C6 drum modified for 5 clutches ,Also cpl questions on setup - Page 2 - 460 Ford Forum
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post #16 of 25 (permalink) Old 06-10-2008, 04:47 AM Thread Starter
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Thanks again Frank , will do ..
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post #17 of 25 (permalink) Old 06-12-2008, 05:10 AM Thread Starter
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Double checked clearance today with air, have .080" clearance between pressure plate and fwd drum. The taper on the edge of the fwd drum clears fine too . I used some plasticine/playdoh i use for piston to valve clearance on motors and verified all cleared good..
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post #18 of 25 (permalink) Old 02-20-2014, 01:30 AM
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as this is an old post , I'll update it
to make an original 3 clutch direct drum into a 5 clutch with standard thickness clutches and steels . when cutting a new snap ring groove - using a .150" wide cutoff cutter register in the original snap ring groove - register at the outer most side of the snap ring groove - then move out .340" and cut a new snap ring groove
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post #19 of 25 (permalink) Old 02-23-2014, 12:00 AM
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Revised directions for machining snap ring grooves in the Direct – High/reverse Drum

Factory 3 clutch Drum
Using an .125” wide cutting tool register the tool in the original snap ring groove on the outer most edge as a starting point
-Bring the tool out towards the open side of the drum
- when using factory thickness clutches and steels ( .078” each) 5 of each move the tool out .345” and cut new snap ring groove , This should give you a clutch pack clearance of .060”- .065” with the standard .078” snap ring
- when using Red Alto Power Pac clutches and Kolene steels (.061”) 6 of each move the tool out .300” this should give you a clutch pack clearance of .072”-.078” with the standard .078” snap ring
There are no Modifications required to the factory .342 thick Pressure plate

Factory 4 clutch Drum
Using an .125”wide cutting tool register the tool in the original snap ring groove on the outer most edge as a starting point
- Bring the tool out toward the open side of the drum .200” and cut a new snap ring groove this will give you a 7 clutch drum using the Red Alto Power Pac Clutches and kolene steels ( .061” thickness)
- The factory pressure plate need to be machined thinner to a thickness of .295”
- This should give you a clutch pack clearance of .084”-.091”
- The reason for the pressure plate thinning is so the pressure plate does not contact the forward drum on apply
-
- Hopefully this will clarify this machining operation
- Oiling mod pictures and pic’s of the machining operation can be found here
- http://i58.photobucket.com/albums/g2...psefz6ywze.jpg
- http://i58.photobucket.com/albums/g2...pspnofb64g.jpg
- http://i58.photobucket.com/albums/g2...ps62fljncg.jpg
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post #20 of 25 (permalink) Old 09-02-2014, 09:38 PM
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How many holes should be drilled for the oiling mods? I see by the pic that they should be staggered at 1.480 and an additional .500, just wondering what the correct spacing between holes should be.
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post #21 of 25 (permalink) Old 09-03-2014, 07:39 AM Thread Starter
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Just evenly spaced around the drum is fine. No real number to shoot for as long as they drain count the internal teeth and choose a pattern so they look neat. Chamfer the holes to clean any sharp bits. Also seen them with 4x1/4" holes centred.


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post #22 of 25 (permalink) Old 09-03-2014, 07:47 AM
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Thanks Greg. I know what I'm doing later today. Also just read the instructions for the Alto Direct Clutch 026757HP Powerpack. Seems if you are using a 4 clutch drum, you can put in 7 clutches/steels with this kit and no other mods. Any truth to this? Would save me machine time to not have to cut in a new ring. Link to instructions:

http://www.altousa.com/downloads/tec...-161-BM335.pdf
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post #23 of 25 (permalink) Old 10-13-2014, 10:39 PM
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the pressure plate that comes in the kit is way to thin for any application
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post #24 of 25 (permalink) Old 12-05-2018, 10:27 PM
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has anyone converted a c6 to a 2speed like they do with the turbo400's
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post #25 of 25 (permalink) Old 12-06-2018, 04:18 PM
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Frank is working on it. Talk to him to see where he is on it.
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