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Driveshaft flange to differential torque?  Rate Topic 
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 Posted: 11-20-2023 06:18 pm
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JH12947
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I've searched around and checked the manuals, but haven't been able to find any spec for the differential flange to driveshaft  torque for the 4 attaching bolts on the 4-speed.  If anyone has it, let me know- Thanks,
Corey

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 Posted: 11-21-2023 01:13 am
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redracer
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Assuming the later, larger flanges that use the 3/8" X 24 threads/inch, standard torque would be 44 ft-lbs for a grade 5 bolt.
40 would probably be all as there is very little tension or compression of the bolts

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 Posted: 11-21-2023 01:45 am
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JH12947
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Thanks for the reply. The bolts are on a 1973 and are 5/16", if that makes a difference.

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 Posted: 11-21-2023 11:48 am
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redracer
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Sent a "private message" chart so you could print it:
https://m.media-amazon.com/images/I/81HOHszn-zS.jpg
The one I have used for years came from the back of a Snap-On catalog

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 Posted: 11-21-2023 07:36 pm
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DonBurns
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I think the drive shaft flanges use those compressed out of round lock nuts, don’t they? I’ve never worried about the torque on those.

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 Posted: 11-21-2023 08:09 pm
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redracer
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So, according to the torque chart for grade 5, fine pitch(24 threads/inch) for a 5/16" diameter bolt, that would be 22lbs-ft

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