There are two things about this, as I said the same thing in 1980.
1. Most guys never change between street gears and drag gears. 99.9% of the time, guys end up leaving the street gears in.
B. It's a pain in the *** to change out a third member. It's a messy, heavy job. On a good day, I could do a swap in about 1.25 hours. It wasn't worth it. I left the 4.56's in and sold the street gears.
Consider the 60 long and hard. I have an 8.75 and I'm going to swap it for a 60. It isnt worth tearing **** up.