Front Coil Springs Table
Does anyone out there know where a comparison table is for front coil spring specs?
I've been looking around trying to find one and all I see out there are charts for the older trucks and not the newer part numbers. It appears that FCA changed the part number / build codes to something different making it harder to figure out what springs are under the truck today and if there are any factory upgrades that I can get easily.
I have a 2012 MC dually with a ranch hand full replacement bumper. It feels like I'm bottoming out when I go over repeated bumps on the highway and the front just feels uneasy. I've already ordered new shocks but the more I look at the truck, the more it seems like the front springs just aren't strong enough to cover the weight.
There are a bunch of aftermarket spring sites, but I don't know if I want 2600lb springs or the 5000lb springs without knowing what I have today.
I have a tag on my current passenger side that has the following numbers on it.
There is this site with the older spring rate breakdown
Dodge Ram 4WD truck front spring specifications
But it doesn't have the newer specs or part numbers listed.
This page has more information about upgrading the size but it still doesn't cover the new springs
Ram springs with heavy winch bumpers
This page has a different part number for the snow plow prep that ends in 986AA - Part number 52113986AA.
But I can't tell if anyone has a chart that would tell me the difference between a 68050568AA and a 52113986AA
It has a bunch of numbers from the 3rd gen part numbers but not the 4th gen part numbers.
My front end is sagging but I don't really want a lift kit. I'd just as soon have a heavier stock length spring because I like the rake in the truck, I just think the rake I have right now is excessive and I don't like the way the front end feels. I had an '07 3500 QCLB SRW and never had the same kind of issue as I have with this '12 MC Dually.
I hope someone out there has some insight. I'd like to get a heavier spring, but I'm stumped at the moment and my dealer is about 3 shades of useless from my current experience with them.
Try having a different dealer run your Vin. They can tell you what came on your truck. A good parts guy can be a great help for this kind of stuff.
So far there are a bunch of options, but I can't see how they correlate to actual spring rates. I did find it interesting that the spring part number on the tag on my passenger side isn't even listed for the 2012 3500 when you search by that model on this particular site. It shows on the list for 2011 2500s though. I don't have a tag on the driver side any longer but I'm starting to wonder if this was an early year model build with leftover parts.
Part Number Name Description
52121622AA Coil Spring RAM 2500, 3500; CODE ZAD, ZND 2011 2500
52122559AA Coil Spring RAM 2500, 3500; CODE ZPA, ZBA 2011 2500
68050553AA Coil Spring RAM 2500, 3500; CODE ZEH, ZTH 2011 2500
68050554AA Coil Spring RAM 2500, 3500; CODE ZEG, ZTG 2011 2500
68050555AA Coil Spring RAM 2500, 3500; CODE ZEF, ZTF 2011 2500
68050556AA Coil Spring RAM 2500, 3500; CODE ZEE, ZTE 2011 2500
68050557AA Coil Spring RAM 2500, 3500; CODE ZED, ZTD 2011 2500
68050562AA Coil Spring RAM 2500, 3500; CODE ZEB, ZTB 2011 2500
68050563AA Coil Spring RAM 2500, 3500; CODE ZNF, ZAF 2011 2500
68050564AA Coil Spring RAM 2500, 3500; CODE ZEA, ZTA 2011 2500
68050565AA Coil Spring RAM 2500, 3500; CODE ZNE, ZAE 2011 2500
68050568AA Coil Spring RAM 2500, 3500; CODE ZNC, ZAC 2011 2500
68050569AA Coil Spring RAM 2500, 3500; CODE ZNB, ZAB 2011 2500
68050570AA Coil Spring RAM 2500, 3500; CODE ZNA, ZAA 2011 2500
68050572AB Coil Spring RAM 3500; CODE ZFK, ZUK 2012 3500 list
68050576AA Coil Spring RAM 3500; CODE ZFG, ZUG 2012 list
68050577AA Coil Spring RAM 3500; CODE ZFH, ZUH 2012 list
68050579AA Coil Spring RAM 3500; CODE ZFF, ZUF 2012 list
68050580AA Coil Spring RAM 3500; CODE ZFE, ZUE 2012 list
68050581AA Coil Spring RAM 2500; CODE ZFD, ZUD 2012 list
68050582AA Coil Spring RAM 2500; CODE ZFC, ZUC 2012 list
68050584AA Coil Spring RAM 2500; CODE ZFA, ZUA 2012 list
68068585AA Coil Spring RAM 3500; CODE ZFB, ZUB 2012 list
The Perfect Mopar Part For Your Vehicle - SUSPENSION COMPONENTS for 2012 Ram 3500
Take the truck and get it weighed. Ideally each tire individually but most places can't do that so just look at front and rear axle and divide by 2. Then you have most of the information you need to design your own coil. Free height of the coil you can get from your current ones, then if you measure delta from ride height to free height you can figure out your stock coil rate. Then to get to what coil rate you want next is to raise the truck to the height you want it and see what the delta is from free height. Call up coil spring specialties on the east coast and say build me coils with these specs.
