Tony,
I like you have replaced several S/Cs, from several different manufactures. Two of them being Wilwood. Now don't get me wrong the willwood S/C is a very good unit it just didn't work for me. Manly I think my problem was from over stroking the clutch pedal and subsequently over stroking the s/c. I say this because after the second willwood s/c that i blew out (it blew with only 40 mins of track time) I notice the shaft seal was worn on one side.
So I was frustrated and spent the next two track sessions riding shot gun in my friends vette and was jealous that he could shift when ever he wanted to. Thats when I decided to switch to a hydraulic throwout bearing (vettes have hyd. t/o bearings).
Go to
:: Quarter Master :: Home and talk with their tech guys. If you are runnig a ford transmission you will have to get the input shaft bearing retainer machined to fit the t/o bearing. Not a big deal any machine shop should be able to, the guys at racing clutches will give you the dimension.
They have detailed tech support and always answer the phone very good customer service.
You will have to take some measurements but it is very straight forward. In my case with a T-5 I had to machine down the input shaft bearing retainer for the trans down to 1.370". Additionally I had to get some additional hardware to replace the anti-spin stud that came with the t/o bearing. Again for a T-5 this was a section of all threat (metric 8mm x 1.25 pitch) and two 8 x 1.25 mm jam nuts.
But the most important thing is to install a PEDAL STOP so as to not over stoke the t/o bearing. I use to have to push the pedal completely to the floor while on the track which resulted in slow shifts and ultimately leaking and blow S/Cs. Now my pedal travel is only about 6". To set the pedal stop hight first carefully bleed the t/o bearing as to not over stoke t/o bearing, if you do over stroke the bearing you will push the bearing past its seal and you will have to order a rebuild kit to replace the o-ring (which I did). After you have bleed it put the trans in gear and have a friend try to turn the drive shaft while you slowly press the pedal. When the clutch disengages and the drive shaft turns set your pedal stop for an additional 1/4" of travel.
I know it sounds like alot of work but the result is great. If you have any questions you can contact me at 757-332-4545...Happy shifting Mike