Don't grease the bearing as it comes packed with grease. Clean the input shaft collar that the bearing slides on and apply a very light film of grease to the collar.
Bench bleed the hell out of that TOB before trying to stab the tranny back in. Bleeding those things can be a pain.
I went to a McCleod racing TOB on my 05 only to have it blow it's seals within about 2200 miles. Went through the proper indexing for the bearing to clutch fingers and everything should have been good. Noooope.
Went out to my car and had no pedal one morning, looked at front of car to find giant puddle on the ground.
Went back to a factory style TOB. The original had 120k miles on it when replaced. Should have stayed OEM style.
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Important. If you buy an aftermarket clutch and use an OE style TOB it will probably have a concentric spacer included. Guess who didnt need the spacer for the aftermarket bearing and forgot to put it back in with the OEM bearing? Yup... got really good at removing and reinstalling the 3550 in my 2005 GT.
ALSO! Watch the thread engagement for the stock bolts for attaching the throw out bearing to the trans. If you put a spacer in there the bolts may only engage 2-3 threads and the casing for the trans is likely aluminum. Get spare bolts. Dont need to be anything fancy but be ready for it.
That was a 3650 in your '05 not a 3550. You are right about the aftermarket TB set ups. They will fail and usually quickly...more for race set ups. Been through a few of those, McLeod and Ram between 2 cars they all failed. I don't think there are any spacers provided for any clutch packages on the '15's, but I could be wrong. Like you said, I had to use longer bolts with a spacer on my '05