This may seem like a really dumb question, as I've never had to source parts or do any work on suspension systems-- but what I ultimately want to do-- is to improve payload capacity in my 2011 XL 4cyl by a few hundred pounds. In lieu of sourcing aftermarket / performance parts or lift kits, what have you, is it possible that because the 6cyl Rangers came with an extra leaf in the rear springs (and maybe beefier front coils?), I can source those OEM and have them swapped into my 4cyl?

Would there be issues with spacing? I don't want to drastically alter the factory geometry, and I don't really care about lifting the vehicle for optics. This is a city work truck and my ultimate goal is to increase payload capacity and ride stability, without buying performance parts that could later prove to be difficult to replace or swap back for stock.

Any thoughts?

 

Don't have an answer for you, but interested in hearing any solutions out there.
Good looking basic\clean\white work truck.

 

Welcome to the forum

Rear leaf springs were not based on engine size, all Rangers were rated as 1/2 ton, 1,000lbs, trailer package option could change spring type
You should look at the label on the back of drivers door and get the Spring Codes, for Front and Rear

Example here: https://www.ranger-forums.com/attach...e-101_0002.jpg

Bottom right you see SPR
Below that 3333
Front springs are 3 and 3
Rear springs are 3 and 3
In that order

Google: ford ranger spring codes

As for extra weight in the bed, the rear axle is rated for 2,750lbs
A 2011 regular cab Ranger 2.3l weighs about 3,200lbs
If we do a weight ratio split of 70/30, 30% at the rear, the rear axle has 960lbs sitting on it with empty bed
If 1,000lbs(1/2 ton) is added that's 1,960lbs on rear axle, but some of that would go to front springs, not alot but some
You could add overload/helper leafs to the rear to add more capacity, but its not really more capacity, lol, it just doesn't squat down as much in the rear with the extra weight added
The max capacity is set by Axle Rating(2,750lbs), so I wouldn't go over 2,400lbs or a hard "bump" in the road could break an axle

You could put on higher rated Ranger leaf springs but the truck could ride rough if weight was less in the rear, that's why overload leafs are used instead, same ride empty or fully loaded

Front coils wouldn't help much unless you think yours are failing
2.3l engine dressed weighs about 300lbs
4.0l sohc dressed weighs about 450lbs
So difference is about 150lbs, so adult passenger in the cab

The picture looks like its sitting level now, so changing front springs may raise the front a bit, so rear would be lower, and ride would be harsher in the front if its "over sprung"

Suspension springs are matched to the weight they support, when you hit a bump the weight of the vehicle holds the top of the spring from moving up, so the bottom of the spring goes up to absorb the bump and does not pass too much of that movement to the vehicle(body and frame)
If you increase the weight rating of that spring then it will push the vehicle up more, instead of absorbing the bump, which gives a harsher ride as you "feel" every bump in the road
The point of spring suspension is so it can absorb bumps, so the spring must be matched to vehicles weight on each wheel

And that's the point of Overload springs on pickups, they are more expensive than higher weight rated springs, so usually not a factory option, lol
So regular leafs are rated for bed weight empty and maybe an extra 500-600lbs, over that and the bed starts to squat down
The Overload springs don't touch the other springs until weigh is over 500lbs, at that time they can support the extra weight so rear doesn't squat and ride doesn't change much empty or full
So in my opinion overload springs would be a better option than higher weight rated factory springs

 

Hey there! Thanks so much for the detailed response, it's starting to make sense now haha. I will do some due dilligence on overload springs now.

-L

 

Also* just to clarify the 'overload springs' are the same as what are sold as 'helper springs' correct?

 

Is there any way to strengthen the rear axle like welding in braces or webbing?

 

Yes, helper springs are overload springs

No, the axle rating is what it is, there is no way to increase it
You could look at changing to an Explorer 8.8" rear axle, 3,200lbs, same width and lug nut pattern as Rangers, even has disc brakes like your 2011 has
But does involve some cutting and welding

Swap seen here: https://www.therangerstation.com/tec...lorer8_8.shtml