Hello...I am looking to change from my 4:88 to 4:30 in my 01 F450. I have found a 03 Dana 135 with 4:30 in it. Can anyone confirm if this is a direct bolt in. As well, are my brakes on the Dana 80 the same as the ones on the Dana 135?

The diff I am looking at was on a dump truck that has 100,000 miles on it. I have not seen the gears.....any thoughts on what type of condition this massive diff would be in with this amount of miles.

Thanks