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Old 09-29-2015, 08:18 AM   #29
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Quote:
Originally Posted by Scottybdivin View Post
The tires on the 20" wheels have a higher weight rating than 18". They go up to 3750 lbs.

Yes they do. The wheels however, have a lower rating.
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Old 09-30-2015, 03:27 PM   #30
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Yes they do. The wheels however, have a lower rating.
Just curious. Are they lower than the tires. I've never actually seen the load rating on the wheels on my trucks. I just assumed that they meet or exceed the tires.
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Old 09-30-2015, 03:54 PM   #31
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Just curious. Are they lower than the tires. I've never actually seen the load rating on the wheels on my trucks. I just assumed that they meet or exceed the tires.
That I can't remember. I researched it a while back when I wanted to know why the camper package excluded the 20" wheel option. The side to side sheer force that a top heavy truck camper can put on the rims was the factor that limited the wheel size for the camper package. Someone on the Ford forums posted a Ford doc with all the weight ratings but that was a couple of years back...
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Old 09-30-2015, 07:08 PM   #32
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There are quite a few 20" tires that are within 0.2" of the 18s and 17s--depends on which one your decide to run. There are also some 20s listed at 3" more in diameter. So, you could run 20s/18s/17s that are all within 3-4 tenths of an inch in diameter and never bother the trucks computer. On the other hand, to change from one of the 18s at 31.8" to a 20 at 34.5" could easily cause unwanted concerns.
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Old 10-01-2015, 12:16 AM   #33
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I have same programmed torque as the new F250 Diesels and believe me that I feel the difference between 31.6 and 33.1 OD tires. To me the 3.73 is the perfect ratio for 17 or 18 wheels. 19 and 20 would need 4.10 or better.
The F450 do have 19 in whees if I am right.
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Old 10-01-2015, 08:02 AM   #34
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I have same programmed torque as the new F250 Diesels and believe me that I feel the difference between 31.6 and 33.1 OD tires. To me the 3.73 is the perfect ratio for 17 or 18 wheels. 19 and 20 would need 4.10 or better.
The F450 do have 19 in whees if I am right.
The OP is looking at an F350 diesel. Only options are 3.31 & 3.55 gears, and 18" & 20" wheels. To get the lowest effective ratio he would have to get the camper or snow plow package that has 3.55 and 18".
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Old 10-02-2015, 04:08 AM   #35
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Ford has dropped the ratios to save on fuel mileage and forgot that we use our trucks for towing heavy loads. That's not for me. Plain and simple. My 2005 model will be my last.
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Old 10-02-2015, 09:35 AM   #36
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They may have dropped the ratios but that's only because they can. The towing capacities have continued to increase. My 1993(pre-power stroke) 7.3 had 4.10's. It needed more gears. My 2013 DRW had 3.73's and pulled my 20K toyhauler up 8% grades. The torque and HP have offset the need for lower gears. Our 2012 F550 has 4.30's, but it tows a 26K gooseneck every day.
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Old 10-02-2015, 11:13 AM   #37
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Exactly right Scotty....
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Old 10-02-2015, 06:16 PM   #38
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Question from the uninformed. Buying an F350 diesel, torque remains the same regardless of which rear end I purchase. I have plenty of payload capacity, haul capacity as I am not hauling a large fifth wheel. I would like some pros and cons to help me determine which rear end to get, 3.31 or 3.55. Is there much difference in the gas mileage and acceleration? Thanks in advance,
The lower the gear ratio, the better the acceleration and hill climbing ability. Higher gear ratios will give you better mileage at speeds of 65 to 80 MPH.
You need to decide what speed you travel at the most.
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Old 10-02-2015, 08:50 PM   #39
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Just curious. Are they lower than the tires. I've never actually seen the load rating on the wheels on my trucks. I just assumed that they meet or exceed the tires.
Fleet Ford spec shows the 18" and 20" wheels both are rated at 3590 lbs.
Covers Fords 7000 RAWR package nicely.
The 20" LT E tires with the 3750 lb rating gives a bit more reserve capacity for max axle loads.
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