"Generally" speaking,if I can still see a decent pattern on the clutches, I don't change them, they are still good.....not sure of any or exact diminsions of the clutch pack, it's put together with shims to fit the carrier.......kinda trial and error,or better yet, expirence.....
My car sometimes sits for 2 or 3 months without moving and when it does, it will occasionally make some weird sounds, seems to go away once I get down the road a few miles and the
oil/gears warm up and begin working properly again........
if your not sure, take it to someone that has done these before and let him check it out......
They are pretty stout and can take a lot of abuse. The one in my car came out of my dad's truck, it had 85,000 rough miles on it then and all I did was change the ring/pinion and put it in my 65 fastback...since then, it has seen over 100 1/4 mile drag passes, at least that many hard stop lights starts,about 1500 to 2000 miles on 3 road courses and 25,000 miles of city/highway driving....I change the
oil in it every 10 years whether it needs it or not!!!!!
David