My old Craftsman/Chamberlain 1/2 horse chain drive broke an extension spring last week.

Installed two new springs + new pulleys.

I tested it and balance is fine; almost no effort to raise/lower this heavy (145 lb.) old wood door

However I'm concerned that while the door is fairly quiet going UP, during last 1/3 of going DOWN,

it makes lots of noise, and **overhead track bows downward***.

This is a 2 car garage; 2nd door has similar chain-drive opener & no problems.

I notice that when 2nd door is closed, there is a maybe a 45 degree angle on

the bar that goes from trolly "slider" to the door, while on the "noisy" door,

that angle can't be more than 10-15 degrees.

Can this be where problem is?

Should I adjust travel of the slider on the trolly

(slider has 3 positions -holes- available,

currently set in hole closest to door, that provides least angle)

There are a lot of badly installed fixes and "upgrades" in this house,

--not me, from previous owner, I only do best work, and never ever make mistakes, ROTFL--

so would not be surprised that this c.1985 installation was ....junk.

.