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Been looking for a bit and can’t find a spring code showing weight capacity of the front spring.
Front springs should be “7” based on my research. It had the Dana 50ttb, f250hd.
Im going to try to order the appropriate lift spring in height and wanted to match spring rates. Maybe this will tone down some of the harshness.
From what I have seen 3850lbs was the dana 44 ttb and 4400lbs or something close to that was the dana 50 ttb.
If you had a extended cab f250 the dana 50ttb would have been standard. The dana 44ttb was standard on a f250 with a regular cab. The dana 50 ttb on a regular cab was special order so not as common.
From what I have seen 3850lbs was the dana 44 ttb and 4400lbs or something close to that was the dana 50 ttb.
If you had a extended cab f250 the dana 50ttb would have been standard. The dana 44ttb was standard on a f250 with a regular cab. The dana 50 ttb on a regular cab was special order so not as common.
it definitely was the 50ttb, regular cab. I’m getting confused on weight per single spring and pairs. Some manufacturers list the 3850 weight, and others go by full capacity. Not a big deal on simple math, but it’s odd to see some rate per and some per pair.
it definitely was the 50ttb, regular cab. I’m getting confused on weight per single spring and pairs. Some manufacturers list the 3850 weight, and others go by full capacity. Not a big deal on simple math, but it’s odd to see some rate per and some per pair.
Possibly the axle was swapped or the cab was swapped? Here is what car-part lists for f250 front axles. There was only two choices the dana 44 or the dana 50. We are talking about the tag number with the front GAWR not the spring capacity. You need to get this straightened out if you are trying to get the correct springs. I would assume the heavier axle would take a higher rated spring. But your tag lists the lighter duty axle.
3800 lb, 1/2" studs, 3.54 ratio
3800 lb, 1/2" studs, 4.09 ratio
3800 lb, 9/16" studs, 3.54 ratio
3800 lb, 9/16" studs, 4.09 ratio
4600 lb, 1/2" studs, 3.54 ratio
4600 lb, 1/2" studs, 4.10 ratio
4600 lb, 9/16" studs, 3.54 ratio
4600 lb, 9/16" studs, 4.10 ratio
Possibly the axle was swapped or the cab was swapped? Here is what car-part lists for f250 front axles. There was only two choices the dana 44 or the dana 50. We are talking about the tag number with the front GAWR not the spring capacity. You need to get this straightened out if you are trying to get the correct springs. I would assume the heavier axle would take a higher rated spring. But your tag lists the lighter duty axle.
3800 lb, 1/2" studs, 3.54 ratio
3800 lb, 1/2" studs, 4.09 ratio
3800 lb, 9/16" studs, 3.54 ratio
3800 lb, 9/16" studs, 4.09 ratio
4600 lb, 1/2" studs, 3.54 ratio
4600 lb, 1/2" studs, 4.10 ratio
4600 lb, 9/16" studs, 3.54 ratio
4600 lb, 9/16" studs, 4.10 ratio
well, regardless it’s gone now, I’ve had the kingpin Dana 60 swapped in now for 10 years. Was just trying to find the original spring rate to make a new spring with positive arch at the same rate. I can get springs made locally and if I give them that information, they can have them made.
well, regardless it’s gone now, I’ve had the kingpin Dana 60 swapped in now for 10 years. Was just trying to find the original spring rate to make a new spring with positive arch at the same rate. I can get springs made locally and if I give them that information, they can have them made.
I missed that fact or you didn't mention it. When you are looking your truck up you are looking for a f350 correct? Your truck is now configured like a f350 with that front axle. The original TTB springs had a higher spring rate than the f350 setup and are reversed arched, just because of the frontend design. If you want a reference of what Ford had under it, make sure to look up a f350 spring that has a positive arch. And it also had a extra thick block in the back underneath the spring since the frontend ended up being a little higher on the f350.
I missed that fact or you didn't mention it. When you are looking your truck up you are looking for a f350 correct? Your truck is now configured like a f350 with that front axle. The original TTB springs had a higher spring rate than the f350 setup and are reversed arched, just because of the frontend design. If you want a reference of what Ford had under it, make sure to look up a f350 spring that has a positive arch. And it also had a extra thick block in the back underneath the spring since the frontend ended up being a little higher on the f350.
ah, good call, so just reference ‘86 f350 with 460 gas?
ah, good call, so just reference ‘86 f350 with 460 gas?
Yes. Technically that is what you have now.
If you think about it, with the ttb and the reverse arched springs, the front shackle works fine. When you hit a bump the spring arches up becoming shorter, and the front shackle moves rearward. It's almost like it was a get r done thing by Ford, mid year 1985 they changed the f350 only back to a solid dana 60 axle instead of the dana 50ttb they were using starting in 1980. They used positive arched springs and put the solid axle under it. Worked ok really, and other manufacturers do put the shackles up front. But it is supposed to ride better if the shackle is in the rear. As the positive arch spring compresses when it hits a bump, it grows longer. So the shackle up front moves forward instead of backward like it did with the ttb. Just a small thing that may make it ride a little better by putting it in the rear.
Yes I agree. That’s why I’m going to take baby steps, first, get the correct spring and rate with the positive arch I need. Then if it’s still bad, relocate the shackle to the rear.
Any chance anyone knows the spring rate on the f-superduty non powerstroke? I saw they have 6 1/4” positive arch, but the spring rates I saw on a few websites seem a little low... I’m not sure if it’s rated as a f-450?
the f-superduty spring rate is 2250 vs stock 2200, so my worst fear is that the spring rate is not much stiffer and the roughness is probably because of the shackle location.
I can either go with one company and get the u code superduty springs and have to get it lifted higher to match the other suspension components I have to match the 5 1/2” lift, or get the sky kit for obs springs, and get the f350 with the 3” positive arch rated at 2200lbs and the extra 2” from the shackle reversal.
I feel like I’d like the ride of the superduty springs, but the extra cost of the shackle reversal, on top of the fact I’d still need to lift it somehow to get the height I need. I think the sky option seems most cost effective and honestly straightforward installation.
Everyone recommends the u code superduty spring, which has a rating of 2030lbs, mine is currently 2250, so is a decrease i rating of 440lb per front the reason the superduty springs ride better? Or is it a cumulative effort between the rear shackle and the decreased rating?
I can get springs cut with the positive arch I need at the 2030lb rating in stock obs spring length, reverse the shackle and not spend the couple hundred more for the actual superduty spring, and the higher cost of the superduty shackle reverse.
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