closed knuckle dana 44
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closed knuckle dana 44
I have a 66 Powerwagon with a Dana 44 front diff. About 2 weeks ago, the six "grade 8 bolts" that hold the spindle,backing plate to the steering knuckle on the drivers side had failed right after I hit the brakes to make a stop. Has that ever happened to anyone out here????
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Re: closed knuckle dana 44
Bet that woke u up!
- WD
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Re: closed knuckle dana 44
Potential high shear load bolts should be grade 5. Less likely to snap. Grade 8 is harder, but more brittle.
If I didn't build it, it ain't mine.
1949 Dodge B1B-108; 1969 D100-128; 72 Super Beetle; and a bunch of others...
1949 Dodge B1B-108; 1969 D100-128; 72 Super Beetle; and a bunch of others...
Re: closed knuckle dana 44
There is no shear load on these bolts, as there is a shoulder on the spindle that fits tightly into the knuckle bore.
I sold all of my sweptline trucks,except the invisible one. I just couldn't stand to see it go!
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- Wildergarten
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Re: closed knuckle dana 44
I would assume that a brake would transmit angular shear through the bolts into the knuckle.
'69 W200 (thumbnail)
'68 W200 (RIP)
'68 W200 383 NP435 3.53
'67 W200 383 NP435 4.10 w overload springs, Dana 60, PTO winch & flatbed dump, racks, crane, c-air (Max)
Mark Vande Pol
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'68 W200 (RIP)
'68 W200 383 NP435 3.53
'67 W200 383 NP435 4.10 w overload springs, Dana 60, PTO winch & flatbed dump, racks, crane, c-air (Max)
Mark Vande Pol
Wildergarten.org
Re: closed knuckle dana 44
Ok,shear,I'll go with that.Wildergarten wrote: ↑Mon Sep 30, 2019 11:44 pmI would assume that a brake would transmit angular shear through the bolts into the knuckle.
I sold all of my sweptline trucks,except the invisible one. I just couldn't stand to see it go!
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91w350 CTD
93w250 CTD
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Re: closed knuckle dana 44
How do you know they were grade 8? Is this a known fail? Seems like a lot from just hard braking.
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Re: closed knuckle dana 44
They had the markings of a factory grade 8 bolts
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- WD
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Re: closed knuckle dana 44
Every big rig and farm tractor shop/mechanic I’ve ever dealt with. Every chassis building article/video, print-online-dvd.
High clamping load? 8
High shear load? 5
Are they right? Are they wrong?
The 230 I gave the column shift 3spd, bellhousing and clutch away from used all Grade 5. My 318/727 and 413/727 have grade 5 for the torque converter and crank flange. Grade 8 spindle bolts. Grade 5 motor mount bolts. Grade 8 bumper mount bolts.
D100 and M400 chassis.
High clamping load? 8
High shear load? 5
Are they right? Are they wrong?
The 230 I gave the column shift 3spd, bellhousing and clutch away from used all Grade 5. My 318/727 and 413/727 have grade 5 for the torque converter and crank flange. Grade 8 spindle bolts. Grade 5 motor mount bolts. Grade 8 bumper mount bolts.
D100 and M400 chassis.
If I didn't build it, it ain't mine.
1949 Dodge B1B-108; 1969 D100-128; 72 Super Beetle; and a bunch of others...
1949 Dodge B1B-108; 1969 D100-128; 72 Super Beetle; and a bunch of others...
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Re: closed knuckle dana 44
Rev the engine, sidestep the clutch and lay rubber for miles - the shear on those flywheel bolts is out of this world! In comparison, shear on the knuckle bolt is jack *#%^!
Re: closed knuckle dana 44
Thanks for shearing.PwrWgnDrvr wrote: ↑Wed Oct 02, 2019 9:40 amRev the engine, sidestep the clutch and lay rubber for miles - the shear on those flywheel bolts is out of this world! In comparison, shear on the knuckle bolt is jack *#%^!
John
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Re: closed knuckle dana 44
According to the science here, they're wrong:WD wrote: ↑Wed Oct 02, 2019 5:32 amEvery big rig and farm tractor shop/mechanic I’ve ever dealt with. Every chassis building article/video, print-online-dvd.
High clamping load? 8
High shear load? 5
Are they right? Are they wrong?
The 230 I gave the column shift 3spd, bellhousing and clutch away from used all Grade 5. My 318/727 and 413/727 have grade 5 for the torque converter and crank flange. Grade 8 spindle bolts. Grade 5 motor mount bolts. Grade 8 bumper mount bolts.
http://rtstools.com/are-grade-8-bolts-m ... -9-metric/
One common misconception about bolts is that a higher rated bolt is stronger, yet more brittle, and therefore lower grades should be used in places like in suspension systems so they can deform rather then break. This is wrong!
Its often in the shear aspect that people assume lower grade bolts are better in places like suspension systems.
However, as you can see in the following table, both tension and shear are higher in Grade 8 bolts over Grade 5 bolts; in fact over 21% higher in shear and 25% in tension.
To be fair, the higher the grade of bolt, the harder it becomes as rated by the rockwell scale.
Therefore, technically a Grade 5 bolt is softer, and therefore spends more time deforming before failure. This time and area of deformation is called the plastic range.
However, as you can see by this graph, even though the Grade 8 bolt spends much less time in its plastic range, it doesn’t even get into the plastic range until it experiences over 21% more force. This same 21% of force, would have elongated and sheared the Grade 5 bolt.
So to use a lower grade bolt for the the purposes of it bending versus breaking, unfortunately that is incorrect. The lower grade bolt will reach its maximum elongation and reach its fracture point well before the higher grade even begins deforming.
Re: closed knuckle dana 44
I have a feeling that they were not torqued right last time someone had the knuckle apart. i have seen that happen on many old jeeps but never on any dodge 4x4
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Re: closed knuckle dana 44
Thank you all very much for your input. I still think that after 53 years of rotational stress from the brakes and the vertical stress these bolts endured, they just gave it up and snapped.
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Re: closed knuckle dana 44
Anyways I replaced those shoulder bolts on the passenger side as well as the drivers side along with the brake hoses. Well, that's one for you guys with the closed knuckle dana 44.