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Old 09-15-2003, 10:45 PM   #1 (permalink)
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Clutch Pack Clearance?

I measured the Clutch Pack Clearence on my c4 and i got: 0.35 for the Reverse High Clutch Pack, and i got .030 for the Forward Clutch Pack. Does that sound ok?

I measured it again but this time i did not force the feeler gauge in between the friction plate and snap ring i just kept checking with feeler gauges until i found one that slid in between the friction plate and snap ring well and did not have up and down movement while it was in between the friction plate and snap ring. Is that the correct way to use Feeler Gauges?

Using that method i got .022 for the Reverse High Clutch Pack, and .025 maybe (.026) for the Forward Clutch Pack.

please let me know wht you think thanks.
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Old 09-16-2003, 02:08 AM   #2 (permalink)
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Clutch Pack Clearance?

Think .005 per plate is about the norm.
Your clearence sounds about right.
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Old 09-16-2003, 03:16 AM   #3 (permalink)
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Clutch Pack Clearance?

Remember the tighter the clutch pack the more friction and heat when the clutch pack is disingaged,to tight and you can wear the pack out in very little time, what will be the use of the car? if it is a street driver/once in a while race ,I think I would open it up a little/Drag only car those clearences are good

[ This Message was edited by: Foxfire on 9/16/03 3:17pm ]
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Old 09-16-2003, 03:29 PM   #4 (permalink)
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Clutch Pack Clearance?

Foxfire are the .035 Reverse High Clutch Pack clearence and the .030 Forward Clutch Pack Clearence good for a Drag Only Car?

please let me know thanks.
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Old 09-17-2003, 09:19 AM   #5 (permalink)
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Clutch Pack Clearance?

Pretty much so! almost every thing you read about a C4 has to do with setting one up for drag racing; the factory clearences are for cars that must see all kinds of temps, If you push your car thur the hot lane you can really tell the difference with a tight clutch set,but it sure makes the difference in the run A hard hitting C4 will loosen your teeth when it hits 2nd
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Old 09-17-2003, 11:07 AM   #6 (permalink)
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Clutch Pack Clearance?

.025-.035" is good for the foreward drum(.005" per clutch). Those clutches are always engaged once you put it in gear so they can be tight. The direct clutch pack needs to be a little looser(.007-.008" per clutch for street and .008-.010" per clutch for racing) because those are only engaged in high gear and will create drag/friction in 1st and 2nd gear even with the loose .010" per clutch clearance but the drag really becomes noticable in the .05-.07" per clutch clearance range.
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Old 09-17-2003, 01:06 PM   #7 (permalink)
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Clutch Pack Clearance?

Loose clearances in the direct clutch are good for going a little faster but the clearances at .030-.040 will let the cluches live longer. I set my brothers and my tranny up that way and get great life out of the clutches. A fellow racer who runs a 600CID to 8.40's also tightened his direct up to about .035 and saw a big increase in clutch life.

If you want to know about building C-4's read this thread
http://www.fordmuscle.com/phpBB/view...6&forum=13&112

Those 7 pages stepped my C-4's up another level from where they were before.

[ This Message was edited by: Mario428 on 9/18/03 1:08am ]
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Old 09-17-2003, 07:24 PM   #8 (permalink)
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Clutch Pack Clearance?

The posts on C4s always have good responses,I have always thought that Ford's limits were to loose .050-.071 in the high clutch .045-.040 seems to take a lot of the mushy out of the shift and reduces the noise.netural clutch is .025-.050 I go for .025/ as always my main concern is the main shaft end play .008-.010 max,that gets the bushing all the way on the delivery sleeve and takes the wobble out of clutch drum; make sure to push down on the pressure plate in both clutch packs to measure/ feelers guage should slide in with a slight drag
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