Here are pics of my rear blocks. It looks like someone stacked two blocks together. Does this seem right from the factory or did the previous owner do some rigging?

 

looks good to me..i think my top block looks a little taller though..

 

Nope, thats stock. The bottom one is the perch, it will have a centering pin in it to stack the block on. the block also has a centering pin to stack the spring on, and the top or the spring has one that rides in the u-bolt bracket.

PS. That stuff aint light either. expect for your new 4" blocks to weigh about 12LBS each.

 

Looks just like mine does...should be fine!

 

Never looked myself, but if you look closely at the top picture directly to the right of the left U-bolt, it looks like the bottom piece is welded to the tube. Maybe its a platform for the blocks to sit on so they dont roll around

 

I agree with all of the above. I just looked at mine and it is set up the same way.

 

Good to know. The reason I am asking is, I was on the phone with superlift(per Brandon's recommendation) to get the 4" blocks and correct U bolts, and the guy needed a measurement on the U bolt. I went out to get it and saw that and thought maybe there were 2 blocks sandwiched in there. Now that you mention that the bottom one is a perch, that makes sense. Thanks all.

 

Aren't the F350 blocks taller than the 250 from the factory?

 

yes they are....i should have looked at his sig...

 

Looks like mine used to.

 

No worries, Ron. Wasn't trying to be a smarty pants or anything.