suspension
Coil Spring - Front
for 1970 AMC Rebel Machine 390ci V8 · RWD
Difficulty
Advanced
Time
3.5 h
Tools
12
Steps
15
This procedure covers removal and replacement of the front coil springs on a 1970 AMC Rebel Machine, including disassembly of the front suspension components necessary to access and safely compress the springs.
Warnings
⚠️Coil springs store tremendous energy. Improper compression or release can cause springs to violently eject, resulting in severe injury or death. Always use a quality coil spring compressor and verify secure engagement before loosening suspension components.
⚠️Never work under a vehicle supported only by a jack. Always use jack stands rated for the vehicle weight and placed on solid frame contact points.
⚠️The front suspension supports the entire weight of the engine and front end. Ensure all components are properly supported before removing fasteners.
⚠Many suspension fasteners on a 1970 vehicle may be severely corroded. Apply penetrating oil 24 hours before beginning work and be prepared for potential fastener breakage.
⚠AMC Rebel front suspension uses a ball joint design where the spring seat is on the lower control arm. The lower control arm will drop when the ball joint is separated unless properly supported.
Tools required
Floor jackEssential
Jack stands rated for vehicle weightEssential
Coil spring compressor toolEssential
1/2 inch drive socket set (standard)Essential
1/2 inch drive breaker barEssential
Torque wrench (0-150 ft-lb range)Essential
Large pry barEssential
Ball joint separator or pickle forkEssential
Wire brush
Penetrating oil
Dead blow hammer
Safety wire or mechanic's wire
Parts
- Front coil spring (left) × 1 — Use OEM specification or heavy-duty equivalent
- Front coil spring (right) × 1 — Use OEM specification or heavy-duty equivalent
- Upper control arm bumper (if deteriorated) × 2 — Check during disassembly
- Lower control arm pivot bushing (if deteriorated) × 2 — Check during disassembly
Preparation
- Park vehicle on level, solid ground and engage parking brake
- Chock rear wheels securely on both sides
- Loosen front wheel lug nuts while vehicle is still on ground
- Raise front of vehicle using floor jack at center of front crossmember
- Place jack stands under frame rails behind lower control arm mounts
- Remove both front wheels completely
- Spray all suspension fasteners with penetrating oil and allow to soak
- Verify adequate working clearance around both front suspension assemblies
Procedure
- 1Support lower control armPosition floor jack directly under the lower control arm ball joint area, raising just enough to take slight upward pressure on the lower control arm. This simulates the load normally carried by the spring and prevents the control arm from dropping suddenly. Verify jack is stable and centered.⚠️The jack must remain in place throughout spring removal. If the jack slips, the lower control arm will drop violently.
- 2Disconnect shock absorber lower mountLocate the lower shock absorber mounting bolt at the lower control arm. Remove the nut and bolt securing the shock absorber to the lower control arm. Pull shock absorber upward out of the way and secure with wire to prevent interference.
- 3Disconnect stabilizer bar linkIf equipped with front stabilizer bar, remove the link bolt and hardware connecting the stabilizer bar to the lower control arm on the side being serviced. Note orientation of washers and bushings for reassembly.
- 4Mark and disconnect steering linkageLocate the tie rod end connection at the steering knuckle. Remove the cotter pin and castle nut from the tie rod end stud. Use ball joint separator or pickle fork to separate the tie rod end from the steering knuckle. Mark the tie rod adjustment position with paint before separation to maintain approximate alignment.
- 5Separate upper ball jointRemove the cotter pin and castle nut from the upper ball joint stud at the steering knuckle. Use a ball joint separator or carefully applied pickle fork to break the taper fit between the upper ball joint stud and knuckle. The knuckle will now pivot on the lower ball joint only.⚠Pickle fork tools will damage ball joint boots. Use only if ball joints are being replaced.