That answers what you want ... however ... once you have the weight on the front axle I might give Aaron a call over at Thuren. Reason is this ... thuren coils are softer yes but have a larger free height. So you might end up with the same result ride height at the end of the day with Thuren coils but have a much softer coil rate and thereby giving you a better ride. Stiffer coils is not the direction I would be trying to go personally.
Thanks for the info tgibbs. I bought this truck to eventually set it up with a truck camper and tow a trailer so that is why I'm looking for a bit more capacity than what it has today regarding the stiffer spring. It is bottoming out unloaded so I'm not sure what it will do if I actually load it down.
I'm not opposed to a custom spring but I need more information before I'm ready to make that jump. I will look at Thuren and the other major manufactures before jumping.
Thanks again guys,
Rhinopkc - I sent an email to the Dodge customer support group and they sent me my build sheet last night. It still doesn't answer my questions but at least I have this info now.
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When is it bottoming out? You just have a big front bumper on the truck? 3500 so you have leafs in the back so you are talking about front coils right? I'm just surprised as your not the only one that has a big bumper and tows trailers so maybe the bottoming is at a point where he suspension is doing what it's supposed to be doing.
It bottoms out quite frequently. It does it when I cross over the sidewalk into my son's daycare each day, it bottoms out when it starts an oscillation cycle going down highway 49 in louisiana where the expansion joints cause an up and down rocking and it hits the bump stops (this can go on for a while unless you adjust speed or ). It bottoms out on rough bridge transitions here in Dallas.
All of this is when it is unloaded and not towing a trailer. I'm sure if I had a load in the bed it wouldn't be quite as bad and would probably take some weight off the front.
Completely unloaded, including absent of tools since I just got it back from the dealership again, I crawled under it last night and I only have 1.5" - 1.75" of free space between the front axle and the front factory bump stop and that is after I installed the Bilstein 5100s yesterday. I'm sure there was less when it settled with the stock shocks. The factory passenger shock was starting to weep some oil at 34,000 miles.
I didn't get a chance to measure sag last night, I didn't have enough time after putting the front end back together. I had a unit bearing go bad on the drivers side so it has been on jack stands for a few days while I sourced all the tools and parts.
I'm pretty confident that it is under sprung or at least sprung for ride and not for loading heavy. This isn't my first ram 3500 and this one is the 9th one my close family but it is the first one that rides like this. That is why I am trying to get details on the springs from the factory. They did it for the 2nd gen part numbers, it just hasn't been done for the 4th gen yet.
I'm pretty confident after what I measured last night I'm going to get springs pretty soon. I just don't know if I'm going to go heavier stock height or go with a more standard 2" leveling spring to pick the front end back up. I will have airbags on the rear when I get ready to haul heavy again but right now they aren't necessary.
Wow that's sagged really bad.
Hooking a gooseneck up is going to increase weight on the front axle actually.
It sounds like those coils are beyond toast to the point I wouldn't use those as a data point for building new springs off of. Sounds like a bad coil or one with tons of miles and are just flat worn out. I don't know about your area but around here people just give the stock coils away. I would try new stockers prior to building your own. Just to make sure you get what you want on the first try.
The stiffness of the coil doesn't dictate it's life cycles
Yeah. It is a pretty extreme example and I'm just not sure why. That is why I was trying to get some data on the stock part numbers to see if I could get some that were a bit stronger in the stock range like the cab and chassis springs to counter the bumper and still be better than say a 2500 coil.
I've only had the truck about 6 weeks and bought it used like it sits. I'm just trying to fix a few shortfalls like this one. It is a big one though that can be fixed for not a lot of money.
Thanks for the help.
Good luck! I would definitely hit up Aaron at thuren once you weigh the front axle, he's a good dude and will tell you straight up if what they have will work or not
Can you measure like this:
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