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Junior Member
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Discussion Starter #1
I know the F350's 4x4 will come with a 373 rear end. The F450's 4x4 will have a 430 rear end. Both use the exact same tire and rim size now. So my question is this, can you upgrade the F450 to the older style style wheels (19.5) that came on them standard back in 02-10?

If you add the 19.5's will that lower the overall gear ratio so it will be closer to something 410 gears?

Also what fuel economy are you guys seeing with F450's? Has anyone add the 19.5's to there F450 yet?

Any input is appreciated.
 

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Discussion Starter #2
Does any one have any input??
 

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I have a 2011 f-450 King Ranch with 4.30 and like it, fuel consumption on computer is around 15 MPG, (mostly town driving 75% 25% hiway, lot of idling because winter here)i'd like too know about the 19.5 wheels also.
 

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The 2011 F450 is 8x200mm on the rims so any previous 8 lug 200mm 19.5 will work. Basically the 2010 F350 and many others, are 8x200mm.

You can obviously go with adaptors and the possibilities are endless. I went with 22.5" rims and about a 36.5 tire that changed my overall ratio to about 3.7...so it cruises better on the highway but loses some MPGs in town. 16.5 MPG on the highway with hills and above 17 if it's flat.
 

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Discussion Starter #6
Thank you Zixxer for the information that is help full. I am wanting to add the factory 19.5's and was just curios to see if any has done it yet and how they like it.
 

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Junior Member
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Changing the tire and rim size will not change you gear ratio it will change the revolutions per mile of the tires. Does the same thing as a gear change!
 

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You can ask a tire shop the difference in revolutions per mile and get a percentage change from that.
I was under the impression the 2011's had a full box frame, I was just reading Pickups.com and they talked about it being a "C" channel frame. Anybody crawled underneath and looked?
 

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2011 F350 4X4
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... I was under the impression the 2011's had a full box frame, I was just reading Pickups.com and they talked about it being a "C" channel frame. Anybody crawled underneath and looked?
Don't know about the 450, but the 2011 F350 isn't fully boxed frame. It looks the same as the frame on my 2000 F350
 

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Don't know about the 450, but the 2011 F350 isn't fully boxed frame. It looks the same as the frame on my 2000 F350
Thanks that is what I thought!
 

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why'd they got back with C frame wasnt the whole kick fully boxed when the 08s came out?? sounds like they took a step back...
 

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What is the advantage of the 2011 450 over a 350? It appears the gvwr is the same. My local dealer told me Ford was going to come out with a job 2 a little later that will have about the same gvw as 08-10 F450.
 

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i have 2011 f 450 on a 2000 mile trip i only got 8.5mpg towing a 20' snowmobile inclosed trailer about 4500lb i asked the dealer if this in right he said what is wrong with that i was doing 70-80mph
 

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What RPM are you tuning at 70 to 80 mph?
What gear ratio do you have, and where you in tow haul, type mode?
 
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