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Old 01-13-2017, 05:24 PM   #1 (permalink)
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Published numbers for R&P strength?

Is there anyone who has published 'rated' input/output toque limitations or actual destructive tested strengths for ring and pinion sets for various axles and ratios?
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Old 01-15-2017, 03:13 AM   #2 (permalink)
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Seems like Carl Jantz built some monster machine for breaking diffs. Maybe testing ARBs vs Yukon? I can't find it on my phone, though.

I think his various Jana threads also have numbers for various size r&p.

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Eta, from Jantz:

Dana rates the 44 @ 3460 Ft-lbs maximum momentary output torque.
Dana rates the 50 @ 5000 Ft-lbs maximum momentary output torque.

Dana rates the 44 @ 3460 Ft-lbs maximum momentary output torque.
Although I could not get exact figures from Dana the pictures show that the JK44 gears are beefier than a D50 set and since Dana rates the 50 @ 5000 Ft-lbs maximum momentary output torque.

Dana rates the 60 @ 6000 Ft-lbs maximum momentary output torque. 35 spl HD.
Dana rates the 70 @ 8000 Ft-lbs maximum momentary output torque. Non HD.

The D80 is rated at 10,000 ft-lbs momentary output torque where as the D70 is 8,000 Ft-lbs
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Old 01-15-2017, 07:25 AM   #3 (permalink)
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Interested myself.
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Old 01-15-2017, 05:15 PM   #4 (permalink)
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Quote:
Originally Posted by Subybaja View Post
Seems like Carl Jantz built some monster machine for breaking diffs. Maybe testing ARBs vs Yukon? I can't find it on my phone, though.

I think his various Jana threads also have numbers for various size r&p.

Pirate4x4.Com : 4x4 and Off-Road Forum - View Profile: unRL

Eta, from Jantz:

Dana rates the 44 @ 3460 Ft-lbs maximum momentary output torque.
Dana rates the 50 @ 5000 Ft-lbs maximum momentary output torque.

Dana rates the 44 @ 3460 Ft-lbs maximum momentary output torque.
Although I could not get exact figures from Dana the pictures show that the JK44 gears are beefier than a D50 set and since Dana rates the 50 @ 5000 Ft-lbs maximum momentary output torque.

Dana rates the 60 @ 6000 Ft-lbs maximum momentary output torque. 35 spl HD.
Dana rates the 70 @ 8000 Ft-lbs maximum momentary output torque. Non HD.

The D80 is rated at 10,000 ft-lbs momentary output torque where as the D70 is 8,000 Ft-lbs
Thanks. That's something to go by. I'm curious if the D30 ratings can be found too? I will look on the Dana site... And does anyone know by what factor one would derate for being on the coast side vs the drive side? (I would assume all the Dana ratings are drive side application)
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Old 01-15-2017, 05:32 PM   #5 (permalink)
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Dana has an interesting picture book on failures of HD axles.

http://www2.dana.com/pdf/AXSM-0020.PDF
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Old 01-15-2017, 05:55 PM   #6 (permalink)
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Odd 'info' in this Dana flyer for crate axles http://www2.dana.com/pdf/X5302-DAG.pdf

It's by ring gear size, Input toque limit, GAWR, GVW, GCW

Dana 30 Front 7.30 1450 2800 5700 8000
Dana 44 Rear 8.90 1930 3570 5700 8500
Dana 44 Front 8.50 1930 3360 5700 8000
Dana 60 Rear 9.75 2400 5760 8200 17100
Dana 60 Front 10.10 2785 7350 16000 30000
Dana 70 Rear 10.50 2600 8580 9900 18000
Dana 70 Front 10.75 3450 8400 19500 26000
Dana 80 Rear 11.25 3000 10100 14000 30000

They rate the rear JK D44 for the same input torque as a regular (probably LP) D44. They also rate the front D60 for more than the rear, but it looks like it's a HP Stuperduty setup given the 10" ring gear. Likewise they have a front D70 with a bigger ring gear, is this the GM Kodiak/Topkick HP D70 front?

I'd also assume the D30/D44 applications are also with the 'new' JK style gears which are cut differently and supposedly stronger, real world usage seems to confirm this as they explode much less often than the old style ones.

Wish I could find something a little more official.
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Old 01-17-2017, 07:44 PM   #7 (permalink)
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Quote:
Originally Posted by DirtyComanche View Post
Odd 'info' in this Dana flyer for crate axles http://www2.dana.com/pdf/X5302-DAG.pdf

It's by ring gear size, Input toque limit, GAWR, GVW, GCW

Dana 44 Rear 8.90 1930 3570 5700 8500
Dana 60 Rear 9.75 2400 5760 8200 17100
Dana 70 Rear 10.50 2600 8580 9900 18000
Dana 80 Rear 11.25 3000 10100 14000 30000

Wish I could find something a little more official.
All that tells me is that I should stop looking for a E-series D70 and just buy one of the many E-series D60Us I've seen.

There's not much difference in input torque rating and the main disparity in weight ratings is in the axle weight, not vehicle or combined weight. This suggests that D60 can be driven almost as hard as long as you don't do it all the time and the housing can't take as much stuff being piled on top of it.

What would be really interesting would be seeing the ratings from Dana for the many different varieties of D44/60/70/80. Some things like pinion bearings size doesn't mean much for momentary input torque or GAWR but the difference in bearing life will greatly affect max continuous input torque (which has a huge effect on GVWR and GCWR)
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Old 01-17-2017, 08:40 PM   #8 (permalink)
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What would be really interesting would be seeing the ratings from Dana for the many different varieties of D44/60/70/80.
Yes, I would be really interested to know regarding older models. The stuff we normally use and find in a junkyard.

I'm also still curious if there is a rule of thumb, or an actual mathematical truth, to how much strength is lost running a gearset on the coast side VS the drive side.
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Old 01-17-2017, 09:02 PM   #9 (permalink)
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I'm also still curious if there is a rule of thumb, or an actual mathematical truth, to how much strength is lost running a gearset on the coast side VS the drive side.
Larger diameter gears, thinner gears, gears on spools and gears on inherently flimsy carrier designs will be more prone to flexing. It's hard to compare carriers across differentials since there's so many other variables Numerically higher gears are going to have a less flexible ring but the teeth are smaller and the pinion is significantly weaker. Independent of the ring gear, pinions with a 3rd bearing are going to suffer less strength loss when running a numerically high ratio or running in reverse.

I'd bet that something like a 9" or 14b with the 3rd pinion bearing and a load bolt on a Detroit (or some other high end aftermarket carrier) would have less ring gear flex in reverse than the same rear end without the load bolt running forward on a factory open carrier.

Maybe someone like @unRL can test this for us.
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