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Old 04-03-2019, 12:28 PM   #1
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Rear axle to match TTB front

Just put down a deposit with Agile on a conversion. However, being new to Ford parts, my head is swimming a little with the lingo. I currently have a semi-float D60, 3.73 gears, open. Unlike putting a newer Dana 60 up front, going TTB means I'll be keeping the 8x6.5 bolt pattern up front and not increasing width. This is an EB that will get a mild camper build out: high top, basic stove/sink, small fridge, house batteries, mtb storage, but no black water storage, hot water system, microwave, tv, etc. Closer to a weekender than a full time rig. Overland style wheeling - not rock crawling. My current 2 thoughts:

-Find a 4.10 D60 3rd member with limited slip and swap out the 3.73 3rd. The SF D60 is already rated for the full GVWR of the van, is it not? Swap it in, done. And cheap.

VS

-Find a 4.10 D70 - I'll be taking it off road, and it's peace of mind. As long as I pick the right year, and stay SRW, this should be essentially bolt on, yes? I believe this would also open up locker options. Buy once, cry once.

I'm assuming D70 having a 10.5" ring gear, is also called the Sterling? Or are those 2 separate things? Increasing track in the rear and/or switching to 8x170 is what I am trying to avoid, unlike most of the other FF/Sterling swap threads on here.

While I'm working on either axle, is it worth adding an anti-rotation truss? I do take my vehicles off road, however this will probably top out around a 4 rating due to the size. Thinking of Chris + V4 here where he spun an axle tube climbing a rock feature for that article awhile back.

Thanks
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Old 04-03-2019, 01:07 PM   #2
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I'd go D70. While the semi-float is rated for the weight of the van, that's also assumes stock tire diameter. And EB vans are pretty easy load up the rear axle.

The D70 came in two flavors. 9.75" in the vans and midship-fuel cutaways. This one will be the same width as what you have now.. Rear-fuel cutaways got the 10.5" version. This one is about 5" wider overall

You can upgrade the carrier if all you can find is the smaller version. The 10.5" is quite a bit harder to find. Or just keep the 9.75" setup if you aren't towing heavy.

Putting a locker in the full float is actually harder, because they are 32-spline while the semi float is 35 spline. Options are either a hybrid carrier setup, or swapping axles shafts (Napa sells them).

What year is your van? There are definitely compatibility issues by year.
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Old 04-03-2019, 01:40 PM   #3
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Mine's a 2005 V10.

And thanks, the nuances between these are a bit hard to keep track of at first.

I was looking through car-part and saw they listed the 9.75's as semi-float only, and the 10.5's as the only full float options.
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Old 04-03-2019, 03:01 PM   #4
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Quote:
Originally Posted by b. rock View Post
Mine's a 2005 V10.

And thanks, the nuances between these are a bit hard to keep track of at first.

I was looking through car-part and saw they listed the 9.75's as semi-float only, and the 10.5's as the only full float options.
That was the case for 2005 non-RSC vans.

Since the '05 V10 did not get RSC, you'll want a cutaway axle from '99-07' if you want the 10.5"/wide-track axle. You can also find a full float 9.75" D70 under '99-'01 vans and some '02s.
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Old 04-03-2019, 04:29 PM   #5
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Since CarringB hasn't brought it up yet......later RSC axles have different brake line routing and ABS tone ring stuff.....there...that's the extent of what I know...


and to identify those differences...CarringB??
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Old 04-03-2019, 04:44 PM   #6
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Since CarringB hasn't brought it up yet......later RSC axles have different brake line routing and ABS tone ring stuff.....there...that's the extent of what I know...


and to identify those differences...CarringB??
RSC axles ('05+ 5.4L wagons), and all '08+ axles, use outboard wheel speed sensors rather than a tone ring in the diff, along with 2-channel brake lines.

'05-'08 RSC vans were also all full float. '08 is the magic year where you would get the bigger brakes and full float. '09+ they went back to semi-float except in cutaways.
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Old 04-03-2019, 08:14 PM   #7
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Yup. I think you gotta find a cutaway van axle similar to your year after 09 to get the full floater. I also thought some F250 axles were compatible as well.


I thought about, then my head started to hurt. So I still have the stock Semi Float rear. I just like the way the Full Float hub looks. It's mean.
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Old 04-03-2019, 08:31 PM   #8
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Correct Flux. You'll want an '09+ axle. '08 might work but they had tooth count change partway through production (or possibly based on configuration). F250 axles with RSC (2011+ I think?) will also work, but they you'd have the 8x170 bolt pattern, so it makes less sense with TTB 4x4.
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Old 04-03-2019, 09:16 PM   #9
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F250 axles with RSC (2011+ I think?) will also work, but they you'd have the 8x170 bolt pattern, so it makes less sense with TTB 4x4.
I believe Agile can do TTB with 8x170 if needed.
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Old 04-04-2019, 08:43 AM   #10
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Sounds like the 99-01 D70 with the 4.10 is the best way for my van.

I'm assuming the 09+ Axle was directed at Flux? For an '05 w/o RSC that seems like it'd introduce the headaches of new brake lines and dealing with different abs sensors, no?

Also looking around at the locker options, there definitely seem plenty for the 9.75 RG - just have to deal with the spline count, which seems reasonable enough since if I'm getting an axle from a 99-01, it'll need some reconditioning anyway. That part I can deal with, van down time is a bit harder to manage.
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