'08-Up General QuestionsGeneral questions related to 2008-Up Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.
I weighed my 08 Crew Cab F350 srw V8 gas Lariat on the CAT scale at the local truck stop. The truck was empty, full tank, me inside this is what I got for weights
Steer Axle 4020 lbs
Drive Axle 3200 lbs
What tire pressures should I be running for the Goodyear Wrangler AT/S LT275/65R20E.
The center tread on the rears is almost bald at 14000 miles the fronts look brand new. Ford says 80psi in the rear and 65 psi in the front. You can't access the tire and rim assoc. charts any more on line. Like they are hiding something to sell more tires from premature wear from over inflation.
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2000,F250SD,SC,PSD,4X4,SB,6SPD.TRADED 2002 F250SD,CC,PSD,4X4,6SPD.TRADED Both bone stock,NO cackle!Rotella T,Stanadyne performance additive every tank.2 out of 2 an't bad. 2004 F350 CC 6.0 Torque shift,4X4,TRADED. 2008 F350 CC4X4 GAS!!!
I'd run 65 psi all the way around unless you are hauling. If you are hauling a load then add 5 - 10 pounds. Do you rotate your tires? You should be doing that every oil change or at least every other oil change.
Goodyear has the load/inflation charts on their website for most of the sizes of tires they sell. However, LT275/65R20 is a new size for them and they don't have it in their table yet. They do have LT275/65R18, which is a much more common size for 2005-up PSDs.
However, any brand of load/inflation table that includes that size will be right. The tables come from TRA, not from the tire companies. I suspected Toyo would have it on their site, but no luck there either.
I found an old TRA table on the website of the Rubber Manufacturers' Assn (RMA). It's from 2004, but it includes the LT275/65R20E on page 14 of 23 in the link below: https://www.rma.org/getfile.cfm?ID=606&type=publication.
Here's the table for LT275/65R20E tires mounted on single (not dually) axles:
About 50 PSI front and 65 PSI rear is about the most inflation you should ever need if you don't overload your pickup. That's enough for about 11,500 GVW. And if you have more than 11,500 pounds on the 4 tires of an F-350 SRW, you're overloaded. And if you have an F-250, then you're severely overloaded.
When unloaded, you need about 45 front and 35 or 40 rear. More than that and the center of the tire will wear off fast, and the ride of the truck goes towards the empty-dumptruck ride. 65 front and 80 rear is insane on an empty PSD.
Adjusting the PSI is a PITA if you switch from loaded to unloaded often. But I keep a good air compressor at the house, and adjust mine as necessary. I usually air them down for unloaded only when I know I'll be driving a lot of miles unloaded before I tie onto another trailer.
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My Sierra Blanca is a '99.5 PSD CrewCab hot-rod Towing Machine! BTS tranny; Ford Severe Duty Air Induction System (AIS); 4" stainless turbo-back exhaust; DP-Tuner tunes flashed into an Edge Evolution tuner; ISSPRO EV gauges and Turbo Temp Monitor (TTM); Auxiliary Idle Controller (AIC); SP-Diesel exhaust brake and torque converter controller. Top Job front end replacement. I special-ordered it new and plan to drive it until it quits.
Goodyear has the load/inflation charts on their website for most of the sizes of tires they sell. However, LT275/65R20 is a new size for them and they don't have it in their table yet. They do have LT275/65R18, which is a much more common size for 2005-up PSDs.
However, any brand of load/inflation table that includes that size will be right. The tables come from TRA, not from the tire companies. I suspected Toyo would have it on their site, but no luck there either.
I found an old TRA table on the website of the Rubber Manufacturers' Assn (RMA). It's from 2004, but it includes the LT275/65R20E on page 14 of 23 in the link below: https://www.rma.org/getfile.cfm?ID=606&type=publication.
