Topic: Spring Shackle Differences

[J_Speegle]

Are you talking about a 1/4" thickness of the steel?  ........

+1  Will measure a half a dozen or more originals here at home

[Bob Gaines]

Yes, thickness of the steel.    I have several known aftermarket ones, all shaped differently than this one, and all measure 1/4".   I'm anxious
to know what you find.  Thanks.

edit:  .226, measured with calipers, to be more precise.   .156 is the measurement of the NPD piece

1/4 thick is way too thick for assemblyline shackles. The service replacement shackles were a lot thicker then the assemblyline ones and even they were much less then 1/4 inch thick steel. My Calipers has dead batteries so I will have to rely on someone else until I get it functional .

[67gta289]

I measured some original C6 stamped parts - thickness ~0.158

[Bob Gaines]

I measured some original C6 stamped parts - thickness ~0.158

If that is how thick the C6 shackle is that should represent the assemblyline thickness. I never went by my calipers (which are off line at the moment )but visually. I have only seen the C6 shackle plate one thickness and it was the one representing a assemblyline version.

[67gta289]

Bob - agreed.  I have a few sets, known originals.  The NPD version appears to be correct from this perspective.

[gjz30075]

Good to know!   Thanks guys!

[J_Speegle]

I measured some original C6 stamped parts - thickness ~0.158

I got 0.17-0.18 for from the four I measured. All in the same neighborhood.

Just for comparison, visually and in measurement, the factory tie down brackets came in at about 1/4" thick and the rear leaf spring (long one) around 0.35-0.38

[kammertime]

Are the NPD 1/2" shackles fine or coarse thread ?

[67350#1242]

The NPD description says fine thread.

SHACKLE KIT, Leaf Spring, rear, 1/2 inch stud, fine threads, used on LH side of dual exhaust cars as a normal shackle was difficult to install in the tight space, Current information shows that these were not always used as intended and are not seen much beyond 1967, Zinc plates, zinc studs, fine thread, C6DZ-5630-B