Hello everyone. After reading the recent thread about rear shackles failing, it made me concerned about the rear shackles I plan to install on my Centerdoor. I recently purchased the set below, which shows the knurling on the shaft at the buckle.
Is this the style that everyone considers unsafe to use?
Yes, that is the type that can "come from together" !
And, Chaffin's is the source for the only "correct" as in original style of shackle.
Not exactly the same, but a similar pressed-together design. http://www.mtfca.com/discus/messages/331880/401615.html?1384559326
These came from Chaffins, but were made by Bob's.
Any other thoughts before these are tossed?
If the problem is with the knurled joint working loose, couldn't you just weld that joint?
I have some like that that are completely screwed. All the ends have come loose where the knurled part is pressed in. A bad design, not safe in my opinion.
Why would anyone consider such a shackle? There are good used genuine Ford parts at swap meets, and on ebay. NOS shackles show up from time to time too. For the sake of originality, why not be patient, and do it correctly. You failed to mention the year of you centerdoor, but I believe they changed the design of those shackles at least twice during the period centerdoors were being made.
I would rather use Chaffins figure 8 shackles than those. The figure 8's may not be correct, but at least they will be safe.
That said, it is not difficult to rebuild originals if you have a welder and a lathe. A while back Steve Jelf and I both posted our methods to do this.
Hope this helps.
Allan from down under.
I haven't had any experience with that style of shackle (FORTUNATELY!!!!), but stuff like this just sticks in my craw. Why is it so hard to make a part that works, it doesn't even have to be correct, just make it so that it works! Of course the correct parts would be better, but at least make the replacement parts functional! I don't get it. Some vendors have even been made aware of problems, but they don't seem to work with their suppliers to fix things that are wrong. That being said, NOT all vendors fall into this category. Kudos to those that do try to find solutions to the problems. I am in the camp that tries to make them aware of a problem, not as a complaint, but as a heads up. To my way of thinking, if they do realize that there is a problem, and it doesn't get fixed, that's on them. JMHO Dave
What`s so bad about this type of shackles. I understand is not like the originals, but to me they looks safe. The OD of the bolt head is larger than the hole and can't come loose. The knurling is just to hold the bolt and preventing it from tuning. Maybe I am missing something ?
It's just a press fit, there are forces on the shackles with tend to twist them, and the press fit doesn't have enough strength to resist them. If the bolt were welded to the plate, full penetration weld all around, then it would be fine. Some shackles were made that way, back 'in the day.'
Rolf, look at Steve Jelf's post on Feb. 24 at 10:55. Pretty well sums it up. Dave
OK. I see that. Not good. Thanks.