I REALLY beg to differ on this. Sure, disk brakes are great. But once you take off your drums, you lose your emergency brake. The stock drum E-Brake will hold a 60 on hill. Without it, you put more stress on your transmission, and really hurt your ability to regulate tough starts when wheeling.
If you go with a rear brake conversion, and still want an e-brake, you need to either swap in an entire FZJ80 rear end, or put on a T-case brake. (Ask Trencha about his and see how he likes it.... )
Frankly, theres no cost-effective way to beat the stock rear drum brake performance in MY OPINION. All youll end up with is a truck with no e-brake that has marginal brake performance increase, or a truck with a mediocre e-brake, and marginally improved brake performance.
Another note. If you rupture a brake line on trail, and dump your entire MC reservoir in the dirt, your going to wish you kept those drums.
Just my 2 cents.
From what Iv learned from Gary at Mudrak, we really dont recommend disk conversions in the rear unless you swap in a whole FZJ80 rear axle.