Readylift 66-2025 5" Rear Block Kit - Ford Super Duty (1-PC Drive Shaft Only) 2011-2016
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Yes, if your truck has a one-way mirror. drive shaft made of two pieces
I'm not sure about a 450, but my 250 gained a little more than 6" over stock.
I had about 5 inches of bolt left on my 250, which was a very long bolt, and I had to remove the blocks because the drive angle was too far off. If you want my kit, I'll sell it to you for a low price.
Selected User Reviews For Readylift 66-2025 5" Rear Block Kit - Ford Super Duty (1-PC Drive Shaft Only) 2011-2016
They're the same length as the factory ones and only get you about 4 threads before they're tight and won't go any further. I'll attach a photo later. Factory length is 16 inches, so these kit was easy to install, but you'll need to spend $100 on 18-inch u bolts instead of the ones that came with it.
Excellent product that was simple to set up and came with all of the necessary components.
Kit is fantastic.