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The piston is larger, I've held it in my hands. Just an FYI I have 6 clutches in a 4 clutch drum with .110 clearance , dry , in the clutch pack. To use the TCS drum with the higher snap ring you might have trim the rear clutch retainer a tad to clear the snap ring , I did it in about 10 minutes in a lathe .



JohnRR is right, I had Marks drum in my hands. The apply piston is bigger and the drum uses all available surface. The groove the stock drum has for the front pump vent is not there and you trim the plastic for this drum.



I forgot about that, I'm pretty sure the regular size drum from TCS is like that also, I have one here I'd have to look. They also put the check ball in the wrong place, at least on the early release billet std. piston drum I have , it's towards the middle instead of near the outer edge. of the piston recess and the grooves that the steels sit in are a little tight , the steels may need some minor grinding on the ears so they move freely up and down.