Here's the table for LT275/65R20E tires mounted on single (not dually) axles:
About 50 PSI front and 65 PSI rear is about the most inflation you should ever need if you don't overload your pickup. That's enough for about 11,500 GVW. And if you have more than 11,500 pounds on the 4 tires of an F-350 SRW, you're overloaded. And if you have an F-250, then you're severely overloaded.
When unloaded, you need about 45 front and 35 or 40 rear. More than that and the center of the tire will wear off fast, and the ride of the truck goes towards the empty-dumptruck ride. 65 front and 80 rear is insane on an empty PSD.
Adjusting the PSI is a PITA if you switch from loaded to unloaded often. But I keep a good air compressor at the house, and adjust mine as necessary. I usually air them down for unloaded only when I know I'll be driving a lot of miles unloaded before I tie onto another trailer.
Good info. Personally, I run 65 PSI in all 4 of my tires all the time. I rotate every 10,000 miles (every other oil change) and I've got about 45,000 miles on my current 20" tires and they seem to be wearing evenly from what I can tell. But they are due to be replaced soon.
But I drive unloaded half the time and the other half I'm only towing a 6,000 pound boat / trailer combo.
Goodyear has the load/inflation charts on their website for most of the sizes of tires they sell. However, LT275/65R20 is a new size for them and they don't have it in their table yet. They do have LT275/65R18, which is a much more common size for 2005-up PSDs.
However, any brand of load/inflation table that includes that size will be right. The tables come from TRA, not from the tire companies. I suspected Toyo would have it on their site, but no luck there either.
I found an old TRA table on the website of the Rubber Manufacturers' Assn (RMA). It's from 2004, but it includes the LT275/65R20E on page 14 of 23 in the link below: https://www.rma.org/getfile.cfm?ID=606&type=publication.
Here's the table for LT275/65R20E tires mounted on single (not dually) axles:
About 50 PSI front and 65 PSI rear is about the most inflation you should ever need if you don't overload your pickup. That's enough for about 11,500 GVW. And if you have more than 11,500 pounds on the 4 tires of an F-350 SRW, you're overloaded. And if you have an F-250, then you're severely overloaded.
When unloaded, you need about 45 front and 35 or 40 rear. More than that and the center of the tire will wear off fast, and the ride of the truck goes towards the empty-dumptruck ride. 65 front and 80 rear is insane on an empty PSD.
Adjusting the PSI is a PITA if you switch from loaded to unloaded often. But I keep a good air compressor at the house, and adjust mine as necessary. I usually air them down for unloaded only when I know I'll be driving a lot of miles unloaded before I tie onto another trailer.
Thanks for the info. I know that 70 80 psi in the rear is insane but that's what Ford insists on. I even have a letter from Ford that states I must maintain the the tire pressures in the door pillar at all times or the truck will shimmy out of control. The guys that have air sensors must have a real pain if they air down to a sensible pressure. Who is responsible for my ruined rear tires after maintaining the recomended tire pressures and the unsafe tread wear it caused?
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2000,F250SD,SC,PSD,4X4,SB,6SPD.TRADED 2002 F250SD,CC,PSD,4X4,6SPD.TRADED Both bone stock,NO cackle!Rotella T,Stanadyne performance additive every tank.2 out of 2 an't bad. 2004 F350 CC 6.0 Torque shift,4X4,TRADED. 2008 F350 CC4X4 GAS!!!
Thanks for the info. I know that 70 80 psi in the rear is insane but that's what Ford insists on. I even have a letter from Ford that states I must maintain the the tire pressures in the door pillar at all times or the truck will shimmy out of control. The guys that have air sensors must have a real pain if they air down to a sensible pressure. Who is responsible for my ruined rear tires after maintaining the recomended tire pressures and the unsafe tread wear it caused?
I got that letter too. I can tell you my front end shimmy'd like crazy until I took the truck over to Walmart of all places and had them re-balance the tires. It has disappeared completely now.
Unless you got a tire warranty when you bought the truck you're pretty much SOL. Just make sure when you replace them you go with a local company that is going to offer some kind of warranty.
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