DO "U" Code SD Springs Provide Lift

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Jan 21, 2016 | 12:36 PM

Areyouliving

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Joined: Oct 2013

Posts: 44

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DO "U" Code SD Springs Provide Lift

I'm ordering my PMF RSK and I need to order shocks as well. I am getting the smallest lift RSK (2.25 I think) and I plan to run the U code SD springs since I have a 460 in my truck. If those springs add lift then I need to potentially go up to the next length of shock. And besides the adjustable track bar, is there anything else I should consider adding to my list?
I appreciate any insight here.

Jan 22, 2016 | 07:45 PM

Diesel_Brad

Fleet Owner

Joined: May 2009

Posts: 21,437

Likes: 76

From: Gilbert, PA

Quote:

Originally Posted by Areyouliving

Lift over what?

the PMF kit was designed to use SD length spring, not necessarily for a specific rate. the 2.25" is the drop of the spring mounting points

Plan on using longer than stock shocks no matter what SD spring you are using.

What size tires are you planning on going with?

Jan 23, 2016 | 10:48 AM

BiGGreen350

Posting Guru

Joined: Jul 2012

Posts: 1,394

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From: cincinnati ohio

heres my 97 f350 460 zf5

pmf 2.25 with u codes in front

c codes in rear with 5 inch superduty readylift block.

on 315/75/r16

Jan 23, 2016 | 11:23 AM

Bird-Dog 250

Elder User

Joined: Sep 2015

Posts: 562

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From: Otto, NC

I really like the way it sits. I'd like to get my front up. Not quite sure how to do it without sacrificing the ride I've already got with adding a leaf. There must be a taller spring that has a same as stock ride.

Jan 23, 2016 | 02:18 PM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,789

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From: Kentucky

RSK kit with Super Duty springs will dramatically change the ride for the better. Brad has made that statement many times.

Jan 23, 2016 | 02:53 PM

Nothing Special

Lead Driver

Joined: Feb 2013

Posts: 5,006

Likes: 72

From: Roseville, MN

Quote:

Originally Posted by Bird-Dog 250

If your F-250 still has the TTB, just swapping a solid axle in will lift it about 2 - 3" (you need to switch to F-350 springs with the solid axle, F-250 springs are stiffer than F-350 springs due to the TTB giving the tires leverage against the springs). A solid axle swap and a reverse shackle kit will raise it about 5".

If you want to keep the TTB and lift it you probably need to get a lift kit. Only springs without swing arm drop brackets will screw up your steering geometry.