I need to replace the left (driver side) lower rear control arm. Do I R&R the control arm without jacking, with the weight on the wheel, or weight off?

 

What year Monte? If you are talking '00-'07, you will definitely need to have the car raised, wheel off (or else the wheel will be in your way big time). The arm is held in by two bolts on the subframe and a nut at the steering knuckle.

The only repair I believe you might be able to do with the arm on the car is replacing the ball joint (but even that is a pain).

Before diving in, you may want to price a replacement arm (brand new, fully loaded). RockAuto.com is a good place to look.

For other years of Monte, I am betting you'll need the car raised and the wheel off (I'm not aware of any front control arm that can be done with the car on the ground and the arm still in the car).

 

Very sorry, forgot to add that it's a 98

 

I'm pretty certain the '98 is very similar to most GM FWD cars. Best way to tell, get on the ground and take a peak.