39.5 Iroks... 9'' or Dana 60?

[71fordkid]

im putting a set of 39.5x13.5 interco super swamper iroks on my jeep. im also putting a bump rear axle in it as it is only a quarter inch wider on each side. what i need to know is this:

Will the 9'' hold up to the 39.5's, or should i use the d60? im talking the 28 spline, 67-72 ford 9''. i dont know any details about the 60 but i believe its a full floating axle. it will either be welded or spooled.

id use the 60 no matter what, but im concerned about the loss of ground clearance. i wanna know if i can get away with using the 9'' to save some space.

[papabug71]

If it were me, & I had both rear ends, I would go with the DANA60. Its a sure bet it will hold up. I dont know of anyone on here that has 39" tires on a 9". Thats alot of meat. The big bronco guys rate the 9" & the DANA44 as the same. I however think the 9" is a stronger rear than the 44.

[71fordkid]

im leanin towards that too. i got a buddy who will give it to me for 50... might as well.

[Redcap]

I personally would use the D60 unit, the 9" is a small and on the weak side for the meats you want to run. If you are really worried about ground clearance, grind the D60 housing.

[zakt]

I have a 98' wrangler and also might put a bump rear in it but I have a D70 and a D60. Thinking lifting it and running 35" boggers with ARBs so most likely the D60...

[4x4freakfe427]

Well if the 9" had 31 spline it would be alot stronger than the 28 spline they don't hold up to alot of abuse.
Some times the bad things about a 9" is that it has a lower pinion than a 60, so you would have to rotate the axle a little more, but if you are lifted a long ways to clear the tires,and you have a short drive line you would have to rotate the pinion up alot so ujoints don't bind up.

The dana 60 will have the 8 lug where the 9" will have the 5 lug, if that don't matter use the dana 60 they will take alot uf abuse and keep on trucking. I had a dana 60 that was welded up in my 67 highboy and running the 390 and running 42's as a daily driver and it took me a year to finaly break an axle and I am alot heavier that your jeep.

Now the dana 60's have different spline counts some are weak some are strong. And the last thing is ground clearance, to me I would not worry about it, but you can cut and grind down that little extra casting ridge off of the bottom you would gane about an inch. I am not sure if I helped you out but good luck with what you are trying to do.