I think bobby long make his super birfs for dana 44s.
I don't think Bobby does them any more... At least not for the d60s... I could be wrong, give him a call to make sure...
We run them in our TJ Rubicon. It broke two front shafts with the stock 31s before the RCVs. For the price of the shafts, you can find a Dana 60. I guess it just depends on your vehicle and how you want to use it. I have seen people spend $3000+ on a Dana 44 and after it still not holding up, they start building a Dana 60.