Well, think about it -- for 4 days you did nothing but go from full-on hard acceleration in the lower gears to full-on engine deceleration in the same or a lower gear.
You did this thousands and thousands of times ....
I can't think of anything that would stress your primary engine to transmission HiVo chain any more than that. You beat your poor Hurley to death trying to keep up with them puny miserable little pittyful grandma sickles ...
Your gear oil in that primary case needs to be changed, for sure. If you can get it to quit slapping, go ahead and sell it next spring -- the slapping issue is gonna come back and get right expensive 'cause them primary chains don't come cheap.
Me, let me show you the only thing that my Savage desperately required when I returned home -- nothing mechanical mind you (other than a little adder of motor oil in the gearcase) but a desperate need according to my wife none the less !!
(my wife mentioned it to me just as soon as she went out into the garage).
Complete De-PossumificationPics that follow show the need in increasing order, so you can see the general filth and mentally separate it from the hard wormy possum guts and the dried thick possum yuck .... BEFORE

The possum guts were a fair amount larger looking when they were still fresh, but they have dried out and shriveled up pretty much into hard wormy looking things in these pics -- still were pretty fragrant though which is why my wife insisted I go give my bike a bath if I was gonna leave it in the garage ....
Me, I'd a thought they'd have washed off in all the rain and road spray, so I thought nothing of it until she took me to task over the "bad smell" out in the garage.
(I also caught her sniffing & checking out my pants legs on the pants that I wore too -- she wanted to wash them again if they needed it. I think she washed all my trip clothes again, on GP.
Turns out my shoes, they really did need it.) AFTER WASHING
that wuz one heck of a trip, lemme tell ya .... dem durn possums, they pops like water balloons and sprays yuck all over the place when you hit them a going that durn fast !!And here is a set of cute possum, chipmunk, and squirrel pics, so we can get the proper amount of cute credit for what all we ran over while on the trip.