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Difference between under axle and over axle leaf springs?

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Old 12-21-2011, 08:47 PM   #1
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Difference between under axle and over axle leaf springs?

Sorry if this seems newbish but I was wondering what are the main differences between our 5 lug under axle leafs and the prerunner over axle springs? Is it performance or just for a higher ride?
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Old 12-21-2011, 08:56 PM   #2
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lower ride height, honestly not sure.... although a lot of LT guys like the SUA
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Old 12-21-2011, 08:59 PM   #3
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No difference in the springs themselves. Maybe different rates.
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Old 12-21-2011, 10:43 PM   #5
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Quote:
Originally Posted by whippersnapper02 View Post
No difference in the springs themselves. Maybe different rates.
no. They all have different rates, and the design of the leaf pack themselves are different. 5 lug base and XR are similar, as well as the 6 lug packs, but they differ from each other.

2nd Gen Trucks come with one of four leaf packs.

1. 5 Lug 3 leaf pack (greatest arch)
2. 5 Lug 3 leaf pack (XR Models, De-arched, less capacity, stiffer, less progressive)
3.6 Lug 3 leaf pack (different design than the 5 lug packs, the 2nd leaf extends almost around the front leaf hanger, unhappy overload vs. happy for 5 lug springs)
4. 6 Lug 4 leaf pack TSB& Canadian


6 lug and 5 lug leaf packs do however use the same mounting points so in theory they are interchangeable. 6 lug leaf packs do have less of an arch, so if you use them in a SUA setup on your 5 lug, they will drop the truck. I have this setup.

6 lug leafs are a bit more progressive than the 5 lug leafs, and are stiffer. Speaking from experience.

6 lug leafs on the left, 5 lug leaf on the right. the side facing you in the front of the leaf relative to the truck. notice the difference in the 2nd leaf.
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Old 12-21-2011, 10:45 PM   #6
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Quote:
Originally Posted by hedlesbrmstkbass View Post
no. They all have different rates, and the design of the leaf pack themselves are different. 5 lug base and XR are similar, as well as the 6 lug packs, but they differ from each other.

2nd Gen Trucks come with one of four leaf packs.

1. 5 Lug 3 leaf pack (greatest arch)
2. 5 Lug 3 leaf pack (XR Models, De-arched, less capacity, stiffer, less progressive)
3.6 Lug 3 leaf pack (different design than the 5 lug packs, the 2nd leaf extends almost around the front leaf hanger, unhappy overload vs. happy for 5 lug springs)
4. 6 Lug 4 leaf pack TSB& Canadian


6 lug and 5 lug leaf packs do however use the same mounting points so in theory they are interchangeable. 6 lug leaf packs do have less of an arch, so if you use them in a SUA setup on your 5 lug, they will drop the truck. I have this setup.

6 lug leafs are a bit more progressive than the 5 lug leafs, and are stiffer. Speaking from experience.

6 lug leafs on the left, 5 lug leaf on the right. the side facing you in the front of the leaf relative to the truck. notice the difference in the 2nd leaf.
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Old 12-22-2011, 09:34 AM   #7
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Thank you for all the replies. That makes a little more sense now. As far as the under axles having less axle wrap... What exactly does that mean? I've heard it said a million times but am unsure of what it actually is. Also if it causes less axle wrap why didn't the prerunner go with under axle?
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