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Leaf Spring Wear, Sag, and Noise

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The T1N Sprinter uses leaf springs at the rear and a transverse leaf spring at the front. Worn, broken, or fatigued springs cause ride height loss, noise, and handling problems — and are worth inspecting regularly, especially on high-mileage or heavily loaded vans.

Symptoms

  • The rear of the van sits noticeably lower than normal (spring sag) [0, 2]
  • Knocking, rattling, or squeaking noises from the rear suspension area [0, 4]
  • Rough or wallowing ride quality, especially over bumps [6, 9]
  • Uneven or excessive tire wear, possibly caused by incorrect spring/weight distribution [0, 4]
  • Erratic steering or vehicle instability linked to spring fatigue or failure [0, 4]
  • Front-end ride comfort loss due to worn or missing rubber end boots on the transverse leaf spring [9]
  • Loss of front ride height due to worn spring seat bushings or spring spacer blocks [1]

Causes

  • A broken leaf within the spring pack causes the spring to sag and lose load capacity [0, 2]
  • Spring fatigue over time — especially under heavy or uneven loading — causes permanent sag [0, 2]
  • Loose spring clamp bolts allow the leaves to shift and produce noise [0, 2]
  • Worn or deteriorated bushings at the spring eye or mounting brackets create noise and slop [0, 2]
  • Worn or missing spring tip inserts allow the leaf ends to contact each other noisily [0, 2]
  • Worn spring seat rubber bushings and spacer blocks (front transverse spring) lead to loss of ride height [1]
  • Worn or missing rubber end boots on the front transverse leaf spring degrade ride comfort [9]
  • Incorrect vehicle loading — weight shifted aft of the rear axle centerline — accelerates spring fatigue [0, 4]

Diagnosis

  • Visually inspect the rear leaf spring pack for broken or shifted leaves, loose or missing clamp clips, and broken center bolts — especially after off-road use [0, 2]
  • Check rear ride height side-to-side: a noticeably lower corner suggests a broken leaf or fatigued spring pack [0, 2]
  • Bounce each corner of the van and listen for knocking or creaking; knocking often points to loose mounting fasteners or worn bushings, while squeaking points to worn or missing spring tip inserts [0, 2]
  • Inspect spring eye and shackle bushings for cracking, deformation, or excessive play [0, 4]
  • Check that spring perches have not shifted position — shifted perches can also cause uneven tire wear [6]
  • On the front, inspect the transverse leaf spring rubber end boots where the spring contacts the lower control arm (wishbone); missing or torn boots indicate worn insulators that affect ride quality [9]
  • On high-mileage vans, inspect the front spring seat rubber bushing and spacer blocks for wear that results in reduced ride height [1]
  • Do NOT attempt to lubricate spring eye or shock bushings — grease and mineral oil-based lubricants will deteriorate the rubber [0, 4]

Repair

Rear leaf spring replacement involves raising and supporting the vehicle, removing U-bolts and spring brackets, and installing a new spring pack. Front transverse leaf spring service is more involved — requiring removal of wheels, brake calipers, upper strut mounts, and control arms — and is described as a full-day job for one person [9]. Bushing-type fasteners must be torqued with the vehicle at normal ride height and with the springs supporting vehicle weight; torquing at full droop will cause premature bushing wear and affect ride comfort [0, 4]. Most owners can handle rear spring replacement with basic tools; front spring service requires more skill and proper jack stands.

Read first

  • Always support the rear axle independently with a floor jack before removing spring mounting hardware — the axle will drop when the spring is disconnected [7]
  • Torque all rubber-bushing suspension fasteners only after the vehicle has been lowered to normal ride height and the springs are supporting vehicle weight; torquing at full droop causes premature bushing wear and ride comfort problems [0, 4]
  • Never lubricate spring eye or shock absorber bushings — grease and mineral oil-based lubricants will deteriorate the rubber [0, 4]
  • When servicing the front transverse leaf spring, the front end will be partially disassembled and the vehicle must be on stable jack stands throughout — be especially cautious about stability while working under the van [9]
  • Never attempt to modify suspension or steering components by heating or bending [5]

Tools

  • Floor jack and jack stands rated for vehicle weight
  • Socket set: 13, 16, 18, 19, 21, 24 mm sockets and spanners [9]
  • 7 mm Allen key (for brake calipers) [9]
  • 6 mm Allen bit (to prevent strut rotation at upper mount) [9]
  • Impact wrench (strongly recommended for upper strut mount nut) [9]
  • Torque wrench
  • Caliper hanger or wire hook
  • Brake caliper piston compressor [9]
  • Wheel chocks

Steps

  1. Raise and support the vehicle safely on jack stands; support the rear axle independently with a floor jack [7]
  2. For rear spring removal: remove the spring shackle bolts from the rear spring bracket, lower the axle slightly, and remove the shackle from the spring [7]
  3. Remove the U-bolts securing the spring plate to the rear axle — these require 170 N·m (125 ft. lbs.) on reinstallation [7, 8]
  4. Disconnect the spring from the front spring bracket and rear spring bracket [7]
  5. Install the new spring; attach the spring to the front spring bracket and torque to 95 N·m (70 ft. lbs.) for SRW or 185 N·m (136 ft. lbs.) for DRW [8]
  6. Attach the spring to the rear spring bracket and torque to 85 N·m (63 ft. lbs.) for SRW or 185 N·m (136 ft. lbs.) for DRW [8]
  7. Raise the rear axle and install the spring plate and U-bolts; torque U-bolts to 170 N·m (125 ft. lbs.) for both SRW and DRW [7, 8]
  8. Install the spring shackle to the spring and torque to 90 N·m (66 ft. lbs.); raise axle and attach shackle to rear spring bracket and torque to 85 N·m (63 ft. lbs.) for SRW or 185 N·m (136 ft. lbs.) for DRW [7, 8]
  9. IMPORTANT: Lower the vehicle to normal ride height and allow the springs to support vehicle weight before performing final torque on any rubber-bushing fasteners [0, 4]
  10. For front transverse leaf spring end boot/seat replacement: remove the front wheel, brake caliper (hang it — do not let it dangle by the hose), upper strut mount, and lower control arm (wishbone); inspect and replace rubber end boots and spring seat bushing as needed [9]
  11. Use torque specs from the WIS manual for all front suspension fasteners; an impact wrench is useful for the upper strut mount nut [9]

