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FX4 package force 9.75 axle?

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Old 08-21-2018, 10:24 PM
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Originally Posted by cgarison
All 3.5L EcoBoost trucks without MaxTow and without 3.73 gears have an 8.8 axle.
Can't speak for an '18+, but I've got a '17, 3.5 Ego, 3:55, AND a 9.75. No Max tow, or HDPP. I take it that was changed for '18+?
Old 08-21-2018, 10:38 PM
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Originally Posted by acdii
Don't waste money on FXjoke4. The front springs and shocks are crap, and all you really get are cheap skids, a button and stickers. My last truck a 16 Lariat had the FX4 package and the ride was mushy, sloppy, nose dived at every stop, and now I have an 18 plat without FX4 and the ride is so much better, handles so much better, and doesn't try to dig a hole in the ground when stopping. If you want the 3.55 9.75 axles order it. Code is L9. Comes standard with Max Tow, but you have to buy it as a separate option on the V8.
I will admit I've not driven all the various F150 models out their but my XLT with the FX4 pkg seems to handle just fine. I've read some comments on here that the FX4 pkg isn't worth the money but I bought the truck used and I wasn't specifically looking for one with or without it. I actually feel pretty good those cheap skid plates are there. We hit an object on the freeway at night shortly after purchasing. It rolled up under the truck pretty hard. The next day I crawled up under the truck and couldn't find a scratch. Who knows if the skids helped but I was glad they were there. If I had to nitpick I'd say the only thing I'd improve on if I could would be the ride is typical pickup truck...kind of stiff (not mushy) especially in the rear.

I expect a 60k plus Platinum would ride better by design verses a XLT but that's just a guess. I'd be disappointed if it didn't. I respect other peoples comments and opinions. This is just my experience with one particular truck...Pat
Old 08-21-2018, 11:15 PM
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Originally Posted by cgarison
All 3.5L EcoBoost trucks without MaxTow and without 3.73 gears have an 8.8 axle.

If you want the 9.75 axle, the best way to get it is by finding (or ordering) a truck with the Max Tow Package with the 3.5L EcoBoost option. This gets you the L9 - 9.75 rear axle with 3.55 gears, the 36 gallon fuel tank, and a rest of the stuff that is in the standard tow package. All 3.5L EcoBoost trucks without MaxTow and without 3.73 gears have an 8.8 axle.

If you want a 5.0L Coyote V8, then you must order the 3.73 gears to get the L9 - 9.75 rear axle which includes e-locker.

FX4 only gets you a different set of front shocks, skid plates, e-locker, (cheap and thin) skid plates, hill descent control, and all terrain tires. All of which (except e-Locker) can be added to the truck in from the aftermarket and all of it factory equivelent or better quality. And if you get the 9.75" rear axle, you have the e-locker built in as a part of that rear differential automatically. I won't say not to get the FX4 package (as I have it on my truck and like it) but if you are into hard core off roading, it will not help you in the long run and these pieces will have to be replaced with heavier duty options.

All 3.5L EcoBoost trucks without MaxTow and without 3.73 gears have an 8.8 axle.
you are right about the 5.0 and 3.73 getting the 9.75dif
however, my 2018 3.5EB 3.31 non fx4, non Max tow also has the 9.75dif
Old 08-21-2018, 11:37 PM
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Originally Posted by bsedwebt
F250 does not get the lane keep assist due to a different steering system - otherwise I would have it ordered instead. The F150 I have configured should come in at 1900lbs or better payload based on my research and end up at 2000lbs once I finish stripping off parts. I only need 1750lbs payload for what I am doing at this time but you never know when travelling what you may pick up along the way at the antique stores. My trailer is well within the tow specs of 9100lbs but when you add up the tongue weight, people, cargo, tow equipment, etc... I am at 1750lbs. Payload is always the weak spot when pulling a camper.
How much does the 9.75 "cost" in terms of weight penalty? I wouldn't think more than 50 lbs. The 9.75 is a more robust axle.
Old 08-21-2018, 11:46 PM
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To directly answer the OP. The ONLY way to get a 9.75 with a 5.0 is HDPP or 3.73. Since the HDPP comes with a 3.73 you can simplify it to the only way to get a 9.75 on a 5.0 is with a 3.73. The FX4 package is irrelevant.
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Old 08-22-2018, 03:57 AM
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Originally Posted by cgarison
All 3.5L EcoBoost trucks without MaxTow and without 3.73 gears have an 8.8 axle.

