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It may not be an issue for anyone here considering the change but do be aware that changing from 16" to 17" will reduce towing capacity by around 500# and vice-versa.
I don't know about what you guys want to tow behind your truck but I pull my 42 foot boat around 8000 pounds and my buggy around 7000 and bobcats. With no proploms and I have 315/70/R17
Haha my point exactly ;-)
I must see pictures of this boat on your expy!
Yes, why would going to a smaller wheel change your towing capacity?
If anything, the smaller radius if the wheel should INCREASE the capacity of the wheel (due to leverage on the shorter radius).
For years upon years the most widely used wheel size on work trucks was 16". Look back to any 3/4 or 1 ton truck before the year 2000. Everything had 16" wheels with an 8 lug bolt pattern. Therefore, it is still incredibly easy to find 10ply tires for use on a 16" wheel.
Hate to tell you, but your information source is incorrect. 16" wheels will not give you any less towing/hauling capacity over a 17".
I don't know about what you guys want to tow behind your truck but I pull my 42 foot boat around 8000 pounds and my buggy around 7000 and bobcats. With no proploms and I have 315/70/R17

Aah makes more sense, I thought you may have been referring to ratings based on wheel size, I'm wondering if those ratings are affected more due to the overall circumference of the wheel/tire setup rather than the rim size?? Hmmmm lol
If most of your towing is in Florida then you have fairly flat ground and I have no doubt you can tow that capacity. I would be hard pressed to pull 8000# with my Expy over Mt. Hood with a 6%+ grade and elevation of over 4000 feet. At least not at any reasonable speed.![]()
Sorry if my post was not clear. I was stating that the 16" wheels will give you about 500# more towing capacity than the 17" wheels. You are right that the typical size for wheels was 16" for that reason. While no source is perfect, I tend to use Trailer Life Magazine's Trailer Towing Guide as a point of reference. This link will show Trailer Life's Towing Guides from model year 1999 - 2014.
For the 2000 Expedition 5.4L 4X4 Trailer Life gives three different tow ratings
6,400# with a 3.31:1 axle ratio
6,900# with a 3.55:1 axle ratio and 17" wheels
7,400# with a 3.55:1 axle ratio and 16" wheels
And 3.73 gears? With 17in tires
IIRC the 3.73 adds about 500# towing capacity over the 3.31.