look guys , if you put your truck up on a lift with the t.c. in rear wheel drive, and run it at hwy speeds everything turns at the same speed very shortly, this is why I don't bother with lockouts. The main trucks that need lockouts are the one's with locking diff's in the front or midddle axel to prevent binding, and long haulers for mileage and some wear. I only make short runs in my m35 and want to stay dry when I need 6x6.
As to most 4x4 ratios there were some that had 4.10 and 4.11 mismatch but it is not considered proper, if you can match exactly you are better off in the long run. Now the thing is most civi trucks have open or limited slip diff's that even on pavement will releave most of the binding. I have built trucks for mud bogging that had diffrent ratios front and rear but even some of them question if it works.
I worked in a driveline shop and I have a A.S. in heavy equipment repair.