P to LT? - Page 2

Ottawasteve · 01-16-2018, 10:01 AM

Quote:

Originally Posted by Jopopsy

Next question, if you don't have a HDP rim, how do you know your P rim can take that pressure?

Should not be any problem running up to 60 psi on any rims on an F150. I believe the Rims are stamped with the max pressure on the interior. If I was going to try and run the max pressure on the sidewall of an LT tire, I would look more closely into the max ratings on the rim. Before 2015 the HDP rims, were 7-hole, but the ratings on any of the available rims would exceed the RAWR even on the HDPP F150. Since the changeover in 2015, I am not sure what the weight ratings are on the 6 lug rims.

bdreinv · 01-16-2018, 12:27 PM

Doing that right now trying to buy LT tires need 235 80 R 16. Problem being LT truck tires only come in 17s wont work.Found Hartland ST Radial with a load index of 123 and speed rated at 87 mph.Speed rating and load index is about all you have to go on in trailer tires.Discount tire web site is pretty helpful.Thanks

dkos · 01-16-2018, 06:16 PM

When it was time for new tires I went with LT. The p tires did not feel great towing, and I hated the stock tires on everything but dry roads. The LTs feel much better towing and not too rough unloaded but do loose some mpg. Stock says 39 psi and I go 43 empty, per manufacturer recommendation, and 52/55 loaded. I would have liked to go with a LT d but did not want to buy new rims, truck came with 20's, so went up a size and LT e. I will not run P tires again.

Atlee · 01-17-2018, 02:12 AM

You are correct in noting the recommended tire pressure on the door panel is no longer correct when different tire size/type than OEM are used.

However, you are not 100% correct on the recommended air pressure of HDPP trucks.

I have a 2014 F150 4x4 XLT with MaxTow and HDPP. It came with OEM LT245/75R17 LRE tires. The recommended tire pressure on the door placard is 50# in the front, and 55# in the rear, which is what I keep my tires at.
Air pressure numbers as well as size, may have changed with the change over to aluminum in 2015 and newer.

Quote:

Originally Posted by Ottawasteve

Ultimately, I decided on 48 psi which is the same recommended inflation for the Heavy Duty Payload Package F150's that come from factory with LT tires and recommended inflation door placard is for LT tires. My truck weighs the same as the HDPP F150 so recommended tire pressure should be the same.

Ottawasteve · 01-17-2018, 08:49 AM

Quote:

Originally Posted by Atlee

You are correct in noting the recommended tire pressure on the door panel is no longer correct when different tire size/type than OEM are used.

However, you are not 100% correct on the recommended air pressure of HDPP trucks.

I have a 2014 F150 4x4 XLT with MaxTow and HDPP. It came with OEM LT245/75R17 LRE tires. The recommended tire pressure on the door placard is 50# in the front, and 55# in the rear, which is what I keep my tires at.
Air pressure numbers as well as size, may have changed with the change over to aluminum in 2015 and newer.

I should have specified that I have 18" wheels 275/65R18 and I looked up the recommended tire pressure for an HDPP truck equipped with 18" wheels and 48 psi was recommended by Ford front and back. Even 50 psi would be much closer than the 35 psi that dealer insisted was the correct inflation for my truck.

I haven't tried it, but I would imagine that unloaded with 55psi in the back would increase the amount of jitter in the back end ? Just wondering what your experience has been.

Atlee · 01-17-2018, 03:10 PM

I have rarely not had a load on the truck. In fact I have a fiberglass cap on it which supplies some weight. The few times I've driven it with the generators, gasoline, and other equipment not in the truck, it has driven well.

Quote:

Originally Posted by Ottawasteve

I haven't tried it, but I would imagine that unloaded with 55psi in the back would increase the amount of jitter in the back end ? Just wondering what your experience has been.

Gypsea · 01-18-2018, 11:43 AM

Atlee - What brand and model LT tires came on your '14 F150? I trust it also came with alloy rims. I'll plead ignorance here, but what does HDPP stand for? My concern, like others have stated, is a significant loss in ride and increase in tire / road noise with LT's vs P's. I have the steel rims that came on my base F150, so I thought I'd mount LT's on them and use during towing season, with the alloys & Michelin P's during 'off season'. Looks like we're towing a similarly sized TT.

SMS1115 · 01-18-2018, 12:29 PM

I switched on my 1500 and never went back. Yes, the stiffer sidewalls will help your towing experience, but I also found that the LT's have about 16/32" of tread depth versus the P that were 12/32" new. So I got more unloaded miles out of them than the P's also.

Atlee · 01-18-2018, 02:16 PM

First, HDPP is the Heavy Duty Payload Package. It's an option that can be ordered for the F150. However, they are pretty scarce. With my truck, the HDPP came with RGAWR of 4800#, GVWR of 8200#, and cargo capacity of 2286#. One other note the 2016 F150 was made of aluminum so some the gross weights are less than mine, but the CC would be very similar. The wheel base of my truck is 163", the longest of any F150. The HDPP trucks were 8' boxes for regular cab and Supercabs. Super Crew trucks were 6.5' boxes.

The OEM tires are BF Goodrich LT245/75R17 LRE, Rugged Trail T/A. As mentioned, Ford placard on the door said 50# front, and 55# rear. The rims are alloy with 2400# capacity.

I'm pretty happy with the truck. I would like to have a 4 door Crew Cab, but my dealer in Richmond, Virginia could only find 5 trucks with the HDPP within several hundred miles, all in Pennsylvannia and all SuperCabs.

