question
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Senior User
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question
I asked about this on another thread but I'll ask it here as well
I just bought a 99 F-350 crew cab 4x4 w/ the 7.3 psd. It has "D" rated (8 ply) tires and the max press. on the tire is only 55 psi. I am getting a lot of tire nose (Cupping). I will be towing a 10,000 lb fithwheel.
1. Should'nt this truck have "E" rated (10 ply) tires capable of holding more press?
2. Can I put the "D" rated tires on my 01 F-250 super cab 4x4 with a 5.4 ?
My 01 5.4 came with "E" rated, I am sure the 350 came with E,s but It has brand new D,s on it. The 250 needs tires and I would rather have E,s on the 350 with the PSD. I hate to buy 8 new tires. With the 250 having the 5.4 and not towing would the D,s be safe?
Thanks
I just bought a 99 F-350 crew cab 4x4 w/ the 7.3 psd. It has "D" rated (8 ply) tires and the max press. on the tire is only 55 psi. I am getting a lot of tire nose (Cupping). I will be towing a 10,000 lb fithwheel.
1. Should'nt this truck have "E" rated (10 ply) tires capable of holding more press?
2. Can I put the "D" rated tires on my 01 F-250 super cab 4x4 with a 5.4 ?
My 01 5.4 came with "E" rated, I am sure the 350 came with E,s but It has brand new D,s on it. The 250 needs tires and I would rather have E,s on the 350 with the PSD. I hate to buy 8 new tires. With the 250 having the 5.4 and not towing would the D,s be safe?
Thanks
Lead Driver
Joined: Jan 2005
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From: Huntington Indiana
First you'll have to find out if the rims are capable of the extra load and pressure of the "E" tires. Cupping can be many factors including front end alignment.
You can see what tires was on it by looking on the door tag on the drivers door jamb. I checked with trailer life magazine and you'll be Ok for weight but don't add too much stuff.
If the tires will swap (same rim size - example 16" on both ) then you should be Ok. Probably will have to take the tires to a tire shop and have rims changed.
But if the tires are cupping are they worth swapping?
You can see what tires was on it by looking on the door tag on the drivers door jamb. I checked with trailer life magazine and you'll be Ok for weight but don't add too much stuff.
If the tires will swap (same rim size - example 16" on both ) then you should be Ok. Probably will have to take the tires to a tire shop and have rims changed.
But if the tires are cupping are they worth swapping?
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Thanks medhvac. I was talking with you the other week on a black 99 F-350. I bought it and the D rated tires are the only thing I do not like. You can tell they bulge under the weight of the PSD
bigredtruckmi I think they are cupping because of the weight. the max press is 55 psi and load is only 3000 lbs. I want something that will take 80 psi. I think under lighter weight on my 250 they may round out. I am going to have the alignment checked. Thanks
bigredtruckmi I think they are cupping because of the weight. the max press is 55 psi and load is only 3000 lbs. I want something that will take 80 psi. I think under lighter weight on my 250 they may round out. I am going to have the alignment checked. Thanks
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Joined: Nov 2002
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From: Texas
I think back in early years of SDs, they came with D rated tires if you did not get the camper package or towing. At 55psi and 3000 lbs, that is 6000 on back axle--should be enough tire to be ok. Overloaded tires usually wear on the edges, so maybe you do need the E rating and 80 psi. My D tires on a trailer are rated at 3045 lbs @ 65psi.
