They are not welded on a 1999 LHS, there are two bolts that need to removed on the steering side I think it a 22 mm bolt. Each bolt has two metal tabs bent over top of them which need bent away from the bolts first. Once you have removed the outer tie rods, you may need a tie rod puller to remove the inner rods.
Inner tie rod
that part was made for more than one vehicle. the other holes are for different vehicles that part fits.
remove cotter pin from castle nut on outer tie rod end. loosen from threads enough to mark threads for replacement. pull and remove ball socket.. remove boot inner boot clamp from inner tire rod rod. unbolt tie rod using special tool supplied by auto parts store. thread in inner tie rod end. reinstall boot using plastic tie or adjustable clamp. reattach rod to outer tie rod end.
Inner Handle Rod Inner Handle Rod
on a steering rack the inner tie rod is threaded and will be the mount for the outer tie rod.
Tires,inner tie rod bushings, if the steering wheel shakes when brakes are applied - brake rotors warped.
buy a haynes or chiltons repair manual at parts store , shows you step for step replacement
Remove wheel and properly support vehicle. Remove outter tie rod from steering knuckle. Remove outter tie rod, count how many turns it takes to remove from inner tie rod. Remove inner tie rod boot. Use inner tie rod tool to remove inner tie rod. Install new inner tie rod (with inner tie rod tool) and do not overtighten. Properly install inner tie rod boot (you can use a zip tie on part that attaches to rack). Install outter tie rod and use the same amount of turns that you counted during removal (this will help with alignment). Install tie rod to steering knuckle and use a new cotter pin. Put wheel on and get an alignment.
you need a inner tie rod tool
The time it takes to replace a tie rod in a Buick varies with the age of the vehicle and whether this is an inner or outer tie rod. Estimated replacement time is 1 to 3 hours with a cost of about 230 dollars depending on the area and model.
not a real hard job, can b done in about an hour... must have the removal tool though, costs around $60
inner rod is usually part of rack unitreplace unitsome times the "inner" rod is bolted to the cylinder outputs of the rack unit where the dust boot is located.so just remove the bolt that holds the tie rod on to the rack.