Garage Door Not Level

sounds like the high side has more spring tension than the low side. I'd just tighten/loosen cables as appropriate. If this is a really old door, the low side spring may be stretched in which case it might be easiest to replace them both.

nate

Hi, Is the door square? Then spring needs adjustment.

I think there have been severl threads about the perils of replacing springs oneself. Some make it sound easy but only if you do it right, and there are also different kinds of springs.

(My favorite is Princess SummerfallwinterSpring.)

Torsion or extension springs?

If torsion, you can adjust the cable on the high side by loosening the cable "spool" on the high end and spinning it about 1/6 of a turn with the door up, or tightening the opposite side. It would probably be better to do this with the door down, but you would have to un-tension and re-tension the torsion spring to do that, which most homeowners find a little scary.

JK

if the tracks are actually vertically plumb, then you probably just need to adjust one of the springs. But if it's 2" off, i'll bet your tracks are out of plumb.

You might want to double check the level of the door vs the level of the floor using the same standard. You may find that they both show level because your measurement tool is not accurate enough to measure the error. Since the door is likely 8 foot or wider, even a very small error in level will show up over those 8 foot.