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Rich's F-150
February 5, 2019
1:52 pm
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kris_olof
El Dorado

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richfroh said
The pinion and carrier bearings are shot in my rear diff again. My options are: 1-rebuild this axle with a locker and all new bearings (maybe new gears if needed), 2- Install a 2008 or later F250 Super Duty axle with factory e-locker. 

Any thoughts?  

Start with an angry phone call or visit to the dealer that did the work last time.  There is no good reason that a rear pinion should be going out under 200k miles and zero reason to go out twice.  My thinking is there is an issue with the housing and it should be swapped.  If anything this might mean its time to make your move on that 75 you were dreaming of.

February 8, 2019
12:58 am
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richfroh
Acampo, CA
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kris_olof said

Start with an angry phone call or visit to the dealer that did the work last time.  There is no good reason that a rear pinion should be going out under 200k miles and zero reason to go out twice.  My thinking is there is an issue with the housing and it should be swapped.  If anything this might mean its time to make your move on that 75 you were dreaming of.  

I did call the dealer. They basically told me that the 2 year unlimited miles warranty they offer on all their work is the best in the industry, and since I am past my 2 years, I'm out of luck on this one. They did say that if I wanted to pay them to look at it, they would try to see why it is failing, but reminded me the chance of getting them to cover any repairs is very slim. I said no thanks!

The '75 is still going to happen, but it is probably a year or two out. For now I am looking at my options to fix it (hopefully with a locker) without breaking my small piggy bank. 

The cheapest option is to repair my OEM axle, but I don't trust it to live very long. I could get a used F150 axle with the e-locker, but they are going for $1,800 to $2,000. The F250 Super Duty axle is a full floater and is around $1,100 open or $1,400 with an e-locker. I would also need new wheels since it is an 8 lug, and some minor fab work to make it fit. I would also need to put wheel adapters on the front if I don't want to run mismatched wheel bolt patterns front and rear. I know a Super Duty front axle would fix the wheel bolt pattern problem, but unless someone is willing to donate a front axle, steering set up and some fab work, that puts it way out of my budget. I'm leaning towards the Super Duty axle with locker, but I have not been able to find the specs for the flange to flange width to see if it is close enough to work.

I've got to make a decision soon though, I doubt my diff is going to survive much longer.

February 8, 2019
12:10 pm
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kris_olof
El Dorado

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Give a call to sean at River City Diffs.  Might be able to give you another option we havent come up with.  Or at least a quote with a warranty.

The super duty swap seems like a lot of hassle and work for a rig you already plan on replacing.  There is a guy on craigslist parting out a 2011, open diff 3.55.  What is your gear ratio?

February 9, 2019
12:56 am
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richfroh
Acampo, CA
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Thanks Kris, I'll give them a call. You are right, the fact that I may only keep the truck one or two more years is part of my decision difficulty. If I was keeping it long term I would go with the Super Duty set up without question, but it is a lot more work. I have 3.73's now.

February 16, 2019
8:55 pm
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richfroh
Acampo, CA
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I've made the decision to replace my rear axle assembly, and picked up a F250 Super Duty axle. For now, it has the 3.73 gears that match what I have in the truck now. It has a limited slip diff. All the parts look good and usable. The only major mods will be moving the shock mounts, installing ABS tone rings and sensors, and shortening the driveshaft. I will probably add a locker and lower gears in the near future, along with a possible Super Duty SAS.

For those of you who have built your own axles, did you keep the disc brake dust shield or remove it?

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