2004 f250 5.4 single cab long bed tire pressure?
02-14-2021, 11:45 AM
#1
Senior Member
Thread Starter
2004 f250 5.4 single cab long bed tire pressure?
Can someone please help me out. I have an 04 f250 5.4 single cab long bed with lt235/85r16 tires. What pressure should I be running in them? They are brand new and i want the best wear i can get.
02-14-2021, 01:57 PM
#2
Senior Member
You can use the Load & Inflation Table Application Guide to determine your recommended/needed PSI based on the weigh carried by the axle and your tire size.
In the case of your truck, check the tag in the driver door jamb for the FAWR and RAWR. Those numbers are the max allowable load for each axle. Divide those numbers by 2 and get the needed tire weight rating and then use the chart to find the PSI.
Example: If the front axle has a FAWR of 4400, divide it by 2 and look for your tire size. The chart says that for the tire to safely carry 2200 lbs, it needs to be inflated to 50 psi. If the RAWR is 5500 lbs, the rear tires need to be set to 70 psi.
Now, if you mainly run around empty, it's worth filling up the fuel tank and taking your truck over a scale one axle at a time. The front will stay pretty constant because the engine is always there and carried mainly by the front axle. If your front axle has a FAWR of 4400 but the actual weight is 3800, I'd shoot for inflating to accommodate 4000lbs on that axle. The rear axle is where it can be extremely light or loaded. If the rear axle has a RAWR of 5500 but empty it only weighs 3500, I would maybe shoot for 3800 (to give a little buffer) and adjust your tires accordingling. In this example, if both axles carried 3800lbs of an empty truck, you could set your tire pressure at about 42 psi on all 4 tires. This would allow the truck to ride very comfortably, give even tire wear and likely produce better braking and handling. When you go to load the rear, inflate to the higher to carry the load and deflate for everyday, empty driving.
In my case, the '16 F250 crewcab 4wd calls for 65psi on all 4 corners. I changed tires from 275/70/18 to 295/60/20 and the new tires actually carry more load at 65 psi. For best ride and still allowing 5000 lbs capacity on each axle, I lowered them down to about 52 psi. The truck rides and handles great and can still carry the maximum load.
In the case of your truck, check the tag in the driver door jamb for the FAWR and RAWR. Those numbers are the max allowable load for each axle. Divide those numbers by 2 and get the needed tire weight rating and then use the chart to find the PSI.
Example: If the front axle has a FAWR of 4400, divide it by 2 and look for your tire size. The chart says that for the tire to safely carry 2200 lbs, it needs to be inflated to 50 psi. If the RAWR is 5500 lbs, the rear tires need to be set to 70 psi.
Now, if you mainly run around empty, it's worth filling up the fuel tank and taking your truck over a scale one axle at a time. The front will stay pretty constant because the engine is always there and carried mainly by the front axle. If your front axle has a FAWR of 4400 but the actual weight is 3800, I'd shoot for inflating to accommodate 4000lbs on that axle. The rear axle is where it can be extremely light or loaded. If the rear axle has a RAWR of 5500 but empty it only weighs 3500, I would maybe shoot for 3800 (to give a little buffer) and adjust your tires accordingling. In this example, if both axles carried 3800lbs of an empty truck, you could set your tire pressure at about 42 psi on all 4 tires. This would allow the truck to ride very comfortably, give even tire wear and likely produce better braking and handling. When you go to load the rear, inflate to the higher to carry the load and deflate for everyday, empty driving.
In my case, the '16 F250 crewcab 4wd calls for 65psi on all 4 corners. I changed tires from 275/70/18 to 295/60/20 and the new tires actually carry more load at 65 psi. For best ride and still allowing 5000 lbs capacity on each axle, I lowered them down to about 52 psi. The truck rides and handles great and can still carry the maximum load.
02-14-2021, 04:23 PM
#3
Senior Member
Thread Starter
You can use the Load & Inflation Table Application Guide to determine your recommended/needed PSI based on the weigh carried by the axle and your tire size.
In the case of your truck, check the tag in the driver door jamb for the FAWR and RAWR. Those numbers are the max allowable load for each axle. Divide those numbers by 2 and get the needed tire weight rating and then use the chart to find the PSI.