If you want the 9.75 axle, the best way to get it is by finding (or ordering) a truck with the Max Tow Package with the 3.5L EcoBoost option. This gets you the L9 - 9.75 rear axle with 3.55 gears, the 36 gallon fuel tank, and a rest of the stuff that is in the standard tow package. All 3.5L EcoBoost trucks without MaxTow and without 3.73 gears have an 8.8 axle.

If you want a 5.0L Coyote V8, then you must order the 3.73 gears to get the L9 - 9.75 rear axle which includes e-locker.

FX4 only gets you a different set of front shocks, skid plates, e-locker, (cheap and thin) skid plates, hill descent control, and all terrain tires. All of which (except e-Locker) can be added to the truck in from the aftermarket and all of it factory equivelent or better quality. And if you get the 9.75" rear axle, you have the e-locker built in as a part of that rear differential automatically. I won't say not to get the FX4 package (as I have it on my truck and like it) but if you are into hard core off roading, it will not help you in the long run and these pieces will have to be replaced with heavier duty options.

All 3.5L EcoBoost trucks without MaxTow and without 3.73 gears have an 8.8 axle.
I think to you need to learn what a 9.75 looks like. Not a single 3.5EB on my dealers lot has a 8.8. That includes the 2WD with an Open 3.15 Axle.
.
My ''18 XLT 302A 3.5EB with only the standard 53B Hitch Package has a 9.75.

Trucks with 9.75.

​​​​​2.7 Payload Package
All 3.0 PS
All 3.5 EB
5.0 with 3.73

​​​​​
​​​​​
​​​​

Last edited by Gene K; 08-22-2018 at 04:33 AM.
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Old 08-22-2018, 04:14 AM
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This has been better answered in other threads, but all 2.7 payload package, 3.0 powerstroke, and 3.5 Ecoboost have the 9.75 iirc. The 5.0s only get it in certain configurations. The fx4 doesn't affect it. Pretty sure it's also been verified that the fx4 doesn't change shocks or springs either in this gen truck. ETA: front shocks are different, rear are not.

Last edited by tazeat; 08-22-2018 at 03:32 PM.
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Old 08-22-2018, 04:39 AM
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To the best of my knowledge the FX4 has a different part number for the front shocks. The rears are the same part number as non-FX4.

That said my 2018 FX4 53B is the best riding truck I've ever been in. I honestly think my Buddies non-FX4 53A rides worse. I'm not sure if it's his Shocks or the Solid Front Swaybar.
Old 08-22-2018, 06:09 AM
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My 2015 3.5EB FX4 with the 3.31 rear has the larger sized rear.
Old 08-22-2018, 07:05 AM
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Originally Posted by bsedwebt
F250 does not get the lane keep assist due to a different steering system - otherwise I would have it ordered instead. The F150 I have configured should come in at 1900lbs or better payload based on my research and end up at 2000lbs once I finish stripping off parts. I only need 1750lbs payload for what I am doing at this time but you never know when travelling what you may pick up along the way at the antique stores. My trailer is well within the tow specs of 9100lbs but when you add up the tongue weight, people, cargo, tow equipment, etc... I am at 1750lbs. Payload is always the weak spot when pulling a camper.
Psst... between you and I, lane keep would not be something I'd be super worried about whether my truck had it or not... (I've got it, rarely use it). I don't know your circumstance and don't walk in your shoes, but I'd buy a truck that is capable for what I need it to do and it looks like you may be in F250 territory w/ your trailer. Good luck!


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