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I have a 2005 F-150 that I’m swapping in a Sterling 10.50” from an ‘07 Super Duty in the rear.

What leaf springs do y’all use for y’all’s swaps?

I don’t want to use the SuperDuty springs, too stiff. But the F-150 springs have 2 center bolts, while the Sterling only has a 1 hole for accept 1 center bolt. I don’t think I can drill a new hole through all the springs packs make it work.

Besides getting custom springs made from Deaver/Atlas/etc, what other option do I have?

Specs I need are 3” wide springs, 55” eye to eye, 11” arch to give me about 6” lift over stock.
 

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Yeah, Superduty springs will be stiff since they are designed to carry heavy loads. There is a company called Sulastic that makes special shackles for truck leaf springs that tames the ride quality. With those you could use the HD springs but the ride would feel very soft. I have a set on my F250 that have been on there for over 20 years and they haven't failed. When I installed those the ride quality was as different as day and night. They are not all that cheap though. Around $400 + shipping.
 

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Yeah, Superduty springs will be stiff since they are designed to carry heavy loads. There is a company called Sulastic that makes special shackles for truck leaf springs that tames the ride quality. With those you could use the HD springs but the ride would feel very soft. I have a set on my F250 that have been on there for over 20 years and they haven't failed. When I installed those the ride quality was as different as day and night. They are not all that cheap though. Around $400 + shipping.
How did the spring project go ? I suspect by now it is all said & done, how is the ride? When l was re-springing my Toyota Land Cruiser, I was told not to go more than a 2” lift over stock, if l wanted more lift go spring over axle & for more lift, block under the spring,& install longer shackles ! More than 2” lift over stock , the spring has to much curve, for smooth good ride.
 

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edit - I can't read.
 

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I realize l should have pushed the reply button of texastruck , instead of for Char , but I can’t remove it , & as far as the - (edit - i can’t read) - this one really has me confused?
I misread the question and answered something completely useless to the conversation. Couldn't see how to delete it entirely.
 
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