Tolerance for C6 Forward drum
Posting Guru
Joined: Apr 2005
Posts: 1,035
Likes: 2
From: duncan oklahoma
Yes I build transmissions for a living, since 1964 and retired from it after 40 years.
I am not sure if you are attempting to be nasty or funny with your statement of leaving out parts.
Manufacturers install some parts for customer demand or for something to brag about to increase sales that don't really work that well.
The wavy spring in the forward clutch is one.
There are shift kits used and quite often an item or items are omitted.
Modifications are made to the cooler supply and return.
Holes are drilled to enhance a shift or supply better lubrication to a certain area.
Holes are also drilled in drums to exhaust residual fluid.
As for a harsh engagement allowing too much clearance is one cause.
That's why I never go over .005 clearance per fibre plate in the forward drum.
With a forward 5 fibre drum @.005 per plate gives .025 clearance.
Increase that to .008 and you have .040.
.012 and you are at .060, nearly 1/16".
Clearance in the direct drum can and should be a bit more because of the terrific speed at which the fibre plates are spinning when in first or second.
The extra clearance there helps to prevent partial application or drag due to residual fluid in the drum.
The Ford number of the wavy spring, which was introduced in 1976.
D6AZ-7E085-B
As for slamming into reverse the omitted wavy in the forward drum has diddly squat to do with it.
In reverse the rear and direct clutch are engaged. The forward clutch adds nothing.
I am not sure if you are attempting to be nasty or funny with your statement of leaving out parts.
Manufacturers install some parts for customer demand or for something to brag about to increase sales that don't really work that well.
The wavy spring in the forward clutch is one.
There are shift kits used and quite often an item or items are omitted.
Modifications are made to the cooler supply and return.
Holes are drilled to enhance a shift or supply better lubrication to a certain area.
Holes are also drilled in drums to exhaust residual fluid.
As for a harsh engagement allowing too much clearance is one cause.
That's why I never go over .005 clearance per fibre plate in the forward drum.
With a forward 5 fibre drum @.005 per plate gives .025 clearance.
Increase that to .008 and you have .040.
.012 and you are at .060, nearly 1/16".
Clearance in the direct drum can and should be a bit more because of the terrific speed at which the fibre plates are spinning when in first or second.
The extra clearance there helps to prevent partial application or drag due to residual fluid in the drum.
The Ford number of the wavy spring, which was introduced in 1976.
D6AZ-7E085-B
As for slamming into reverse the omitted wavy in the forward drum has diddly squat to do with it.
In reverse the rear and direct clutch are engaged. The forward clutch adds nothing.
Cargo Master
Joined: Jun 2003
Posts: 2,982
Likes: 7
From: Somewhere Saskatchewan
are you setting the forward clutch clearance tighter because forward isnt a shifting clutch.dosnt the wave spring help soften the enitial forward engagement.not trying to be dumb,just keeping my mind open to other trans builder thoughts and ideas.closed mind makes you limited to your future.
__________________
ASE MASTER TECH FORD SENIOR MASTER TECH
Yes, because I feel after while the wavy has a tendency to flatten out to the point it is not wavy anymore.
That produces unwanted extra clearance.
An exchange of ideas is always welcome, that's how stuff gets better.
This is not in referrence to you but many people say stuff like "you dumb SOB, that's not how we did it".
I am always open to suggestions.
40 years of building transmissions has taught me lots.
__________________
ASE MASTER TECH FORD SENIOR MASTER TECH
Yes, because I feel after while the wavy has a tendency to flatten out to the point it is not wavy anymore.
That produces unwanted extra clearance.
An exchange of ideas is always welcome, that's how stuff gets better.
This is not in referrence to you but many people say stuff like "you dumb SOB, that's not how we did it".
I am always open to suggestions.
40 years of building transmissions has taught me lots.
New User
Joined: Jan 2008
Posts: 0
Likes: 24
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From: Simi Valley, CA
I don't do too many auto tranny posts unless they pertain to flexplates.
Thanks for posting the pic...now ppl will see where the 7E085's fit.
Hemi-Eater's C6 illustration doesn't show them.
Thanks for posting the pic...now ppl will see where the 7E085's fit.
Hemi-Eater's C6 illustration doesn't show them.
Thread Starter
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New User
Joined: Mar 2008
Posts: 22
Likes: 0
Well i got it all back together, ended up having room for the wave plate in the forward after all. yeah mine did have the wave plate in the low/reverse pack as well. So i ended up with 4 clutches in the reverse/high and 5 in the reverse/low and forward drum. R servo and FF lever. Everything went back together real easy. Air checked it and seemed fine, no leaks. End play before rebuild was about .030 and after rebuild was at .023. Thanks again everyone and i'll let you know how it works once i get it installed
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