Well comeing from the offroad world where no axle is too big I would say what you would want to do is either get ahold of a SF 14 bolt w/ the 9.5" ring gear out of a 4wd if you have 4wd or a 2wd if you are 2wd as the WMS widths are different. Another option is to get a FF 14 bolt, the down side is that they are big heavy and virtually indestructable, they are also only in 8 lug versions. You can get custom hubs made to convert to 6 lug but very few rims will work with them due to the large diameter of the hub.

So here is what I would do, go out looking for a 14 bolt SF in a 6 lug version (assumeing that you are 4wd). This axel can be found in OBS 1/2 tons with the towing package along with a few other packages, it can also be found in light duty 3/4 tons that are 6 lug. You can tell a 14b SF by its rounded diff cover and the fact that the diff cover is held on by 14 bolts. It differs from its bigger FF brother by the shape which is more squareish but also held on by 14 bolts.

SF 14b



FF14b



Conrad