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Old 08-05-2013, 10:33 AM
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Rear end

I got an 01 f450 that's got the 550 rear end. I HATE the gears. Didn't put the rear end in and I want it gone! Am I better off just changing the chunk or the whole rear end?

Right now at 70mph I'm at 2700 Rpms. I wannabe at like 2300 at 70. What gears do I need?


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Old 08-05-2013, 11:44 AM
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YOu probably got a set of 4.30 in that rear end.

i have 3.73 and at 70 im runnin about 2000 RPM

I think you would want a set of 4.10's and i would just change the gears. will be the cheapest solution unless you have a 2x and can find someone to trade you straight up.
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Old 08-05-2013, 01:58 PM
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Now would the fact that its on semi wheels make a difference?


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Old 08-05-2013, 02:22 PM
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Not quite sure. I dont know much about the 450 and 550 axles. Someone with more experience will hopefully chime in. I didnt think about the fact that you probably have different transmission gearing so i really have no idea what gears you have. Easy way to find out, jack rear end up so 1 tires is off ground, rotate driveline. count how many times you turn your driveline for 1 full rotation of your tire. IE: if you rotate your driveline 4.10 times and your tire rotates 1 complete turn you have 4.10 gears.

Can you post a pic tho in case someone wants to see your setup. I know lots of people do a hub conversion that changes the 8 lug to a 10/12 (not sure which one) lug to run the semi wheels. If the previous owner swapped the axle i wouldn't put swapping the hubs out past him.
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Old 08-05-2013, 02:47 PM
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it should be a dana 80 with i think 4.88 gears. change to 4.10. you will need to find a shop to set them up. what wheels you have does not matter
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Old 08-05-2013, 10:52 PM
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Dana 80's were used in 350 DRW trucks. The 450/550 use larger axles. I don't recall the exact model but it will be something like a dana 110 or 125. Tire size will affect your final drive ratio so if you went to 40" or so tires, the RPM would drop. What you need to do is look for a tag on the axle so you can determin the model then from there you can find out what gears are available. Figure out what ratio you have by spinning the axle like stated above and pick a ratio that will get you close to the RPM you want.

Another option to look into would be a overdrive from Gearvendors.
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Old 08-06-2013, 02:55 AM
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Rear end-imageuploadedbyag-free1375786421.342343.jpg
And it's on the biggest set of 8lug 19.5s. It sucks. I want it on the 24.5s. Which measure out to be 42s. Someone told me that it's got 5.33s in a Dana 110 ill look for a tag today


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Old 08-06-2013, 11:12 AM
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whats the last 8 of the vin. I work for ford so I can tell you what your supposed to have. If your looking for lower rpms, then I strongly suggest a built trans from john woods, and a set of 3:73. I had a stock trans and at 70 was turning around 2250-2300, now with the trans at 70im about 1650-1700.
if you want to still have a little more torque then id go with 4:10's. its a better towing gear and better for the bigger wheels and tires
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Old 08-06-2013, 01:46 PM
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Well I just bought a set of full 24.5 semi wheels so it'll should help just gotta find adaptors.


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Old 08-06-2013, 05:05 PM
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The vin number won't give me anything. It not the original rear end.


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