Example: If the front axle has a FAWR of 4400, divide it by 2 and look for your tire size. The chart says that for the tire to safely carry 2200 lbs, it needs to be inflated to 50 psi. If the RAWR is 5500 lbs, the rear tires need to be set to 70 psi.
Now, if you mainly run around empty, it's worth filling up the fuel tank and taking your truck over a scale one axle at a time. The front will stay pretty constant because the engine is always there and carried mainly by the front axle. If your front axle has a FAWR of 4400 but the actual weight is 3800, I'd shoot for inflating to accommodate 4000lbs on that axle. The rear axle is where it can be extremely light or loaded. If the rear axle has a RAWR of 5500 but empty it only weighs 3500, I would maybe shoot for 3800 (to give a little buffer) and adjust your tires accordingling. In this example, if both axles carried 3800lbs of an empty truck, you could set your tire pressure at about 42 psi on all 4 tires. This would allow the truck to ride very comfortably, give even tire wear and likely produce better braking and handling. When you go to load the rear, inflate to the higher to carry the load and deflate for everyday, empty driving.
In my case, the '16 F250 crewcab 4wd calls for 65psi on all 4 corners. I changed tires from 275/70/18 to 295/60/20 and the new tires actually carry more load at 65 psi. For best ride and still allowing 5000 lbs capacity on each axle, I lowered them down to about 52 psi. The truck rides and handles great and can still carry the maximum load.
In the case of your truck, check the tag in the driver door jamb for the FAWR and RAWR. Those numbers are the max allowable load for each axle. Divide those numbers by 2 and get the needed tire weight rating and then use the chart to find the PSI.
Example: If the front axle has a FAWR of 4400, divide it by 2 and look for your tire size. The chart says that for the tire to safely carry 2200 lbs, it needs to be inflated to 50 psi. If the RAWR is 5500 lbs, the rear tires need to be set to 70 psi.
Now, if you mainly run around empty, it's worth filling up the fuel tank and taking your truck over a scale one axle at a time. The front will stay pretty constant because the engine is always there and carried mainly by the front axle. If your front axle has a FAWR of 4400 but the actual weight is 3800, I'd shoot for inflating to accommodate 4000lbs on that axle. The rear axle is where it can be extremely light or loaded. If the rear axle has a RAWR of 5500 but empty it only weighs 3500, I would maybe shoot for 3800 (to give a little buffer) and adjust your tires accordingling. In this example, if both axles carried 3800lbs of an empty truck, you could set your tire pressure at about 42 psi on all 4 tires. This would allow the truck to ride very comfortably, give even tire wear and likely produce better braking and handling. When you go to load the rear, inflate to the higher to carry the load and deflate for everyday, empty driving.
In my case, the '16 F250 crewcab 4wd calls for 65psi on all 4 corners. I changed tires from 275/70/18 to 295/60/20 and the new tires actually carry more load at 65 psi. For best ride and still allowing 5000 lbs capacity on each axle, I lowered them down to about 52 psi. The truck rides and handles great and can still carry the maximum load.
I appreciate the response! My problem is that i do not have that decal on my door jam any longer. Idk where i would find the oem decal at?
02-14-2021, 04:34 PM
#4
Senior Member
What engine/ trim package do you have? Also, check your registration and tell us the GVWR listed on that. With that info, you could look at 2004 brochures to get a fair guess as to what it might be.
02-14-2021, 04:37 PM
#5
Senior Member
Thread Starter
Last edited by McClain210; 02-14-2021 at 04:44 PM.
02-14-2021, 05:00 PM
#6
Senior Member
Based on those numbers and the load chart, 50psi in front and 80psi in the rear. That would be for a fully loaded truck. It will likely ride poorly empty. You could drop the rears to 50 when empty and still be safe.
02-14-2021, 08:01 PM
#7
Senior Member
Thread Starter
I tried 50 up front and it felt super spongy and my tires looked about flat. I went 70 all around. May go 65 front/70 rear.
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02-15-2021, 08:55 AM
#9
Senior Member
Thread Starter
I drove 70 all the way around this morning to work. A bit bumpy. I am going to do 65 all around and that should be good for me. I cant believe guys are running 50 psi with lt tires, they look flat when you drop them down that low. Maybe its just me.
02-15-2021, 10:30 AM
#10
Senior Member
