Bud, I agree with you on rear disc brakes and here's why;
Since we all know that rear drum brakes have to be strangled by a proportioning valve,it follows then,that drum brakes are more than adequate for the rear of a streeter. In fact if you run the rears straight to the M/C, and with 4 same sized tires mounted, you can get yourself into trouble really,really fast.
Soooooo, why exactly would a streeter want db's on the rear? Oh, wait, I think it's coming to me; cool-factor.To each his own, I guess. But I wouldn't spend a nickle on rear db's for my streeter .
Here's one for you; I assembled my car in 99. I took the P-valve out a couple of years later when the 295s went on. That was about 125,000 miles ago.In that time, I wore out the original circa used 1969 shoes, and replaced them with other used circa 1969 shoes. This tells me a few things. I am easy on brakes, or, circa 1969 shoes have magical qualities,or, the rear shoes are doing almost nothing,perhaps because the mechanic who installed them (me) did something wrong or is an; pick your own adjective.
The car is, or has been,the best stopping street-car I have ever owned, and the second best I have ever had a ride in.And various other operators and passengers have concurred, on many occasions.
I,of course, cannot say the same for a non-street car,obviously.
BTW
In a trac-loc/powerloc rear,One cannot drive the buttons out from the axle tube side. And if you could, it would immediately fall into the guts to be crushed by some other moving part, perhaps wrecking said guts. The chunk has to come out, the case disassembled and the buttons manually removed. Occasionally, as said earlier, the buttons are not very secure, and will sorta stick to the end of the axle as it is withdrawn.Sometimes it will fall off before the axle end emerges. If a button ever falls out/off when you pull an axle (not common, but for sure possible), you may never know it,until it jams between a couple of ring-gear teeth.
Lots of guys have just fabbed up spacers or chopped off the axle ends. I'm just saying.