I am planning on adding 3/4 rear spring spacers to level out my unlimited when loaded down. I have the OME medium rears (618 if memory serves) and 2 inch FT bumpstop extensions.

Is there a possibility of over compressing my rear springs with the spacers?

 

If I'm not mistaken, a space will just move your spring down. It doesn't compress it. If your shock is max'ed out, then yes, your spring will possibly be compressed but if our shock is max'd out, you have other problems.

 

The answer to your question is no, the weight of the vehicle is what compresses the spring, the added weight of a spacer (few ounces) will not have any effect, all it will do is lift your body farther off the spring.

 

I have to disagree - sort of.
With enough weight I can compress a spring to the bump stop. If a spacer is added to that spring, and you compress to the bump stop, the spring will compress the additional height of that spacer. There should be no argument to this point.

What I am asking, if this situation (compress to bump stop with additional spacer) takes place, will that extra compression damage the spring?

 

Adding spacers on the springs will not further compressed the springs, just added lift height of the vehicle. The spacers don't weight more than 2lbs. Which means adding spacers will not damage the springs.

But you can add bump stop extensions if you don't feel comfortable of the idea that now springs are more compressed then before adding the 3/4" spacers.

 

Assertion 1:
If an empty JK has 6 inches of space between the frame and bumpstop, and I add xxx tons of weight to contact the frame to the bumpstop, the spring has compressed 6 inches.

Assertion 2:
If I repeat this experiment with a 1 inch spacer between the top of the spring and the frame the spring will compress 7 inches.

Question:
If were to continue this process adding an inch at a time, at what point does the length of the spacer start to over compress the spring?

 

After the 3/4" spacers are installed so the springs have to compressed additional 3/4" before the bump stops come to contact.


Spacers will not over compressed the springs, only the weights you have added to you vehicle will compress the springs. OR something within your suspension is limiting your added lift and which cause to compress the springs.

And when you are adding spacers to a vehicle that the weight loads will be constantly changing, then must double check and be sure that your shocks have enough travels.

 

You need to add a longer bump stop or a spacer to the bump stop pad.

 

i always failed these questions in Algebra.

the train is three hours late, and the car is green.

 

Just buy some bilsteins and forget about bump stops.