extended U Bolts
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
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Junior User
Joined: May 2010
Posts: 62
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From: Tiffin Ohio
are they long enough to hold the 2 blocks together?
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Junior User
Joined: May 2010
Posts: 62
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From: Tiffin Ohio
thank you for your input i appreciate the advice, but even aftermarket lift kits use blocks to lift the rear, so i do not see why this is not right? its better than some of my friends who make lift kits out of wood or whatever scrap they have laying around, plus its a 21 yr old truck i dont want to spend $600+ on a actual lift kit, i got the truck for free soyou can understand where i am coming from..
Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
Get a tape measure and measure your stock u-bolts(length and axle diameter) then add the height of your second block. NAPA, Advanced, Auto Zone and the like all stock u-bolts. You will most likely need the same length ones a F350 uses.
I am not a fan of stacking blocks, try and find 1 block for the total height.
F350 use 4"
F250 use 2.5"
I am not a fan of stacking blocks, try and find 1 block for the total height.
F350 use 4"
F250 use 2.5"
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Elder User
Joined: Sep 2003
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thank you for your input i appreciate the advice, but even aftermarket lift kits use blocks to lift the rear, so i do not see why this is not right? its better than some of my friends who make lift kits out of wood or whatever scrap they have laying around, plus its a 21 yr old truck i dont want to spend $600+ on a actual lift kit, i got the truck for free soyou can understand where i am coming from..
Blocks act like a lever arm when you start them longer and longer. Read up about axle wrap. Well, that effect is magnified the more blocks you put on there. The more blocks you put in, it exponentially increases the amout of stress you put on the spring and the driveline.
So...go ahead man, but the next time you do a hole shot and you break a spring, or blow a u-joint up....dont say i didnt tell you so.
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Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
Actually YOU are wrong. All of the suspension companies out there give you a block to STACK on top of your stock block unless you go with replacement springs or add-a-leaf
Senior User
Joined: Nov 2010
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Anybody will sell you anything as long as people will buy it. Just because you can get one doesn't mean you should use it. Stacked blocks are very dangerous, even if they're only on the back. Just a little bit of stretch in the u-bolts, and that happens, and those blocks can kick out on land you on your lid in a heartbeat. or a barrel roll. or a cartwheel.
At any rate, if your as little a fan as I am of truck gymnastics and breakage, don't do a block stack. Flip the rear shackles. Its much safer, adds articulation, and costs as much as grade 8 bolts.
At any rate, if your as little a fan as I am of truck gymnastics and breakage, don't do a block stack. Flip the rear shackles. Its much safer, adds articulation, and costs as much as grade 8 bolts.
Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
F350 u-bolts are approx 13.5" long
F250 u-bolts are approx 10" long
I dont have a F150 other wise I would give your those measurments
Laughing Gas
Joined: Dec 2007
Posts: 959
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From: Imperial, MO
If you have a farm/tractor supply type store near you, they will typically carry them.
Fleet Owner
Joined: May 2009
Posts: 21,437
Likes: 76
From: Gilbert, PA
Here
Search: u-bolt | Suspension U-Bolt | AutoZone.com
And here
Advance Auto Parts: Search Results for u bolt
And here
https://www.napaonline.com/Catalog/Result.aspx
And here
UBoltsDirect.com - Custom UBolts, Springs, Suspension and Towing Related Products. Toll-Free 1-877-HITCH-IT (448-2448)
And here
Suspension U bolts with nuts and washers for leaf springs, frame, and other Ubolt applications.
Search: u-bolt | Suspension U-Bolt | AutoZone.com
And here
Advance Auto Parts: Search Results for u bolt
And here
https://www.napaonline.com/Catalog/Result.aspx
And here
UBoltsDirect.com - Custom UBolts, Springs, Suspension and Towing Related Products. Toll-Free 1-877-HITCH-IT (448-2448)
And here
Suspension U bolts with nuts and washers for leaf springs, frame, and other Ubolt applications.