so, if I read the link you sent correctly - THIS would bolt onto my current carrier:
http://www.ringpinion.com/b2c/Produc...nd_Pinion_Sets
And voila, it's a 3.73 now.... Concur, 3.73 and 4.10 can bolt to same carrier. Very interesting..... Glad my truck came with a D60 in case I ever get around to doin this.