Jeff's 727 rebuild thread

Great thread. Going to be looking at my transmission again. I rebuilt it many years ago,but it only has about 100 miles on it, maybe 200.
727 with a cheetah mrvb.
Had a few questions maybe someone her could answer.
Which band lever would I use for that valve body?
Would I use 12 springs behind the reverse/high clutch piston, and the two springs in the servo..
This transmission I believe is slipping somewhere. When I had it at the track it was going through the traps at 6500 rpm, but only 113 mph. I used the calculators and others have said the mph should be quite a bit higher, like 125 mph. It has 4:10 spool, 27.8 diameter tire.
Not sure where to look for the slipping issue.
Oh, and Jeff, if you think your transmission is fun to take out and put in, you should try mine. 440cid with pro part headers. That transmission is fun .