Full Float Axles
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New User
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Full Float Axles
I have a 2005 F-150 and I was wondering if there are any drawbacks to installing a 10.5 full float rear axle. I saw on another forum that the truck would "take more to turn the bigger axle". How true is this? Other than the different wheels, are there any drawbacks to doing this? I would like to increase payload.
Thanks.
Thanks.
Senior User
Joined: May 2011
Posts: 277
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From: Brantford
You can't increase payload because on the drivers door is a sticker that says the gvwr of the truck. There is no way to increase the gvrw of the truck other than jacking up the rad cap and putting a 3/4 or one ton underneath it.
Hotshot
Joined: Jul 2005
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"full float" refers to heavy 3/4 or 1 ton axles. You would have 8 bolt wheels with that setup...... The rest of the truck , as mentioned, would still be light duty... transmission / motor / springs / front axle / frame... etc ....... what are you trying to do ? If your putting more weight in the bed of the truck , you can add helper springs ... but don't go over the rating for the remainder of the truck......... If you want pulling power, change the rear axle gear ratio, not the axle type.
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I understand the GVWR would not be changed. I may be pulling near 9000 pounds and was concerned about tongue weight on the axle shafts.
I know the 5.4 can do it since it was an available engine on 2005 F-250s, and the frame is 36 thousand p.s.i., same as the F-250 frame I believe. Springs would be upgraded, so transmission would be the light duty part along with the front suspension.
I want to know how much more torque is required to turn the wheels on a 10.5 vs. a 9.75 axle.
Thanks!
I know the 5.4 can do it since it was an available engine on 2005 F-250s, and the frame is 36 thousand p.s.i., same as the F-250 frame I believe. Springs would be upgraded, so transmission would be the light duty part along with the front suspension.
I want to know how much more torque is required to turn the wheels on a 10.5 vs. a 9.75 axle.
Thanks!
Senior User
Joined: May 2011
Posts: 277
Likes: 1
From: Brantford
As far as turning a 10.5 vs a 9.75 i dont imagine its much. Dont forget most 150's with 5.4 motors will pull a 9k trailer and thats with a 9.75 axle. I Believe the rating on these are 3800 and 4050 lbs. Dont forget you shouldnt go over the gawr on the trucks and the fact if you had a larger axle you would go over gvw before you could gross out the heavier axle.
Cargo Master
Joined: Jun 2010
Posts: 2,113
Likes: 4
From: Iowa
I understand the GVWR would not be changed. I may be pulling near 9000 pounds and was concerned about tongue weight on the axle shafts.
I know the 5.4 can do it since it was an available engine on 2005 F-250s, and the frame is 36 thousand p.s.i., same as the F-250 frame I believe. Springs would be upgraded, so transmission would be the light duty part along with the front suspension.
I want to know how much more torque is required to turn the wheels on a 10.5 vs. a 9.75 axle.
Thanks!
I know the 5.4 can do it since it was an available engine on 2005 F-250s, and the frame is 36 thousand p.s.i., same as the F-250 frame I believe. Springs would be upgraded, so transmission would be the light duty part along with the front suspension.
I want to know how much more torque is required to turn the wheels on a 10.5 vs. a 9.75 axle.
Thanks!
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New User
Joined: Nov 2014
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Thanks. I understand now. I would be pulling around 9,000 pounds with a flat deck trailer so the tongue weight wouldn't be too much.
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Hotshot
Joined: Jul 2005
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With a trailer, you still load it so it has a given tongue weight. Normally that is 500- 700 pounds. The other 8500 pounds is on the trailer tires..... Your main concern should be brakes and transmission.. Your rear axle gear ratio will determine how fast you can get up to speed ..Drive shaft U joints may be smaller version also.
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Cargo Master
Joined: Jun 2010
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From: Iowa
You can put drilled/slotted rotors and aftermarket pads on for "increased brakeing performance" but my 05 expedition has more the adequate stoping power stock, pulled a 8000+# TT all over the Black Hills and unless going over 70 mph or pulling a very steep grade you could almost forget the trailer was back there. The two best things for towing I would recommend, A good weight distributing hitch with sway control and a good Electric brake controller as I've had some that were just plain annoying.
Cargo Master
Joined: Jun 2010
Posts: 2,113
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From: Iowa
What engine and axel gearing do you have? That will be the biggist limiting factors for what your looking to tow. I probably wouldn't try it with the 4.6 and definitely not with the 4.2. The 5.4 will struggle if you have 3.55 gears, 3.73 or lower are much better for towing.
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