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D70 / 14B-FF / Sterling (Ford) 10.25" ... All pretty similar in strength. You can get way deep gears for a 70 though.

As said, the D60 (FF rear) doesn't compare to any of those.
 
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owns a 30sp 60

equal to if not slightly weaker than a 14bt
I beg to differ.

there was a big thread on this way back.

a couple of examples, 35 vs 30 spine even though the outer dia is 1.5" on both, more splines means stronger.

Nodular iron case vs whatever they could find in the scrap bins for the 14-bolt.

Lockers can be found cheaper and better selection, although I think the gap is closing.

14-bolt pwns d70 in setup ease though the nod goes to d70's for strength.
 

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Dana 70 or 14 bolt, almost equal.
The Detroit Locker in a 70 is better than a 14bolt.
More gear ratios for the 70.
I have broke a 35 spline 70 shaft, but never a 14 bolt.
Two of my trucks use 70s, two use 14 bolts.
Both are cheap in stock form ($50) and upgrade parts cost about the same.
Around here Jeep guys swap in dually 14bolts because they are narrow. And some prefer dually Dana 70s because they are wide and work well with H1 wheels.
My $.02
 

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I beg to differ.

there was a big thread on this way back.

a couple of examples, 35 vs 30 spine even though the outer dia is 1.5" on both, more splines means stronger.

Nodular iron case vs whatever they could find in the scrap bins for the 14-bolt.

Lockers can be found cheaper and better selection, although I think the gap is closing.

14-bolt pwns d70 in setup ease though the nod goes to d70's for strength.
14 bolt shafts and ring and pinion are stronger than D70 stuff. More splines are generally stronger but the splines are not the weak point for either shaft. 30 spline 14 bolt shafts have proven to be definitively stronger than 35 spline D70 shafts. Mechanical 14 bolt lockers are cheap and gear setup is easy.

D70's usually have larger tubes than 14 bolts and lower available gears.


Unless you need super low gearing, the 14 bolt is the right choice.


The rear FF60 isn't even close to a D70 or FF14 bolt, its closer to a 10 bolt.
 

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My 70 is the 32 spline dodge variety. after osme research gears are expensive as fuck for these things
I just put regular 5.13s in mine. Genuine Spicer, (packaged as Richmond I think??) I got them from PORC for under $200....

Didn't seem bad at the time?? 2005, rear end is a '98 Dodge.

You can swap in 35 spline shafts from a similar year Dana80 and use a regular old 35 spline carrier too...

Housing is fricken heavy though. With drums at least as heavy as any of the SRW 14 bolts I have messed with. perhaps heavier...

On an overall strength, I have never seen a 14 bolt shaft shatter like my 70 shafts (broke on both ends, twisted the splines on many, and of course the normal shear breakage).

They are both good axles though, if you are happy with 5.13s, I would get a 14 bolt though. If you want 5.86s or 7.17s, its an easy decision. :flipoff2:
 

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I thought you could swap in 14B axles & spiders into a 70? goddamit, I looked for the thread, but after 30 seconds I remembered I don't care about it that much.
 

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Jesus! do we have to have this debate again?

I dont forsee anyone taking their 70 to the junk yard and swapping an identically setup 14bt or vice versa.

Very strong axles and its pointless to argue for 15 pages on which is "stronger"
 

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Around here Jeep guys swap in dually 14bolts because they are narrow. And some prefer dually Dana 70s because they are wide and work well with H1 wheels.
My $.02
Those aren't dually 14 bolts, they are cab and chassis 14 bolts. Dually Chevys had Dana 70s in years past.
 

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"Those aren't dually 14 bolts, they are cab and chassis 14 bolts. Dually Chevys had Dana 70s in years past."

Arent all dually 14bolts narrow?
 

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"Those aren't dually 14 bolts, they are cab and chassis 14 bolts. Dually Chevys had Dana 70s in years past."

Arent all dually 14bolts narrow?

14bolt ff is 67'' wms/wms when its got the cab and chassis hubs its 63.5''

my dually 70 rear is 72.5'' wms/wms
 

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14bolt single wheel is 67'' wms/wms -1978 Chev K30

14bolt dual wheel/cab and chassis is 63.5'' -1986 Chev K30

Dana 70 Chevy dual rear is 74.25" -1981 Chev motorhome

Dana 70 Ford single wheel 67" - 1979 Ford F-350

These are the 4 in my trucks.
 
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