Yes. There are short & long tail shaft C6 transmissions. You can convert from one to the other. All you need is the correct tail-shaft housing & output shaft. Everything else is the same. I did this once a long time ago. All of the internals of the C6 have to come out to change the output shaft but it really isn't that hard.

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post #8 of 19 (permalink) Old 11-06-2017, 03:07 PM Thread Starter
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Here's exactly what I'm looking for though this one is on Ebay and in Georgia. Freight would be a killer i'm sure.
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post #9 of 19 (permalink) Old 11-06-2017, 04:24 PM
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Another thing to keep in mind is that those 70's 4x4 trannys for the divorced T-case didn't have a slider on the extension housing. The slider was built into the driveline yoke....at least for the FE apps.
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post #10 of 19 (permalink) Old 11-06-2017, 05:46 PM Thread Starter
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Another thing to keep in mind is that those 70's 4x4 trannys for the divorced T-case didn't have a slider on the extension housing. The slider was built into the driveline yoke....at least for the FE apps.
Rob
True, that's one reason I want it. I prefer to run a splined d/shaft than a slip yoke. This is the same type of trans/driveshaft setup I put in my '31 and it works great.
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post #11 of 19 (permalink) Old 11-13-2017, 07:26 PM
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Slowride,I believe the short tail truck c-6 you are referring to is the one used in a lot of late 60's early 70's FE powered 2 wheel drive pickups.It had a short cast iron tailhousing but used a bolt on yoke instead of a slipyoke,and in longbox trucks was typically used with a 2 piece driveshaft(not sure about shortboxes).By the time ford started putting 460's in the mid 70's trucks they had reverted back to the long tail trans with a slipyoke all the ones I've seen were for FE never seen a 460 version,but if your building a trans there's no reason why you can't use those parts from a FE core,you'll just need 2 cores trannies to build 1.Also the tailshaft is coarse spline.This trans was also used in FE powered 4x4's with divorced t-case,but since Ford never offered 460's in 4x4's in the 70's you won't find 1 unless you stumble across 1 someone built for a swap.
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post #12 of 19 (permalink) Old 11-13-2017, 07:35 PM
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Just saw the pic of the trans.,wonder if maybe it was for a 351m or 400 but I didn't think they started using those engines in 4x4's until they swapped to the married tcase,bet it is one someone built.
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post #13 of 19 (permalink) Old 11-13-2017, 10:50 PM Thread Starter
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These were production trannies in F250 long bed 2x and divorced case 4x4's with 351m/400/460's.
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post #14 of 19 (permalink) Old 11-15-2017, 02:00 PM
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In that case you should have no trouble finding 1 locally.
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post #15 of 19 (permalink) Old 12-01-2017, 10:15 AM Thread Starter
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Found one but not locally and it'll be trucked in. Now on to modifications. Automatics are not my deal so have been doing a little reading up. I've read of oiling and roller bearing mods for a C6 that are recommended for higher horsepower applications. I'm not talking about big HP here (7-800), so anyone have feedback on what the trans will require for these power levels, street/strip use in a relatively light car? I'll also have to start thinking stall and gearing to use with a 30" tall tire as well.
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