I love the low speed torque multiplication from the auto. But I love the 7000rpm clutch drops in the middle of a mud hole. I personally prefer the auto but I wheel both.
Usually they block them off to create a restriction to allow proper heat absorption. The temp of the coolant may be cooler but the engine may be running warmer if the coolant can't absorb the proper heat. But really hard to tell if that's the case.
I buy rebuilts for that for a reputable driveline shop. I know new is pricey. The yoke is replaced when they rebuild it. Usually costs 45 bucks for a spicer one.
Cv shaft is a must in my eyes. Provides optimum driveline cancelation. No vibes. More travel. No bind. Etc. I can't think of one reason not to use one. Why not get yours rebuilt?
Mine weighs 10,000 lbs. lol. I get 4 mpg with my truck. I sold my little one I used to pull with my jeep now the wife has to drive the jeep when we go out. I like this build. Good job guys.