What are the torque settings for bolts for the lower ball joint arm

Torque settings Working on your car means you have to torque parts up when you fit them. Using correct torque levels is very important. Bolts will be tensioned when torquing up. Always use a torque wrench when installing parts on your car!
Too much tension means the bolt will be stressed too much and can ultimately break.
Not enough tension means the bolt can either run loose or it can move around. This will damage the bolt and it's brackets. This can ultimately also lead to catastrophic failures.
Only use 8.8 grade bolts in suspension applications. (wishbones, dampers etc.) 10.9 grade or even worse 12.9 grade bolts are hardened.

The hardening process will improve the maximum possible load on the bolt, but it will also make the bolt relatively brittle.

Within suspension parts, you would rather see bolts bend than sheer. 8.8 grade bolts have the tendacy to bend, any hardended bolts have the tendacy to sheer.
Below is a guideline to the torque levels used on Metric bolts.
Bolt grades are printed on the head of the bolt.
Bolt Size 8.8 10.9 12.9 A2-70 (Stainless) 6mm (M6) 9Nm 13Nm 14Nm 7Nm 8mm (M8) 23Nm 33Nm 40Nm 17Nm 10mm (M10) 45Nm 65Nm 70Nm 33Nm 12mm (M12) 80Nm 115Nm 125Nm 57Nm 14mm (M14) 125Nm 180Nm 195Nm 16mm (M16) 195Nm 280Nm 290Nm Note than when fitting bolts into Ally threads like rivnuts, manifolds and S1 uprights then the torque may need to be reduced.

Special note for Mr. Wiki - This is the thread size, not the head size.
Engine mount torque settings (K-Series) Nm RH engine mounting bracket to engine RH engine mounting bracket to rubber mounting RH engine rubber mounting to chassis RH engine steady arm bolts LH engine mounting bracket to rubber mounting LH engine mounting bracket to engine Lower steady arm bracket to sump Lower steady arm bolts Use Permabond A130(A912E7033V) on the sump end bolt on the lower steady arm
Front suspension torque settings (S2 K-Series) Nm Upper and lower wishbone pivot bolts Upper swivel joint to steering arm Lower swivel joint to plinth Steering arm to hub carrier Track rod end to steering arm Damper to lower wishbone Damper to top anchor bracket Damper anchor bracket to chassis Hub bearing unit to hub carrier Brake caliper to hub carrier Anti-roll bar rubber bush mounting clamps Anti-roll bar drop links Rear suspension torque settings (S2 K-Series) Nm Upper and lower wishbone pivot bolts Upper and lower swivel joint ball pins Upper swivel joint plinth to hub carrier Toe-link outer ball joint to hub carrier* Toe-link inner ball joint/wishbone to sub frame** Toe link ball joint lock nuts Damper to lower wishbone Damper to chassis Upper brake caliper to hub carrier (M10) Lower brake caliper to hub carrier (M8) Hub bearing unit to hub carrier Rear hub nut ,*Check batch number of ball joint is 43273 or later
,**Check batch number of ball joint is 43725 or later

sorry but impala ball joints are not pressed in they are secured by rivets

to replace control arm, you need place jackstands under the frame and lower vechicle so the weight of the vechicle rests on the jackstands and not on the control arms, then remove the front wheel remove ball joint and nut, remove steering knuckle from the lower ball joint using tool KM 507 B. remove control arm to crossmember nut and bolt, remove rear crossmember to body bolt and remove control arm.torque control arm to crossmember nut and bolt 81 ft lbs, torque ball joint to steering knuckle bolt nut 44 ft lbs.torque crossmember to body bolt to 145 ft lbs.

