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Old 06-03-2015, 08:45 AM   #11
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Originally Posted by dustman_stx View Post
Both are great trucks. You need to go back to that Ford dealer and drive a 3.5L Ecoboost with your trailer in tow. Get it out on the highway in tow haul and set the cruise on 65. You'll be amazed. Of course, you are really supposed to have 1000 miles on one before you tow with one- maybe the dealer would have a used one you could do a test-tow with???? If going with a V8 in either the Tundra or the F150, I'd opt for lower gears than the EB would require. The 4.30's in the Tundra or the 3.73's in the F150- both result in the same final drive ratio in each gear because of tranny gearing. Tundra guys think they've got a towing beast with "super low 4.30 gears", when in reality, once again, they offer almost identical ratios as the Ford 3.73's. If going with the EB, 3.73's would be fine, but 3.55's are perfectly adequate.
Side note - What is the potential harm in towing with under 1000 miles on TV? I had no choice but to pick up my TT and drive 50mi with about 200mi on my new TV. Also did first weekend trip (100 mi each way) with about 700-800mi on TV.

2014 Rockwood 8310SS Diamond
2014 F-150 Super Cab Ecoboost w/Max Tow

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Old 06-03-2015, 08:51 AM   #12
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Originally Posted by wpgman19 View Post
Side note - What is the potential harm in towing with under 1000 miles on TV? I had no choice but to pick up my TT and drive 50mi with about 200mi on my new TV. Also did first weekend trip (100 mi each way) with about 700-800mi on TV.
I can't give you an exact technical answer on that one. I suppose maybe the rings haven't seated fully so you don't want a heavy load until a break in period is over? That's just what Ford recommends, IIRC. I'm sure others can tell you exactly. I'm also sure that there will be many accounts of people driving them like they stole them from day one with good results!

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Old 06-03-2015, 01:30 PM   #13
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The main reason is to allow the differential to break in before putting it under load. The gears as assembled need some heat cycles to break in and seat. Prior to break in there is a higher degree of deflection that could cause issues under heavy loads. Dodge and Nissan both had problems with rear diffs spitting teeth due to heavy loads being placed on the diff before it was broken a few years back. You can probably Google Nissan Titan and busted diff to see some of the carnage. That being said I have yet to spit a diff on a Chevy or a Ford due to tow loads. I don't like to exceed 3/4 of the rated tow capacity so I probably never pushed my luck. You may be fine and likely will be fine. In the old days rings required 3000 miles to seat but now a days with the tight tolerances, synthetic fluids and materials used I don't know if that is still an issue. The 1000 mile recommendation is a cya from the factory. My class C rolled out of the factory fully loaded and didn't have any problems and I tow 3500 lbs behind it regularly on top of the vehicle being near GCWR.

If you spit your diff at 15000 the dealer will likely ask you if you broke in your truck prior to towing.
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Old 06-03-2015, 09:38 PM   #14
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So I have pulled the trailer around the block with the f150 and tundra crewmax. I have to say the tundra feels a lot more improved from my 2004 f150.

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