- 6Lower control arm and access springSlowly and carefully lower the floor jack supporting the lower control arm. The lower control arm will pivot downward on its frame mounts. Lower until the coil spring is accessible and no longer under significant tension. The spring will remain captured between upper and lower spring seats but will be loose.⚠️Lower the jack very slowly and watch for binding. If any resistance is felt, stop and identify the cause before proceeding.
- 7Install spring compressorWith the spring relaxed, install coil spring compressor tool according to manufacturer instructions. Ensure compressor hooks engage at least 3 full coils and are positioned opposite each other (180 degrees apart). Tighten compressor evenly and alternately on both sides until spring is compressed enough to be handled safely.⚠️Verify compressor hooks are fully seated in coil grooves. Partial engagement can cause slippage and sudden spring release.
- 8Remove coil springWith spring safely compressed, maneuver it out from between the upper and lower spring seats. Note the orientation of the spring, position of any rubber isolators, and the relationship between spring ends and seat pockets. Remove spring compressor only when spring is clear of vehicle and in a safe location.
- 9Inspect spring seats and componentsClean and inspect both upper (on frame) and lower (on control arm) spring seats for damage, corrosion, or deformation. Inspect rubber spring isolators if equipped and replace if deteriorated. Check upper control arm bumper and lower control arm bushings for wear. This is the ideal time to replace worn suspension bushings or ball joints.
- 10Compress and install new springUsing coil spring compressor, compress new spring to approximately the same compressed length as the original spring was when removed. Position spring between upper and lower seats, ensuring proper orientation with spring end tags or pigtails seated correctly in seat pockets. Verify any rubber isolators are properly positioned.⚠️New springs may have different free height than worn originals. Ensure adequate compression before attempting installation.
- 11Raise lower control armPosition floor jack under lower control arm and slowly raise the control arm. Guide the spring into proper seating in both upper and lower pockets as you raise. Continue raising until the upper ball joint stud can be inserted through the steering knuckle hole. This requires precise alignment.⚠Watch for spring compressor interference as control arm rises. Spring must remain properly seated in both pockets.
- 12Connect upper ball jointWith lower control arm raised sufficiently, insert upper ball joint stud through steering knuckle. Install castle nut and tighten securely. Continue tightening until cotter pin hole aligns, then install new cotter pin and bend tabs. Do not back off nut to align cotter pin.
- 13Release spring compressorWith suspension assembled and upper ball joint secured, slowly and evenly release tension on spring compressor tool. Allow spring to expand into its working position between the seats. Once completely unloaded, remove spring compressor tool from between coils.⚠️Release compressor very slowly and watch for improper spring seating. If spring appears misaligned, recompress and reposition.
- 14Reconnect steering and stabilizer linkageReconnect tie rod end to steering knuckle, install castle nut, tighten securely, and install new cotter pin. Reconnect stabilizer bar link to lower control arm if equipped, ensuring bushings and washers are in correct order.
- 15Reconnect shock absorberPull shock absorber down and align with lower control arm mounting hole. Install lower shock bolt and nut, tightening securely. Repeat entire procedure for opposite side if replacing both springs.
Reassembly
- Install wheels and hand-tighten lug nuts in star pattern
- Lower vehicle from jack stands to ground using floor jack
- With vehicle weight on suspension, torque lug nuts to 75 ft-lb in star pattern
- Bounce front end several times to settle suspension into normal position
- All suspension fasteners should be torqued with vehicle weight on wheels (at normal ride height)
Verification
- Verify vehicle sits level front to back with proper ride height restored
- Check that springs are properly seated in both upper and lower pockets with no visible gaps
- Confirm all ball joint castle nuts have cotter pins properly installed
- Test steering for full lock-to-lock movement without binding or interference
- Road test vehicle at low speed and verify no unusual noises from front suspension
- Schedule professional front-end alignment immediately, as suspension geometry has been disturbed
- After 50-100 miles, recheck all suspension fastener torque values