SAFELY RAISE SUPPORT FRONT OF VECHICLE ON JACK STAND MAKE SURE VECHICLE PARKED ON SOLID LEVEL GROUND. REMOVE WHEEL OR TIRE. REMOVE BALL JOINT STUD PINCH BOLT AND NUT FROM THE STEERING KNUCKLE.REMOVE BALL JOINT BY PRYING IT FROM THE KNUCKLE.REMOVE BALL JOINT TO LOWER CONTROL ARM BOLT AND NUT. INSTALL NEW BALL JOINT TO LOWER CONTROL ARM.TORQUE THE BOLT TO 86 FT LBS INSTALL BALL JOINT TO THE STEERING KNUCKLE TORQUE BOLT TO 43 FT LBS YOU MORE LIKELY NEED FRONT END REALIGNMENT AFTER THE JOB DONE.

Lower ball joint specs:
Torque the ball joint-to-control arm nuts/bolts to 85 ft. lbs. (115 Nm). Torque the castellated nut to 108 ft. lbs. (147 Nm).

Upper ball joint specs:
Tighten the mounting bolts to 42 ft. lbs. (57 Nm) and the castellated nut to 72 ft. lbs. (96 Nm).

REMOVAL & INSTALLATION

1. Raise and safely support the vehicle, allowing the front suspension to hang free.
2. Remove the wheel and tire assembly. WARNING
   Be careful when working in the area of the CV-joint boot. Damage to the boot could result in eventual CV-joint failure. If necessary, install CV-joint boot protector tool J-34754 or equivalent, to protect the boot.
   
3. On Eldorado and Seville with 4.6L engine, remove the road sensing suspension position sensor from the lower control arm.
4. Remove the cotter pin and nut from the ball joint stud. Use ball joint separator tool J-36226 or equivalent, on Deville and Fleetwood or ball joint separator tool J-35315 or equivalent, on Eldorado and Seville, to separate the ball joint from the steering knuckle.
5. On Deville and Fleetwood, loosen the stabilizer bar link nut.
   1. Drill out the 3 rivets retaining the ball joint to the lower control arm and remove the ball joint. NOTE: Recommended drill-bit is 1⁄2 inch (13 mm). Fig. 1: Drilling the rivets out of the lower control arm
      Fig. 2: Installing the bolts in the lower control arm
      To install:
      
6. Attach the new ball joint to the lower control arm with 3 mounting bolts and nuts.
   1. On Deville and Fleetwood, the bolts must be installed from the top of the control arm.
   2. On Eldorado and Seville, the bolts must be installed from the bottom of the control arm
   3. Tighten the nuts to 50 ft. lbs. (68 Nm).
   4. On Catera, the bolts must be installed from the top of the control arm.
   5. Tighten the nuts to 26 ft. lbs. (35 Nm).
7. On Deville and Fleetwood, tighten the stabilizer bar link nut to 13 ft. lbs. (17 Nm).
8. Connect the ball joint to the steering knuckle and install the castellated nut.
9. On Deville and Fleetwood, tighten the ball joint nut to 88 inch lbs. (10 Nm). Then tighten the nut an additional 120°, during which a tighten of 41 ft. lbs. (55 Nm) must be obtained.
10. On Eldorado and Seville, tighten the ball joint nut to 84 inch lbs. (10 Nm). Then tighten the nut an additional 120°, during which a minimum torque of 37 ft. lbs. (50 Nm) must be obtained. If the minimum torque is not obtained, check for stripped threads. If the threads are okay, replace the ball joint and knuckle.
11. On Catera, tighten the pinch bolt to 74 ft. lb. (100 Nm).
12. Install a new cotter pin. If the cotter pin cannot be installed because the hole in the stud does not align with a nut castellation, tighten the nut up to an additional 60°to allow for installation. NEVER loosen the nut to provide for cotter pin installation.
13. On Eldorado and Seville with 4.6L engine, install the road sensing suspension position sensor to the lower control arm.
14. If necessary, remove the CV-joint boot protector tool.
15. Install the wheel and tire assembly and lower the vehicle. Fig. 3: Separating the ball joint from the steering knuckle
    Fig. 4: Lower ball joint installation - Deville and Fleetwood
    Fig. 5: Lower ball joint installation - Eldorado and Seville
    

It depends on exactly which ball joint of the 3 per side your changing, but here are the details.

