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Open Roads Forum  >  Tow Vehicles

 > New version of Ford's 9.75" axle?

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Groover

Pulaski, TN

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Posted: 12/15/20 07:10am Link  |  Quote  |  Print  |  Notify Moderator

TFLtruck is reporting about a 3/4 float version of Ford's 9.75" axle for the F150 as something new. I know that the 9.75" axle has been around for ages but other than that I have no familiarity with it. Is this version actually something new? I have noticed in that through the 2020 model the highest tow ratings were not available with the 3.73 gear ratio that is often associated with the 9.75" gears but that changes with the 2021 model. Is this related?

TFLtruck really doesn't seem to know much about it other than it is holding up deliveries.

TFLtruck on 3/4 floating axle

BurbMan

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Posted: 12/15/20 08:12am Link  |  Quote  |  Print  |  Notify Moderator

So a 6-lug full floater? One more step to making the 250 unnecessary...maybe the marketing guys are moving toward eliminating the 150/250/350 lineup and just having 2 models, light duty and super duty. Would that be a bad thing? Most folks post here that the only difference between the 250 and 350 is the rear spring pack.


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ppine

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Posted: 12/15/20 08:20am Link  |  Quote  |  Print  |  Notify Moderator

F-350 comes with a 10.5 inch diff.
Dana 60 in the front.

dodge guy

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Posted: 12/15/20 08:51am Link  |  Quote  |  Print  |  Notify Moderator

If it’s what I think it is, it may be similar to the old Jeep Grand Cherokees where the bearings and seals were pressed into the axle shaft. This is the same design the 9” used and the old Chrysler 8 3/4, although those had a drop out center section.


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JIMNLIN

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Posted: 12/15/20 09:09am Link  |  Quote  |  Print  |  Notify Moderator

looking at the design in the clicky shows the 3/4 full floater uses ball bearings instead of tapered roller bearings like a HD full floater.
Having come from the era when ball bearings were much in use on those old cars and light duty trucks I would pass on having them on my truck.
Granted ball bearing have much less rolling resistance than roller bearing but at what cost in long term reliability.


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Posted: 12/15/20 10:39am Link  |  Quote  |  Print  |  Notify Moderator

"One more step to making the 250 unnecessary...maybe the marketing guys are moving toward eliminating the 150/250/350 lineup and just having 2 models, light duty and super duty."

All depends on sales volume. Possible.


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Posted: 12/15/20 11:16am Link  |  Quote  |  Print  |  Notify Moderator

Looks like the variant they’ve been using on the Transit.


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Posted: 12/15/20 11:19am Link  |  Quote  |  Print  |  Notify Moderator

Ball bearings can be reliable. There is an old power generating station in a ghost town named Sandon located in the Selkirk Mountains of BC. 17000 feet of wooden pipe brings water down the mountain feeding a turbine that has been running for over 100 years. It used to provide power for the town and a old nickel mine but now is tied to the grid. The shaft joining the turbine wheel to the generator is supported by the original wet ball bearings that have yet to require replacement. I suppose dirty gear oil might not provide the same level of lubrication.....


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Groover

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Posted: 12/15/20 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

JIMNLIN wrote:

looking at the design in the clicky shows the 3/4 full floater uses ball bearings instead of tapered roller bearings like a HD full floater.
Having come from the era when ball bearings were much in use on those old cars and light duty trucks I would pass on having them on my truck.
Granted ball bearing have much less rolling resistance than roller bearing but at what cost in long term reliability.


I was an engineer for Timken for nearly 20 years so I know a little about bearings. A properly installed taper roller bearing can carry more load in a given space but is more likely to be damaged by dirt or misalignment. I have seen both enjoy long lives or suffer short lives depending on how they are installed and taken care of. I have also seen ball bearing outlast tapered roller in industrial applications were there is a lot of dirt and alignment is difficult.

BenK

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Posted: 12/15/20 01:07pm Link  |  Quote  |  Print  |  Notify Moderator

Agree with everyone and add :

The old 3/4 ton Suburbans (GMT400) had the same AAM axle assembly as the 1 ton dually of the same year. Only difference is in the leaf spring pack/hangers/brackets and the brake cyclinder/MC

Why parts counter will ask how wide your GMT400 3/4 ton Suburban has....there two and the difference is in the width of the shoes and drum. The wider shoe/drum also is a full floater rear end.

As for ball bearings vs rollers vs tapered rollers is that the balls have a smaller contact point with the race. Therefore lower rolling resistance

Rollers have a larger contact point and has a higher load rating vs a ball, but in regards to dia, the roller is rated to carry more

Tapered rollers has a much higher axial thrust load rating. Straight rollers almost none and balls has some.

Been advocating tossing the marketing nomenclature (1/2-3/4-1 ton, 150/250/350, 1500/2500/3500, etc) for years and just go with their GVWR. If they toss the 3/4 a step in the right direction, IMHO


-Ben Picture of my rig
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Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
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