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I touched on this a couple months ago, but let me re-fresh and ask another question...to see if it can be answered. To me....and...I may be wrong...but I "see" what appears to be a different lug pattern on the 20" 645 rim vs. the 20" 64U rim. Look REAL close and you can see what I'm talking about. the 64U has a defined circle around the perimeter or the lugs. The 645 has a tighter lug pattern and does not have the circle. The reason I say this is....the 64U can ONLY be had with a SRW F350 with the diesel engine. The 350 with a diesel is N/A on the 645 20 inch rim...but it appears you can get an F350 gas with the 645. So my point was...on my truck I ordered an F250...AND got the F250 Heavy Duty tow package. This automatically ups me to the...what I see...wider bolt pattern 64U rim and the package also states..."UPGRADED AXLE". So final question....does the upgrade to the UPGRADED AXLE give the 250 and the 350 Diesel a wider bolt pattern due to a bigger axle?? You can even see the rims(center hubs) "change" on my truck on the Ford builder when you check and un-check the F250 Tow Package option.
As I said before, I'd be amazed if Ford broke tradition with what it, and the other HD truck makers, have always done - used a standard, single hub and lug design for all the different trims and capacities. It would seemingly be much more costly to have two different wheel lug patterns or spacing. Wouldn't it be cheaper to just fit the overkill hub on the gas models?
There will be two axle options for the SRW trucks. Wish I could dive into it more, but I can't
The 645 20s don't have the classic removable hub cover. Everything is machined then they pop the little plastic Ford cover on like a dust cap for trailer wheels. Here is a pic of the Platinum 6.2 we saw at KTP:
The 64Us have the traditional removable covers like we have currently. They never specified any lug pattern changes going to the new axle. Maybe what is throwing it off visually is the absence of the "larger appearing" hub cover.
Two axle options...hmm. I'm thinking the Powerstroke was beefed up? Bigger, stronger, able to handle the extra TQ.
Just a guess. I'm assuming nothing changes for us 6.2 gas buyers.
Two axle options...hmm. I'm thinking the Powerstroke was beefed up? Bigger, stronger, able to handle the extra TQ.
Just a guess. I'm assuming nothing changes for us 6.2 gas buyers.
Why would you want it to? Beefier axles designed to handle more torque will make the truck heavier, get worse fuel economy, and have more unsprung weight - translating to more bump steer, worse ride quality, handling, etc. The current axles on the 2016 Super Duty are already overkill for the gas engine. The 6.2L is getting some kind of power bump - so it will probably better utilize the current axle design.
I'm guessing the rear axle needed to be increased for the insane tow ratings the new truck might have.
No not wanting a change for the gas - just speculating that it must be for the Powerstroke. Ford has to keep stroking the egos of the guys who think they need a diesel to tow a bumper pull camper or a ski boat
No not wanting a change for the gas - just speculating that it must be for the Powerstroke. Ford has to keep stroking the egos of the guys who think they need a diesel to tow a bumper pull camper or a ski boat
Hey, if I was towing a bumper-pull 32' camper that weighed in around 7500 lbs and I was going long distance, I'd probably want the diesel too!
But you're right, a lot of folks buy diesel because they like the image, or the extra power, but they don't really need it.
I wonder if the rims on the order guide coincide with the different axles. The claim is no change in the bolt pattern, but it looks like you can get basically an identical wheel "only on a gas" or "only on a diesel."
Hey, if I was towing a bumper-pull 32' camper that weighed in around 7500 lbs and I was going long distance, I'd probably want the diesel too!
But you're right, a lot of folks buy diesel because they like the image, or the extra power, but they don't really need it.
I wonder if the rims on the order guide coincide with the different axles. The claim is no change in the bolt pattern, but it looks like you can get basically an identical wheel "only on a gas" or "only on a diesel."
I pull a 35 foot bumper pull...really heavy tongue weight due to a front bedroom slide.....and yes....a gas could do it....BUT a diesel does it SOOOO much better. Also Troverman....we discussed this before. The rims are not necessarily "GAS" for the 645 or Diesel for the 64U....because you can get a gas F250...but if you get the HD 250 Tow Package it bumps you up to the 64U beefier rim. So I don't think it (the upgraded axle) is exclusive to the diesel. BUT...it is exclusive to the F350 SRW Diesel.
