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Author Topic:   rear leaf spring shackles
Dirt Full Roller

Total posts: 55
posted December 05, 2001 08:10 AM
I have a '79 camaro. I'm putting in new adjustable rear leaf spring shackles.
In my old stock shackles, there is a square headed bolt that is used to bolt
the shackles to the frame and leaf spring. The bolt recesses into the
shackle and kind of locks the bolt in. It seems that the square headed
bolt is used to lock the shackle at a specific position.

The new adjustable shackles will only accpet a round head bolt.
They do not have a square head lock type recess in the shackle.

Do I just replace the square headed bolt with a round headed bolt
or do I need to get different shackles that have a recesses square
in the shackle?

It seems that if I don't use a square headed recess, the springs would be able
to move more freely forward and backward.

Dirt Maniac

Total posts: 174
posted December 05, 2001 12:36 PM
The bolt with the square was used so that it wouldn't turn as you tightened the nut on the other end. Don't worry about discarding the old bolts and using new, round grade 8 bolts. When I ran leaf springs, I made it a habbit to coat the bolts with antisieze or grease and tightened the nut to where there was no deflection in the shackles, but not so snug that they binded. Use another jamb nut to maintain that tension without the fear of loosening up. This let's the shackle move freely, so it has as little influence on spring rate as possible.

Another cool trick that really worked for us on leaf springs was to separate all the individual leaves and coat them with grease and wrap the greased and assembled stack with duct tape the entire length. We were pretty fast in my old camaro with leaf springs and shackles; don't let people tell you that they don't work.

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