COMPRESSION LOWER ARM & LATERAL LOWER ARM ASSEMBLIES
Removal
1. Loosen compression lower arm ball joint nut. Using steering linkage puller, separate ball joint and
knuckle. Remove nut, bolts and compression lower arm assembly. Remove dust cover.
2. Remove stay. Remove shock absorber lower mounting bolt. Loosen lateral lower arm ball
joint and knuckle nut. Using steering linkage puller, separate ball joint and knuckle. Remove nut, bolt and
lateral lower arm assembly. Remove dust cover.
Inspection
Using preload socket, ensure breakaway torque for compression lower arm ball joint is 4-22 INCH lbs. (0.5-2.5
N.m) for 2000 models. On 2001 models, breakaway torque is 22-54 INCH lbs. (2.5-6.1 N.m). Ensure
breakaway torque for compression lateral lower arm ball joint is 13 INCH lbs. (1.5 N.m). Check compression
lower arm, lateral lower arm, dust covers, and bushings for damage and wear.
Installation
To install, reverse removal procedure. Use NEW ball joint nuts. Lubricate lip and inside of dust cover with
multipurpose lubricant. Using installer, install dust cover. Check front wheel alignment.
UPPER ARM ASSEMBLY
Removal
Using steering linkage puller, loosen upper arm ball joint and knuckle nut. Remove self-locking nut. Remove upper arm and upper arm shaft assembly. Remove dust cover.
Inspection
Using preload socket, ensure breakaway torque for upper arm ball joint is 3-13 INCH lbs. (0.3-1.5 N.m).
Replace upper arm assembly when measured value exceeds specification. Check upper arm, dust cover, and
bushings for damage and wear.
Installation
1. To install, reverse removal procedure. Use NEW self-locking nuts. Lubricate lip and inside of dust cover
with multipurpose lubricant. Using Ball Joint Installer (MB990800), install dust cover.
2. Ensure upper arm shaft assembly is installed at indicated angle. Verify upper arm shaft
assembly installation. Check front wheel alignment.

Once you have the correct arm off and a replacement joint (if available, some are not serviceable and require the arm to be replaced) then you will need a press or a ball joint press to change the joint. Such as
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=38335

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=46389

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=66958

or http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=46967

Okay....here is the steps first....and then the directions on how to use the tools:

1. Raise and properly support the vehicle.
2. Remove the front wheel.
3. Detach the shock absorber lower mount by removing the two bolts.
4. Remove the retainer nut, retainer, cushion and shock absorber.
5. Detach the cushion retainer from the shock absorber.
6. Compress the coil spring with a commercially available spring compressor.
7. Detach the stabilizer bar.
8. Support the upper suspension arm and steering knuckle securely.
9. Remove the cotter pin.
10. Loosen and remove the nut.
11. Using a ball joint removal tool, detach the lower ball joint from the lower control arm.
12. Loosen the suspension arm set bolt.
13. Remove the suspension arm set bolt nut.
14. Remove the nut from the strut bar front set bolt.
15. Pull out both set bolts.
16. Remove the lower suspension arm and coil spring. To install:
    
17. Installation is the reverse of removal. Note the following torque specifications:
    1. Strut bar front set bolt: 221 ft. lbs. (300 Nm)
    2. Lower suspension arm set bolt: 148 ft. lbs. (200 Nm)
    3. Lower ball joint nut: 80 ft. lbs. (110 Nm)
    4. Lug nuts: 83 ft. lbs. (110 Nm).

Remove in this order: wheel, loosen the 4 lower ball joint set bolts, cotter pin and nut from tie rod, tie rod from ball joint bracket, ball joint from lower control arm, 4 lower ball joint set bolts, ball joint from suspension. Install is reverse but don't tighten the 4 lower ball joint set bolts.

torque is as follows:
ball joint to control arm- 112 ft-lbs
Tie rod nut- 67 ft-lbs
lower ball joint set bolts- 83 ft-lbs
remember to use a new cotter pin