Stay with the 4.11's. Since you already have a crawler tranny, you will have spares with 4.11 3rd members. THat has been the biggest problem going to 4.88's.
You shell a 3rd member and you are out of business unless you spend big $$ having yours rebuilt.
If I had it to do over, I would build a good traction bar and grab 2 or 3 extra 3rd members and be done with it!
My .02, sorry. Got mine at Reider Racing, they were Precision Gear.