Can anyone give me the length of stock front shackles

[excessiveego]

Ive searched and cant find the answer. I need to know the bolt hole center to center measurement on the stock front leaf spring shackles. The blazer I recently got has "custom" front shackles and no shim under the springs, so I need to calculate what I need for a shim. Thanks in advance.

 

[dhcomp]

What year blazer?

In 88, they got a little longer to try and avoid hitting the frame so often.

I can measure mine, my upgraded ORD ones are the same length as the 91 stockers.

 

[dremu]

Seems to me that you'd *measure*, not *calculate* shim angle. It'll change with how worn your springs are (and the springs themselves) as well as the shackles.

A $5 anglefinder from Harbor Freight or the local hardware store will do the trick.

Then you say "I want a caster angle of such-and-such, currently have a caster angle of so-and-so", and subtract the two to get your shim angle.

-- A

 

[excessiveego]

it's an 85

 

[excessiveego]

Seems to me that you'd *measure*, not *calculate* shim angle. It'll change with how worn your springs are (and the springs themselves) as well as the shackles.

A $5 anglefinder from Harbor Freight or the local hardware store will do the trick.

Then you say "I want a caster angle of such-and-such, currently have a caster angle of so-and-so", and subtract the two to get your shim angle.

-- A

can be calculated using trigonometry. Springs are the same length as stock, and new, so the longer shackles are the only thing really changing the angle.

 

[Kay86K5]

Ive searched and cant find the answer. I need to know the bolt hole center to center measurement on the stock front leaf spring shackles. The blazer I recently got has "custom" front shackles and no shim under the springs, so I need to calculate what I need for a shim. Thanks in advance.

just about all stockers are 4" long, center to center using a 7/16 bolt

 

[dremu]

can be calculated using trigonometry. Springs are the same length as stock, and new, so the longer shackles are the only thing really changing the angle.

Well, there's the weight on the front axle, bumper, winch, etc. You'll prolly end up being close, but why not be dead on.

-- A