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Old 07-06-2014, 05:32 PM   #11
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Originally Posted by acadianbob View Post
Also, do you have P-metric tires? You might consider LT tires; load range C would likely be enough. Our newer F150 is nearly identical in configuration to the previous model. One difference, the newer truck has LT tires. We have discovered that there is a LOT less rear bounce with LT tires due to the stiffer sidewall.
Disagree. Tires of the same size, P-series compared to LT load range C tires, the P-series tire will be stronger.

Example: 275/65R18 is standard on a lot of our F-150s.

P275/65R18 has weight code of 116 = 2,756 pounds @ 44 PSI.

LT275/65R18C has weight code of 113 = 2,535 pounds @50 PSI.

To improve on the weight capacity of the stock P-series tires, you have to move up to the LT with load range E, weight code 123 = 3,415 pounds @ 80 PSI.

So if you have a late-model F-150 4x4 with P275/65R18 tires, you can move up to LT275/65R18E.

But my 4x2 has P265/60R18 tires, with revs/mile of 681. Nobody I can find makes LT tires that size. I could go to LT275/65R18E, but they have revs/mile of 651. So my speedo/odo/trip meters would be slow by 4.6% unless I paid my Ford dealer to recalibrate the speedo for the taller tires. And unless the dealer is a dear friend, he will charge you a minimum of one hour labor to do that little deed.

Granted, 18" LT load range C tires will weigh about 8 pounds more than P-series tires of the same size, so maybe that translates into a stiffer sidewall. But it does not translate into a stronger tire with more weight capacity.
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Old 07-06-2014, 06:55 PM   #12
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Originally Posted by smokeywren View Post
Disagree. Tires of the same size, P-series compared to LT load range C tires, the P-series tire will be stronger.

Example: 275/65R18 is standard on a lot of our F-150s.

P275/65R18 has weight code of 116 = 2,756 pounds @ 44 PSI.

LT275/65R18C has weight code of 113 = 2,535 pounds @50 PSI.

To improve on the weight capacity of the stock P-series tires, you have to move up to the LT with load range E, weight code 123 = 3,415 pounds @ 80 PSI.

So if you have a late-model F-150 4x4 with P275/65R18 tires, you can move up to LT275/65R18E.

But my 4x2 has P265/60R18 tires, with revs/mile of 681. Nobody I can find makes LT tires that size. I could go to LT275/65R18E, but they have revs/mile of 651. So my speedo/odo/trip meters would be slow by 4.6% unless I paid my Ford dealer to recalibrate the speedo for the taller tires. And unless the dealer is a dear friend, he will charge you a minimum of one hour labor to do that little deed.

Granted, 18" LT load range C tires will weigh about 8 pounds more than P-series tires of the same size, so maybe that translates into a stiffer sidewall. But it does not translate into a stronger tire with more weight capacity.
Sounds like a perfect excuse to buy a programmer

Reset for different size tires and pick up some extra HP, TQ and MPG!
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Old 07-07-2014, 12:01 AM   #13
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x2
. shocks for sure. A WD for a single axle 4,000 lb trailer is crazy.
This. I have removed f150 shocks on a truck that wasn't very old and I could compress the shocks by hand and they wouldn't rebound. Buy new shocks...
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Old 07-07-2014, 09:12 AM   #14
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Originally Posted by smokeywren View Post
Disagree. Tires of the same size, P-series compared to LT load range C tires, the P-series tire will be stronger.
...
Granted, 18" LT load range C tires will weigh about 8 pounds more than P-series tires of the same size, so maybe that translates into a stiffer sidewall. But it does not translate into a stronger tire with more weight capacity.
Am currently running LT-E's at 50psi which gives them about the same weight rating as the OEM P's. The LTs do translate into a stiffer sidewall given the same weight rating. This gives a "crisper" ride, which is the main point.

I also suspect that the LT's heavier construction translates into a tire more resistant to punctures, pot-holes and road debris. In that sense, I suspect they are "stronger" even if they have the same weight capacity of a P tire.
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Old 07-07-2014, 10:59 AM   #15
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I replaced the RSA's with LT Falken Wildpeaks and they give a much crisper feeling. The RSA's were floaty.
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Old 07-07-2014, 02:34 PM   #16
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Originally Posted by seaeagle2 View Post
Have you checked your tongue weight, boat trailers are a different animal that "normal" trailers. they're usually set up different than other trailer types. I have a non tow package 2010 F150 and it towed my 18 Trophy without any bounce.

When I purchased the boat, the dealer adjusted the tongue weight to what I remember as 10% of the boat weight. I remember it was somewhere in the neighborhood of 300 lbs. I pulled a double axle uhaul trainer several hundred miles and had similar bounce feeling. Depending on the road conditions, its not always pronounced. Just trying to resolve with the least out of pocket and DYI. Thanks for the feedback.
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Old 07-07-2014, 02:34 PM
 
 
 
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