stacking rear blocks
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Junior User
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From: marstons mills
stacking rear blocks
I got my 6" lift on my 04' f-350 and superlift sent me a 5" rear block. Well the stock one is 4" and the rear of my truck needs to go up 3" to were i want it to be level.
Anyways i called superlift up and they said that you add the 5" block to your stock one. I said, so now if i do that im going to be 2-2.5" higher in the back which i dont want.
But anyways that = a total of 9" of a rear block. This isnt right im missing somthing but everywere i called they comfermed what superlift said.
But i thought you cant stack blocks?
And if you can for some reason could i get a factory/aftermarket 2" block and stack my 5" on top so i have the right hight????
im very confused help.
Thanks,mike
Anyways i called superlift up and they said that you add the 5" block to your stock one. I said, so now if i do that im going to be 2-2.5" higher in the back which i dont want.
But anyways that = a total of 9" of a rear block. This isnt right im missing somthing but everywere i called they comfermed what superlift said.
But i thought you cant stack blocks?
And if you can for some reason could i get a factory/aftermarket 2" block and stack my 5" on top so i have the right hight????
im very confused help.
Thanks,mike
Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
yeah, it is possible to get 7'' of rear lift. throw out the F-350 block, and get a F-250 block. the only difference on the suspension on the two models is that the F-250 rear block is 2'' and the 350 is 4''. go to a local junkyard and look for them, or if you want to do it, go buy new from the dealership. i would weld them together, and weld a plate on to the sides to strengthen them if it doesnt interfere with assembly. good luck.
Lead Driver
Joined: Jul 2005
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From: Eccles, WV
Guys, not to sound like a pain, but I would not install a block over four inches. You will have too much spring wrap and possibly break the main leafs. I suggest that if you are wanting this high of a lift, to get the spring hangers changed and have a spring shop bend your spring pack to get the height that you want. You can also get an add a leaf package to do the same. I am suprised that Superlift did not make this suggestion to get an additional sale
As a Vehicle inspector for West Virginia, if a vehicle was brought to me with nine inches of block, it would be an immediate fail due to safety.
As a Vehicle inspector for West Virginia, if a vehicle was brought to me with nine inches of block, it would be an immediate fail due to safety.
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From: marstons mills
my only ? is that it is ok to stack them ive olways heard oposite???
I would like a rear block that is a total of 7" ( so 2"stock+5" aftermarket.
Im sayind that my truck is an f-350 it has an 4" block.
The lift manufacturers sell an 5 or 6" block 5" (i guess for f-350)
This aftermarket block is suposed to be used on top of the stocker????
I think a total 9" block is totally rediculouse. but is there people out there that this is common.
I know people stack blocks.
But is it right???? I dont want to hack it
I would like a rear block that is a total of 7" ( so 2"stock+5" aftermarket.
Im sayind that my truck is an f-350 it has an 4" block.
The lift manufacturers sell an 5 or 6" block 5" (i guess for f-350)
This aftermarket block is suposed to be used on top of the stocker????
I think a total 9" block is totally rediculouse. but is there people out there that this is common.
I know people stack blocks.
But is it right???? I dont want to hack it
Postmaster
Joined: Jun 2004
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From: Milky Way Galaxy
My opinion is that stacking a 4" block on top of a 5" block would be a bad idea. These are big heavy trucks, with big heavy axles. The amount of lateral force that would be put on the seem where the blocks come together if you were to have to jerk the truck, say in an emergency manuever might cause blocks that size to seperate. And you can guess the outcome of that. This is what Strokin_7.3 had alluded to when he mentioned getting the blocks permanently bonded together.
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From: marstons mills
the problem im having is are you guys talking about adding the 4-5" blocks to the factory blocks.
I just cant belive the superlift said its perfectly fine to stack there block on top of the factory.
I dont mind putting ladderbars on.
I just cant belive the superlift said its perfectly fine to stack there block on top of the factory.
I dont mind putting ladderbars on.
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Postmaster
Joined: Jun 2004
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From: Milky Way Galaxy
It does seem a little odd that Superlift would say to stack the 5" block that comes in the kit with the stock 4" block. Or maybe they weren't understanding that your stock block was a 4"er. Maybe they thought it was a 2" block. Either way I still don't think stacking blocks of any size is a good idea. I would call them back and talk to someone else. It seems like you should have gotten blocks and add-a-leafs.
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Postmaster
Joined: Jan 2005
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From: Phenix City, AL
DO NOT STACK THE BLOCKS. As mentioned above, too much axle wrap and lateral force. Not to mention that eventually you will spit one of those blocks out.
Go to a suspension shop or a custom spring shop and have them cut you a set of blocks to length. Then you can get the correct angle on them too and don't have to add shims to get your u-joint angles right and avoid the vibration. They will also be able to cut you the right size u-bolts while they are at it. Shouldn't run you too much, this is a pretty cheap deal. Or, call Superlift and tell them to send you the right junk.
Go to a suspension shop or a custom spring shop and have them cut you a set of blocks to length. Then you can get the correct angle on them too and don't have to add shims to get your u-joint angles right and avoid the vibration. They will also be able to cut you the right size u-bolts while they are at it. Shouldn't run you too much, this is a pretty cheap deal. Or, call Superlift and tell them to send you the right junk.
FTE Leadership Emeritus
Joined: Jul 2002
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From: Long Island USA
Anything past 4" is a no-no... I've learned that here on this site 
And my own experiences with axle-wrap with the highboy... If you go past 4" blocks, traction bars are in order...
And anytime you mess leaf springs, use NEW u-bolts....
And my own experiences with axle-wrap with the highboy... If you go past 4" blocks, traction bars are in order...And anytime you mess leaf springs, use NEW u-bolts....
Posting Guru
Joined: Aug 2001
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I agree with the others don't stack blocks to increase the height. You have to think about it the only things holding your axle from shifting foward etc is the little head on the center bolt and the nub on the bottom block. When you have that much leverage something has to give and the blocks spit out the axle twists and you cause a accident.
Freshman User
Joined: Aug 2004
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Hey Brainchild, if you want some 2 inch blocks call me and you can have mine for just the shipping, 517-445-2154. I just replaced mine this weekend with the 4 inch blocks and don't have any use for the old ones. Also just a FYI, there is a big warehouse of stuff for Superduty trucks a couple of miles from my house near Hudson, MI. The stuff is mostly brand new or low mileage because they buy there stuff straight from Ford. They have everything from tires and rims to rear ends, engines and body parts. They even build trucks from the parts they have. I don't know if I'm allowed to say it or not but the company is called Sexton and Son. That's were I got my 4 inch blocks for $20.
FTE Leadership Emeritus
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From: Long Island USA
Originally Posted by Kenworth
I agree with the others don't stack blocks to increase the height. You have to think about it the only things holding your axle from shifting foward etc is the little head on the center bolt and the nub on the bottom block. When you have that much leverage something has to give and the blocks spit out the axle twists and you cause a accident.
That center bolt is just to line it up during assembly.
But yeah, multiple blocks is a bad idea, too much leverage against the u-bolts...
