Even when you go to the dealership parts department, they go by vin and door codes. Some of the springs have the weight listed on the parts department computer while others do not. When I ordered my 6k springs, the site showed them as a 6000 spring and even the parts guy said that was unusual to see the actual weight rating given. If they don't show the weight, you basically have to find a similar truck and pull the spring codes off of that vehicle and then order the same ones for your truck. Looking over several threads going back some time, it would appear as though spring codes change often enough that they don't keep a running list of codes.

4wd6.7L - Where are located in CA? I have a set of 5600 springs sitting in a box in the garage

 

Thank you. I'm using Lakeland Ford parts list for the 5C3Z5310CA 6k front spring. They have the spring weights listed for each spring but it doesn't match the engineering code that's on our springs above.

6k spring

 

That is the same 6k spring I put in mine. I did spend a bit of time and painted mine as they looked like they just toss them around in the parts department and are delivered loose and not in a box. Not an issue for most but I hate getting something new and it’s scratched up with white and yellow paint scuffs on a black coil.

 

This is why, I used an actual Diesel with snow plow springs and dual batteries to verify the part number for the 6000 pound springs. The door also had a GAWR of 5990. Go figure, The tags on the springs when our trucks arrive are coded sometimes with the part number and also with a bin number for the assembly plant. Also, be aware that starting in 20-21 things change with the stock ride heights with the super duty platform dependent on packages selected, but see you have a 19.

99% sure you have the 5200 based upon your door tag, and yes the part numbers you listed for 6000 are correct, just ordered and placed mine on this week.

 

interesting, mine looked like they came right off the manufacturing line. Yours come from Detroit? But made in Mexico? That is what my tag said.

 

I worked with Felipe; they didnt have a truck with spec I wanted on the lot but I was able put my name on one of the trucks they had inbound that was almost a perfect match; all in I spent about 15 mins getting to a price I was happy with. I was nervous given all the threads on trucks getting built and then delayed waiting on chips, but he called or emailed at least once a week to keep me updated on where the truck was in the process and then sent me pics the second they picked it up at the rail yard. The whole experience was great from start to finish; they went above and beyond to make everything smooth and painless. I am very happy I gave them my business.

I'm going to get the bumper on and then see how it sits/rides before deciding on which coils to order. Earlier in the thread someone noted that the Legend adds about 250-300lbs net of removing the factory bumper/prius catchers, so the 5600lbs coils should technically be perfect to get me back to a little heavier spring than stock. I will run a winch (Warn 9.5 XP-S), but it'll be on one of those removable cradles, so not on the truck all the time. I think the combined weight of the cradle and winch is right at 100lbs give or take (synthetic line saves a lot). If the 5600lbs arent enough a new pair of 6000lbs isnt that much extra cost.

 

Mine were made in Mexico but my local dealer had them sent over from another dealer near Ontario CA.

 

Lets get to the roof of this,whet is driving your need for 6k springs?

That is a BIG jump and will have a significant impact your ride.

I run the 6k springs and its not a smooth ride, but I need them and it works for me. Unless you need them I would go with the 5600 springs

 

Seems to me none of these trucks really has a smooth ride... My 2012 gas with 4800 springs rides pretty rough until I load it up. I changed my order to get "one step up" springs from the factory. Since the order is gas again I suspect that will give me 5600 lb springs, the 5990/6000 seem to be the heavy springs for the diesels. With the 900+ lbs of plow hanging off the front I know I will appreciate the decision. Sounds like those that have gone up have not seen substantial degradation of the ride. I also think it can be mitigated some by choosing premium shocks.

 

My front end just feels "light" when I go over speed bumps and pot holes. I have Rancho adjustable shocks and it just seems that the weakest part is the springs. I had a 17 with the plow option and it was stiff but solid feeling. I considered the 5600# but I don't want to buy twice.

 

This is why I can't hang around here...paint my springs? Yes, I will have them powder coated, thank you. More money to the "pit".

 

You might want to research powder coating your springs. Sometimes the heat involved alters the temper in the steel. Sometimes you weaken the product you are powder coating. I am not sure if springs would be affected.

 

If you have had that snowplow option then you mostly likely had the 1 up 6k springs and they very stiff, works well on my F 450 but I am putting over 5000 lbs on the steer wheels as per CAT scale. If you have 5200 now do you really want to make that big of a jump???

 

So I am a complete nerd but I decided to build out a matrix of all the options we've been discussing based on that spring rate chart someone posted higher up in the thread. Overall, it seems to track with the results some people are reporting.

I want to caveat, this includes a lot of assumptions, it would almost certainly be more accurate if I pulled my actual coils off and measured the true loaded/unloaded heights to get the actual "weight on front axle", but using the spec'ed loaded/unloaded lengths from Ford gets us close.

In my case I assumed the following:
Unloaded length of 5200lbs coil = 20"
Loaded length of 5200lbs coil = 14.7" (from the chart)
Total drop = 5.3" (20 - 14.7)
Estimated weight: 5.3 * (430lbs/in * 2 coils) = 4558
Ranch hand Legend = 350lbs (someone posted here or elsewhere that it adds this much net of the factory bumper)
Rough country coils (I reached out to their tech support directly): unloaded length of 20 11/16" (used 21 for ease of math) and 495lbs/inch deflection

So with all that in mind, if we hold weight constant and change the deflection rates, you should see an increase in ride height; conversely if you add weight and keep deflection constant then you see a decrease in compressed length.

ETA: I ordered a pair of the Rough Country coils, it'll be a while before I get them on the truck, but I will update/report back what the final results were (I'm expecting ~0.5-1.0" more than the table below since I have a '21 and the spring lengths/rates are for the 17-19 trucks which were taller according to people who've actually measured them).

All of these assumptions yield the following, thoughts?

 

Tex Hunter: This is the real data we need (with an additional column for part numbers).

2019 F350 with 60 gal fuel tank (420 lbs), cap, and bed slide. I replaced the 5200lbs springs with the 6000lbs springs (5C3Z-5310-CA) and gained about 1/2" in height but...the steering is MUCH better. The front doesn't dive when breaking, it's solid over speed bumps, and left-to-right steering feels smoother (the fenders don't lean into the turn). I recommend this change, especially if you have the heavier fuel tank installed. I ordered the springs from Ford Parts Giant. They came in two shipments with just a shipping label attached. The part numbers were the same as were the code stickers but the codes were different colors. I have no idea what that means.