Torque specs

  • Rear spring to front spring bracket (SRW): 95 N·m (70 ft. lbs.) [8]
  • Rear spring to front spring bracket (DRW): 185 N·m (136 ft. lbs.) [7, 8]
  • Rear spring to rear spring bracket (SRW): 85 N·m (63 ft. lbs.) [8]
  • Rear spring to rear spring bracket (DRW): 185 N·m (136 ft. lbs.) [7, 8]
  • Spring shackle to rear spring bracket (SRW): 90 N·m (66 ft. lbs.) [8]
  • Spring shackle to rear spring bracket (DRW): 185 N·m (136 ft. lbs.) [8]
  • U-bolt to spring plate and axle (SRW & DRW): 170 N·m (125 ft. lbs.) [7, 8]

Parts

Plain part names — affiliate links and pricing are coming in a later update.

  • Rear leaf spring assembly (SRW or DRW, as applicable)
  • Spring eye bushings
  • Spring tip inserts
  • Spring shackle bushings
  • U-bolts (replace if deformed)
  • Front transverse leaf spring rubber end boots / spring tip insulators [9]
  • Front spring seat rubber bushing [1]
  • Front spring spacer blocks [1]

Related forum threads

From the manuals

  • Workshop manual (2000–2003)

    "This results in maximum vehicle handling stability and safety. Incorrect vehicle weight distribution can cause excessive tire tread wear, spring fatigue or failure, and erratic steering. CAUTION: Suspension components with rubber/urethane bushings (except stabilizer bar) should be tightened with the vehicle at normal ride height. It is important to have the springs supporting the weight of the vehicle when the fasteners are torqued. If springs are not at their normal ride position, vehicle ride comfort could be affected and premature bushing wear may occur. DIAGNOSIS AND TESTING - SPRING AND S"

  • Workshop manual (2004–2006)

    "The action throughout each stroke should be smooth and even. The spring eye and shock absorber bushings do not require any type of lubrication. Do not attempt to stop spring bushing noise by lubricating them. Grease and mineral oil-base lubricants will deteriorate the bushing rubber. If the vehicle is used for severe, off-road operation, the springs should be examined periodically. Check for broken and shifted leafs, loose and missing clips, and broken center bolts. Refer to Spring and Shock Absorber Diagnosis chart for additional information. VAREAR 2 - 11 SPRING AND SHOCK ABSORBER CONDITIONP"

  • Workshop manual (2004–2006)

    "Loose or damaged suspension components. 2. Inspect and repair suspension. 3. Internal gear noise.3. Replace steering gear. 4. Pressure hose in contact with other components. 4. Reposition hose. 5. Loose or damaged intermediate shaft or column. 5. Inspect and repair or replace. CHIRP OR SQUEAL1. Loose belt.1. Adjust or replace. WHINE OR GROWL1. Low fluid level.1. Fill to proper level. 2. Pressure hose in contact with other components. 2. Reposition hose. 3. Internal pump noise.3. Replace pump. 4. Air in fluid4. Check for lekas, Evacuate air from P/S system. SUCKING AIR SOUND1. Loose return line"

  • Workshop manual (2004–2006)

    "15 SPRING SHACKLE REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 15 STABILIZER BAR REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 15 STABILIZER LINK REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 16 REAR DESCRIPTION The rear suspension is comprised of: •Shock Absorbers •J ounce Bumpers •Stabilizer Bar •Leaf Springs •Drive Axle CAUTION: A vehic"

  • Workshop manual (2000–2003)

    "If springs are not at their normal ride position, vehicle ride comfort could be affected and premature bushing wear may occur. Wheel alignment involves the correct positioning of the wheels in relation to the vehicle. The positioning is accomplished through suspension and steering linkage adjustments. An alignment is considered essential for efficient steering, good directional stability and to minimize tire wear. The most important measurements of an alignment are caster, camber and toe (Fig. 1). CAUTION: Never attempt to modify suspension or steering components by heating or bending. DIAGNOS"

  • Workshop manual (2000–2003)

    "Tighten to 185 N·m (136 ft. lbs.). (2) Install the spring to the front spring bracket (Fig. 3). Tighten to 185 N·m (136 ft. lbs.). (3) Install the spring to the rear spring bracket (Fig. 3). Tighten to 185 N·m (136 ft. lbs.). (4) Raise the rear axle and attach the spring plate and U-bolts (Fig. 3). Tighten to 170 N·m (125 ft. lbs.). (5) Lower the vehicle. SPRING SHACKLE REMOVAL (1) Raise and support the vehicle. (2) Support the rear axle. (3) Remove both the rear spring shackles from the spring bracket. (4) Lower the rear axle and remove the rear spring shackle from the spring. INSTALLATION (1"

Sources

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