C6 Specification Question
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Elder User
Joined: Jun 1999
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From: LAT 46.55501° & LON -122
C6 Specification Question
I am rebuilding the C6 on my '69 F250 and I am trying to figure out what the pressure plate to snap ring clearence should be for the Reverse-High Clutch. My book says it should be .022-.036, but I am machining the drum for a second snap ring groove to allow for a total of 5 clutches. The .022-.036 specification is for a 3 clutch pack. Would it be the same?
I have posted this in the Tranny Conference section also, but I think some later 70's trucks may have originally came with the 5-clutch pack, but I do not have a later model repair manual to see what that specification should be.
I have posted this in the Tranny Conference section also, but I think some later 70's trucks may have originally came with the 5-clutch pack, but I do not have a later model repair manual to see what that specification should be.
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Elder User
Joined: Jun 1999
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From: LAT 46.55501° & LON -122
C6 Specification Question
Thanks, oz. B&M Really had me worried when their instruction manual for the Transkit I got called for .060-.080. The clearence I had with a .075 snap ring was about .026, and I could se no way to achieve this even with the thinnest available selective snap ring. So I called B&M and they said it must be a typo error. He said to go with .010 per clutch (which would be .050); however, he also said my .026 would be just fine. For a component as important at the Direct Clutch, you would think that B&M would have their act together and check for such typos and know exactily what it should be. Am I right that if it was too tight there would be too much drag/heat while in 2nd; and too loose would cause a lag and slippage during 2-3 shift?
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Joined: Dec 2000
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C6 Specification Question
You are right. If they are too tight the clutches will drag against the steels and burn. Too loose and there is too much slippage when shifting. Good luck. Let me know how the tranny works when you finish.
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Joined: Mar 2001
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C6 Specification Question
I have built many heavy duty C-6's and here's what I learned over the years. This is tested and proven. Not opinion! When going to a 5 clutch pack, the problem is there is so much surface area, the clutches get traction so fast that engagement happens too fast. This seems like a 2-3 slip when really all it is that 3 applies faster than 2 can release. What most guys end up doing is using the forward apply plate upside down in the direct drum to allow space for a 4th clutch. What most guys don't realize is as you add clutches you must add space. So, if a 3 clutch is a 22-33, you are going to need a lot more with 4 clutches and even more for 5 clutches. My reccommendation is .050 minimum. This clearance will delay the apply enough to allow for 2nd release. It should work well. Also might try a Gil Younger "trans-go" no yo-yo valve body reprograming kit. This will dramatically increase the load capacity of this trans. Hope this helps. Brent
injectionspecialties(No Email Addresses In Posts!)
THE SURGEON GENERAL NEVER SAID A THING ABOUT SMOKIN' A CHEVY!!
injectionspecialties(No Email Addresses In Posts!)
THE SURGEON GENERAL NEVER SAID A THING ABOUT SMOKIN' A CHEVY!!
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Elder User
Joined: Jun 1999
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From: LAT 46.55501° & LON -122
C6 Specification Question
I found some thinner steels and used a .067 snap ring which gave me about .040-.043 total clearence. Hopefully this is enough clearence but not too much; I'll give it a try anyway.
What are your guy's opinion on using the R-code servo assembly for towing duty, or is this an upgrade that's basically for racing?. It is an obsolete Ford part, but Superior makes what they call a Super Servo Kit to replace it for about $160. I currently am using the L-style cover if that makes any difference. I suppose it is something I can easily add later, but if it won't make the C-6 perform better or last longer for what I am doing, then I won't spend the extra time & money.
What are your guy's opinion on using the R-code servo assembly for towing duty, or is this an upgrade that's basically for racing?. It is an obsolete Ford part, but Superior makes what they call a Super Servo Kit to replace it for about $160. I currently am using the L-style cover if that makes any difference. I suppose it is something I can easily add later, but if it won't make the C-6 perform better or last longer for what I am doing, then I won't spend the extra time & money.