Quote:

Originally Posted by Gypsea

Atlee - What brand and model LT tires came on your '14 F150? I trust it also came with alloy rims. I'll plead ignorance here, but what does HDPP stand for? My concern, like others have stated, is a significant loss in ride and increase in tire / road noise with LT's vs P's. I have the steel rims that came on my base F150, so I thought I'd mount LT's on them and use during towing season, with the alloys & Michelin P's during 'off season'. Looks like we're towing a similarly sized TT.

Gypsea · 01-20-2018, 10:35 AM

Atlee, thanks for info on HDPP designation. My truck is two-wheel-drive, so I'll likely take a less aggressive tread vs. your Trail T/A's. I'll also have to check on tire size as my 2wd sits lower than your 4wd effecting wheel well clearance. I'll also check my rim pressure rating. Many thanks. We go thru your area often as we have relatives in Richmond & DC. We're just down I-95 in NC. Lee

SkyBound · 01-21-2018, 09:38 AM

Quote:

Originally Posted by Atlee

First, HDPP is the Heavy Duty Payload Package. It's an option that can be ordered for the F150. However, they are pretty scarce. With my truck, the HDPP came with RGAWR of 4800#, GVWR of 8200#, and cargo capacity of 2286#. One other note the 2016 F150 was made of aluminum so some the gross weights are less than mine, but the CC would be very similar. The wheel base of my truck is 163", the longest of any F150. The HDPP trucks were 8' boxes for regular cab and Supercabs. Super Crew trucks were 6.5' boxes.

The OEM tires are BF Goodrich LT245/75R17 LRE, Rugged Trail T/A. As mentioned, Ford placard on the door said 50# front, and 55# rear. The rims are alloy with 2400# capacity.

I'm pretty happy with the truck. I would like to have a 4 door Crew Cab, but my dealer in Richmond, Virginia could only find 5 trucks with the HDPP within several hundred miles, all in Pennsylvannia and all SuperCabs.

The '11-'14 F-150 had 2 available wheelbases in SuperCab/SuperCrew; 145 inch and 157 inch. I'm not calling you a liar by any stretch of the means but where does the extra 6 inches of wheelbase come from for your 163 inch? Was there a change specific to the HDPP that gave the longer wheelbase? I'm genuinely interested as I have never heard of this.

GrumpyDad · 01-21-2018, 11:13 AM

Quote:

Originally Posted by SkyBound

The '11-'14 F-150 had 2 available wheelbases in SuperCab/SuperCrew; 145 inch and 157 inch. I'm not calling you a liar by any stretch of the means but where does the extra 6 inches of wheelbase come from for your 163 inch? Was there a change specific to the HDPP that gave the longer wheelbase? I'm genuinely interested as I have never heard of this.

I don't think such a vehicle exists in F150 supercrew form. Is the F150 Supercab with 8 foot box longer?

Atlee · 01-21-2018, 04:48 PM

Now that you have not quite "calling me a liar", I invite you to look up the tech specs on a 2014 F150. I'm also going to hopefully paste a quick web addy for you to check. If you go on the internet and look up a F150 manual for 2014 trucks you can also find that the 2014 F150 in either 4x2 or 4x4 can be bought with an 8' box.

But to answer your question. The Super Crew came in 5.5' and 6.5' boxes. The longer 6.5' box was required with the HDPP package. Coupled with the four door Super Crew cab, the WB was 157".

Now, for the Super Cab, it came in 6.5' box and 8' box, and the HDPP required the 8' box which resulted in a 163.1" wheelbase.

The WindowSticker.pdf is a copy of a window sticker. Up at the top it says 163" wheelbase.

https://media.ford.com/content/fordm...F150_Specs.pdf

Quote:

Originally Posted by SkyBound

The '11-'14 F-150 had 2 available wheelbases in SuperCab/SuperCrew; 145 inch and 157 inch. I'm not calling you a liar by any stretch of the means but where does the extra 6 inches of wheelbase come from for your 163 inch? Was there a change specific to the HDPP that gave the longer wheelbase? I'm genuinely interested as I have never heard of this.

Atlee · 01-21-2018, 04:56 PM

In F150 land, Supercrew trucks have as their longest box,
6.5, and 157" WB. The regular cabs and Supercab's have as their longest boxes, 8' which results in a 163" WB for the Supercab.

That's one reason I got my HDPP F150. Cargo capacity was much greater, and the longer hopefully would help in towing. One place it hurts is maneuvering in parking lots. It has a wide turning radius.

In the Superduty world, you can get the Super Crew cab and an 8' box.

Quote:

Originally Posted by GrumpyDad

I don't think such a vehicle exists in F150 supercrew form. Is the F150 Supercab with 8 foot box longer?

GrumpyDad · 01-21-2018, 05:25 PM

Thanks for clearing that up atlee. I never buy super cabs, so I don't have those memorized.

Atlee · 01-21-2018, 05:35 PM

I would have liked the Supercrew with the HDPP but my dealer couldn't find one. He found 5 Supercab F150's up in PA, and he arranged for one to be sent to him down here in Richmond, VA.

When hunting for a HDPP truck, which are nearly as scarce as the unicorn, you have to take what's available. I really wanted the extra cargo capacity that came with a HDPP truck.

Quote:

Originally Posted by GrumpyDad

Thanks for clearing that up atlee. I never buy super cabs, so I don't have those memorized.

GrumpyDad · 01-21-2018, 07:16 PM

Probably have to special order to find one.

SkyBound · 01-28-2018, 02:14 PM

Interesting. I always figured the SuperCab 8' bed was the same wheelbase as the SuperCrew 6.5' bed. Trade 1.5 feet of bed for 1.5 feet of cab. Learn something new every day.

I am well aware of the Super Duty line offering a 8' bed behind a Crew Cab. That will be my next truck.

Thanks for the info.

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