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Old 09-12-2019, 12:59 PM   #85
h018871
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my parts guy said no change in torque spec for the coupler to transmission bolt/nut. the nut is to be thrown away every time, the bolt is reusable.
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Old 09-16-2019, 12:29 PM   #86
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Originally Posted by h018871 View Post
my parts guy said no change in torque spec for the coupler to transmission bolt/nut. the nut is to be thrown away every time, the bolt is reusable.
Nope, the bolt is 1 use only because it is torqued until it permanently yields (deforms in length). Nut can be reused as it is not torqued until it yields.
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Old 09-16-2019, 12:47 PM   #87
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Is the car modded? How much rwhp?

I made 760 rwhp on the stock trans, driveshaft, rear diff, axels, bolts, etc.

So something is wrong here...

Does ARP make bolts for this application? If so, I’d try them!


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Old 09-18-2019, 07:22 AM   #88
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Quote:
Originally Posted by Stingr69 View Post
Nope, the bolt is 1 use only because it is torqued until it permanently yields (deforms in length). Nut can be reused as it is not torqued until it yields.
Nope, from service manual, "DO NOT reuse the nuts (1). Discard and replace with NEW only." see attached
My speculation here: the nuts are locking style, so once used they are deformed and do not lock as well if reused.
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Old 09-18-2019, 08:29 AM   #89
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It says discard the bolts and nuts. I've resused mine. Maybe I'll replace them later. Lol
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Old 09-18-2019, 08:39 AM   #90
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Quote:
Originally Posted by h018871 View Post
Nope, from service manual, "DO NOT reuse the nuts (1). Discard and replace with NEW only." see attached
My speculation here: the nuts are locking style, so once used they are deformed and do not lock as well if reused.
Yep. Bolts AND nuts are one use only.

LONG TERM UPDATE: the newer improved GM bolts I installed years ago are still holding up to all the hard use I have given them.

I actually have never reused ANY of the fasteners as they usually flew off on to the road when they failed.
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Old 09-18-2019, 05:50 PM   #91
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Look at last picture
Discard nuts, remove bolts and nuts
This description goes with diagram in 3rd picture pertaining to coupler to transmission output flange attachment.
All bolts/nuts must be replaced except the bolts attaching coupler to trans. Those can be replaced, but don’t have to be
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Old 09-18-2019, 10:24 PM   #92
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Quote:
Originally Posted by Stingr69 View Post
LONG TERM UPDATE: the newer improved GM bolts I installed years ago are still holding up to all the hard use I have given them.

What's the part number of these new improved bolts and where did you use them? There are three different types of bolts/locations.
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Old 09-18-2019, 10:32 PM   #93
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What a coincidence. I’ve been putting off an aluminum drive shaft and this gets bumped. Scared straight..pun intended. Ordered today!
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Old 09-20-2019, 10:23 AM   #94
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What's the part number of these new improved bolts and where did you use them? There are three different types of bolts/locations.
You really cant buy the old ones. The parts guy will give you the newer (revised) ones when you order them. They look slightly different.
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