C4 high clutch pack clearance versus E.T.?

When i went back together i tightened up the high drum to about 40 thousands and added a kevlar band and H servo instead of R. Tranny does not kick the same and has seem to lost about 5-7 hundreds somewhere.Need to check line pressure if i can get a gauge. The input shaft did have alot of drag compared to usually really loose. I figured it was cause of forward be tightened to 25 thousands this is with 5 on 5 clutches , forward wont effect drag like the high will in low and sec. I did do a 100 ft wheelstand clocking 60ft. with my backs, that was fun still a 1.35. I am using type F fluid maybe should use mercon 3, i thought it would drag more from tight clearances though. Didnt brake anything so that was good!! Car power is flat as can be so it might be something else, timing is all over the place and about to get rid of the Barry Grant 750 for a while lol. car been 6.18 at 115 in 1/8.. Needs more cam also xr304r kinda small and got get it to hook tied down some= good track. Any advice on build would be appreciated since this is my first bigblock and dont want to wait till next yr. to get it lined out, thanks...,ED
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The forward clutch should be on .050 with 5 clutches .This drum works in all foward gears and will burn up very quickly if it is to tight and slow the vehicle down.

I stated my first post wrong .035 to .045 on the forward clutches and for the reverse high drum or clutches .050 . The Tight clearance on the direct clutch pack causes drag in first gear and the clutches are being spun in the oposite directions as the steels.

When you put the clearance to tight on either clutch pack it puts a drag on the whole rotating mass which slows the car down . This creates heat burns the trans up longevity is gone . As transmission fluid gets warm it expands and so does the clutches and steels which at operating temps the clearance will also change. It will also change the shift feel of the trans . The input shaft should be easy to turn by using your thumb and pointer finger. Buy the way John I saw more power Glides being changed out this weekend than I did C-4s or C-6 transmission LOL

Na not going their either Brotha ! That is so true they each have a home Forward clutch is applied in all forward gears it is not aplied in reverse.

I had a 6.80 smallblock car slow down a whole tenth after freshening trans. After a month or so of driving the ET returned. It was my first rebuild and dont remember the clearances. It was most in the 60 ft. Clearly could see the differance. I took some advice on Yellowbucket and now i wonder if that was for a race car only. They say high gear first to go. The c4 is holding up so far this time.

One big thing that affects drag in the lower gears is ..

Centrifugal apply. If going over 6000RPM and using a constant pressure manual valve body, a small .040" bleed hole in the drum helps

where would you put a bleed hole in the high drum? Maybe on the bottom? I want to check and see what kind of pressure i really have. THousands of miles can weaken pressure releif spring. I think i am going to rollerise it this winter and put some drain holes in high drum on the side of it.

Se pic 7 + 8 here Ed. Drill it outwards on an angle
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