Was this 14 Bolt FF from a GMT 800? Those were approximately 3" wider. Also, the spring perches and the bounce pads were in slightly different locations. The mount for the brakes, at least the disc brake version, is a different pattern. We had to cut an weld new ones in place on ours from a GMT 800 to make it work with the GMT 400. Haven't done the install yet; that's a winter project. This conversion will get us disc brakes in the rear.Ok, I got the rear end painted and bolted into the truck. All that is left is to get the drive shaft hooked up. I called the local Napa and they say they have the right conversion u joint in stock. I'll pick that up tomorrow and hopefully have that and the breaks hooked up.
Turns out, this 14 bolt sf is wider then the stock 10 bolt. I can't remember exactly how much now but I think it's a 3" difference. By the looks of it , the front and rear are about the same width now.
Another thing I noticed is the leaf spring perches on the 14 bolt rear are slightly shorter then the 10 bolt leaf perches. Not a big deal cause the back end was much higher before and the height difference is not really noticeable. Maybe has something to do with the increased axle tube diameter on the 14 bolt.
Curious, how much did you pay for the 14 bolt FF axle?