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Unread 01-05-2013, 10:33 AM   #1
MGDWJ
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78 hp dana 44 to jana 54

Two questions
1.
I have the chance to get a 78-79 hp dana 44 off of a f250. What is it worth?
2. I am wanting to do the jana 54 kit. Dana 50 gears in a Dana 44 housing. Anyone have experience with this. I haven't decided which of my jeeps is going to get the axle. Either my jk ow my wj.

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Unread 01-05-2013, 01:36 PM   #2
ratmonkey
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they're not common, not uncommon, but it's the best housing you'll find for an hp44 IMO. thick tubes, extra ribbing on the center. i paid 250 for mine with a ff60 rear to match from the same truck.

having just built it with the ford 3/4 ton flat top knuckles and 8 lug hardware, i'd do it with chevy 8 lug instead next time. these ford brakes are a bit of a pain.

i would hold off on the jana kit, personally. i haven't heard of many hp44 gear sets breaking when a good carrier is used, even with the strongest shafts you can buy and drive flanges.
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Unread 01-05-2013, 03:31 PM   #3
jason m
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I agree with Rat, I would hold off o the 50 gears, why have a stronger set of gears only to have the shafts be breaking all the time.
The main reasion to have the 50 gears in a 44 housing is for guys who want to weld on the 60 outer C's and run the 1480, 1.5 shafts in the 44 housing, this way the HP 44 gears are not the weak point.

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Unread 01-05-2013, 04:42 PM   #4
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So even with 1.5" 35 spline rcv's the dana 44 ring gear will be stronger than the shafts.
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Unread 01-05-2013, 05:53 PM   #5
ratmonkey
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what are your tire size plans first of all?

and yes, unless you are doing the d60 outers with the j54 kit i wouldn't even think about it.

by the time you buy all the stuff for a 35spl j54 with d60 outers and custom shafts you could have just bought a 79 hp60.

and food for thought on the gears themselves.

Dana 44

Ring Gear Diameter: 8.5
Pinion Shaft Diameter: 1.375
Pinion Splines: 26

Dana 50

Ring Gear Diameter: 9.0
Pinion Shaft Diameter: 1.377
Pinion Splines: 26
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Unread 01-05-2013, 06:59 PM   #6
jason m
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Quote:
Originally Posted by MGDWJ View Post
So even with 1.5" 35 spline rcv's the dana 44 ring gear will be stronger than the shafts.
Nope, but the stub shaft will pop long before the inners or the ring gear do.

Really if your going threw all this what size tire and why not a 60? At least you will know you can throw a 39" at them in stock form and make it work. Again what size tire????

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Unread 01-05-2013, 07:49 PM   #7
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I doubt he'll will pop a RCV stub? The gears are the weak point in this set up. The Jana kit is really not much more than just a standard rebuild so I say go for it and have fun with the rebuild knowing you have a hell for stout D44! The Housing you have is awesome and the Jana kit only makes it more so
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Unread 01-05-2013, 07:55 PM   #8
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Quote:
Originally Posted by CZDiesel View Post
I doubt he'll will pop a RCV stub? The Jana kit is really not much more than just a standard rebuild so I say go for it and have fun with the rebuild knowing you have a hell for stout D44! The Housing you have is awesome and the Jana kit only makes it more so
Yes but before we go to far down the rabbit hole we need to see a tire size, thats key here.

Plus the stubs will be the fuse in the hole drive train, there a heck of alot smaller than what he will have for inners RCVs or not. Again I would to see a tire range first.

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Unread 01-05-2013, 08:03 PM   #9
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Will be running 37-38's. My way of thinking was a 44 with the j54 kit and 35 spline rcv's would have the same shaft strength as a rcv 60 a lot stronger gear set granted not as strong as a 60 for a lot less coin.
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Unread 01-05-2013, 08:10 PM   #10
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Quote:
Originally Posted by MGDWJ View Post
Will be running 37-38's. My way of thinking was a 44 with the j54 kit and 35 spline rcv's would have the same shaft strength as a rcv 60 a lot stronger gear set granted not as strong as a 60 for a lot less coin.
How do plan on addresing the smaller Dia stubs? There not going to be any bigger, yes stronger steel but not 35 spline 1.5" strong like your inner or a standard dana 70 stub in a 60 hub.

37's and RCVs should work fine, the Jana kit wont be needed. Unless you want it, but at what point is a built 44 going to cost compared to a 60 that can take a 37-38" tire with little effort. And dont say ground clearance plenty run 37's and 38's on a 60 front.

If its a long term build then search around and listen to others that have done it. Dont jump on the first HP 44 and then think hey lets build a super axle out of it, yes it can be done but at a bigger cost than a OEM axle that can take it, like a 60.

Jason.
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Unread 01-06-2013, 07:56 AM   #11
CZDiesel
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I agree, with a good ring and pinion set (American made) a standard high pinion should be fine with 37s.
I was just talking to Dan at Dyna Trac two days ago about the same subject and they feel strong enough about hp44s that they both recommend and warrenty them for 37s. Dan also said he knows of a bunch of JK owners running 40s with their extreme duty Pro Rock 44 and have not had any return for breakage. So the strength is there if built right with the right components.
If your planning on 37s the 44 gears will do but of your planning on larger or just want the comfort of knowing you ha e a stronger axle then run the jana kit.... it really doesnt cost that much more. Like Jason said though if your looking at eventually running larger than the 38-40 range you really need to be looking at 60s or 9s.
Either way post your build
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Unread 01-06-2013, 09:36 AM   #12
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I'm putting together a '78 f250 44 right now.

I'm using the Yukon zip locker w/4.88's.
I paid $400 for the complete axle, brake to brake, delivered.
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Unread 01-06-2013, 10:07 AM   #13
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I understand that the 44 8.5" ring gear will hold 37. Ive seen them hold 40's with 5.13's. However over time the ring gears started developing hairline cracks on most the teeth. Originally i was going to find and build a jk 44 (8.9" ring gear) but locker choices left something to be desired. Not to mention how proud people are of them. Which brings me to this topic. Thru what i have found i will cost about $150 more to put in the dana 50 gear set and have a 9" ring gear in the 44. Hopefully with the larger ring gear it will handle shock loads better than the 8.5 ring gear.
I would rather start with a 60 but the market price around here is $1200. I can get the 44 and a 70 for nothing out of pocket. Which is the main reason for starting with a 44. I dont foresee going and bigger than a 38 in either the jk or wj.
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Unread 01-06-2013, 09:49 PM   #14
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I run a high pinion 30 with 30-spline 1.31 Superior inner shafts and D44 knuckles with 19-spline 1.16 Superior outers with 760 joints.

All of which is smaller stuff than you're talking about building except the outers which are the same size you'll be stuck with. I have broken both the stub and the Warn Premium hub on 35" tires and have not broken an inner shaft or the r&p.

That should be all you need to know to skip the 44 if you want something for larger than 35" tires.
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Unread 01-06-2013, 10:32 PM   #15
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in my jk hp 30 i had 4.88 gears 27 spline chromo shafts good joints never broke a shaft or good joint. just shelled a lot of teeth off of the ring gear. this was with open diff. i dont see how i will be stuck with a 19 spline outer. i know i can get a 30 spline outer with the rcv's and a set of drive slugs or warn premium lockouts.
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