4WD Front Springs

[jec]

Does anyone know the factory dimension between the front spring pivot bolt and centerline of the upper shackle pivot point at the rear of the spring. This is the center of the frame mounted cast iron bracket that the upper shackle bolt goes through.

My truck (1972 Cheyenne 30) was converted to 4WD and I think the mounting point is about one (1) inch to far forward. The angle of the shackle appears to be a little extreme. The shackle sits at about a 45 degree angle.

Thanks in advance to anyone with an original 4WD willing to take an actual measurement.

[Stocker]

Too late tonight, but if this isn't answered tomorrow, I'll take a look.

[Stocker]

It measures 43 3/4". Hope this helps!

[jec]

Thanks "Stocker". Mine measures 42 3/4".

[Stocker]

No problem. FWIW, my shackles are virtually vertical.

[jec]

After checking the mounting distance a second time, I came up with 41 3/4" on my truck. This is 2" shorter than original. The spring measures 43 3/4" with the truck sitting on the ground. Thanks again Stocker, this explains the fact that your shackle is straight up and down.

With all this having been said, I have began the process of moving the brackets to the proper factory location. The cast iron brackets do have a GM part # on them and I would be happy to forward this along to anyone interested.

Does anyone know the diameter of the hole through the frame where the bracket mounts?

The O.D. of the cast iron piece is slightly tapered and just over 1 1/2". I sort of remember seeing about 1/16" clearance around the the piece on original trucks.