I'm ruckus 13 I have a 92 ranger xlt with 4.0 and 4in rough country lift and f150 rear leaf spring swap I'm having issues with the front end not flexing also I'm running 33 12.50 15 I could really use some advice on what to do to get it to flex

 

Welcome to the forum

Remove shocks and see if flex is better, someone may have put 'stiff' shocks on it.
Shock don't support any vehicle weight, in 1992 the coil springs support the front end weight
Shocks are there to stop springs from continuing to bounce after hitting a bump.
Shocks have an oil inside and small holes with valves, when compressed the oil is forced thru the holes absorbing some of the energy then slows rebound a bit to stop continued bouncing.

Your Ranger will have a front axle weight, and the shocks used need to be for that weight.
If front of vehicle weighs, 1,800lbs, and you put shocks on for 2,500lbs vehicle then shock will prevent springs from flexing enough, not enough weight to collapse them.
So to stiff

And you can have too much spring, same thing as above, weight of front end needs to be part of what spring you use.

Think of rear springs of any pickup truck, if you put on springs to handle a 2,000lbs load then drive around with only 500lbs load it will be stiff, which is why over load springs are better, you get good ride with 500lbs and when loaded the overloads touch the frame so good ride with full load.

Front end weight doesn't change, well unless you swap in a BT4, lol, 800lbs of engine

All comes down you what YOU want, your use for the vehicle

 

The lift I put one came with new springs , shocks, and drop brackets. The rear will flex great but the front stays flat across. I checked the shocks the compress good

 

And the front?

When you push down on one side in the front does it move like the back with the same weight applied?

Or do you have to "jump on it" to get it to move?
If so you have way to much spring for the weight of the front
This is not about the length of the spring, it's the spring rating of the spring

Spring rating is the amount of force it takes to compress the spring 1"

Load rate is NOT the same, its the amount of weight spring can carry at a specific height, i.e. "ride height"

You want a lower spring rate for more flex
400lb is stock spring rating for ranger 4x4, I think

Your current springs are probably 500+lbs, very stiff

If Rough Country doesn't list spring rates, you can call them

Or you can calculate what they are yourself, read here: Coil Spring Rate Calculator

 

They rate it at 425. Where is a good place to order softer springs. Rough country doesn't offer anything softer than that. Or is there a way of making mine softer.

 

Did you test flex with shocks removed, you just need to take one end of shock off so it won't effect spring deflection, no need to drive it that way.

I would double check "their" spring rating using the calculator in above post
Bottom of the page, just need 3 items from that coil spring
The diameter of the metal wire used to make the coil
The diameter of the coil itself, from center of wire to opposite center
Number of active coils on the spring

If you plug in
.5(1/2 inch) diameter metal wire
3 inch diameter coil
8 active coils
Result is 407 spring rate

If coil diameter is changed to 3.25 then rate drops to 320
If coil diameter is changed to 2.75 then rate jumps up to 528

Be a shame to get softer coils only to find out they are not that much softer

So find out exactly what you have now, and go from there.


There are also Variable spring rate coils, the rate increases as they defect more, so smoother ride on level ground but increased stiffness with hard turns or larger "bumps"

Image here: http://www.armoredworks.com/metalclo...NG-TYPES-1.jpg