Complete replacement of all engine and transmission mounts on the 2014-2018 Chevrolet Silverado 1500 with 5.3L V8 EcoTec3 engine, including left and right engine mounts and transmission mount.

Warnings

Tools required

Parts

• Left engine mount assembly × 1 — GM 23475773 or equivalent
• Right engine mount assembly × 1 — GM 23475774 or equivalent
• Transmission mount assembly × 1 — GM 15865856 or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind rear wheels
3. Disconnect negative battery cable
4. Allow engine to cool completely if recently operated
5. Raise front of vehicle and support securely on jack stands at frame rails
6. Remove engine under-shield/skid plate if equipped
7. Spray all mount bolts with penetrating oil and allow to soak

Procedure

1. 1

   Install engine support system
   Position engine support fixture across engine bay or attach engine hoist to engine lifting points. Apply slight upward tension to support engine weight but do not lift engine yet. Ensure support is stable and secure before proceeding.
2. 2

   Remove right engine mount (passenger side)
   Working from underneath, locate the right engine mount at the front of the engine block. Remove the mount through-bolt connecting the mount to the engine bracket. Remove the two mount-to-frame bolts securing the mount to the frame rail. Carefully raise engine slightly with support system if needed to relieve tension on mount. Remove mount from vehicle.
   Torque spec

   Through-Bolt85 Nm (63 lb-ft)

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
3. 3

   Remove left engine mount (driver side)
   Locate the left engine mount at the front of the engine block on driver side. Remove the mount through-bolt connecting the mount to the engine bracket. Remove the two mount-to-frame bolts securing the mount to the frame rail. Use engine support to adjust engine position as needed to access bolts. Remove mount from vehicle.
   Torque spec

   Through-Bolt85 Nm (63 lb-ft)

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
4. 4

   Access transmission mount
   Position transmission jack under transmission pan with wood block to protect pan. Apply slight upward pressure to support transmission weight. Locate transmission mount crossmember underneath vehicle between transmission and rear axle.
   ⚠Use wood block between jack and transmission pan to prevent damage to pan.
5. 5

   Remove transmission mount
   Remove the transmission mount bolts connecting the transmission to the mount. Remove the mount-to-frame bolts securing the crossmember to the frame rails. Carefully lower transmission jack slightly to create clearance. Remove the transmission mount and crossmember assembly from vehicle.
   Torque spec

   Transmission Mount Bolts65 Nm (48 lb-ft)

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
6. 6

   Inspect mounting locations
   Thoroughly inspect all mounting locations on engine block, transmission, and frame rails for damage, corrosion, or cracks. Clean all mounting surfaces with wire brush. Check engine and transmission mounting brackets for cracks or damage. Replace any damaged brackets before installing new mounts.
7. 7

   Install new right engine mount
   Position new right engine mount onto frame rail. Start mount-to-frame bolts but do not fully tighten. Use engine support to align engine bracket with mount. Install mount through-bolt and tighten to specification. Then tighten mount-to-frame bolts to specification.
   Torque spec

   Through-Bolt85 Nm (63 lb-ft)

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
8. 8

   Install new left engine mount
   Position new left engine mount onto frame rail. Start mount-to-frame bolts but do not fully tighten. Adjust engine position with support system to align engine bracket with mount. Install mount through-bolt and tighten to specification. Then tighten mount-to-frame bolts to specification.
   Torque spec

   Through-Bolt85 Nm (63 lb-ft)

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
9. 9

   Install new transmission mount
   Position new transmission mount and crossmember assembly onto frame rails. Start mount-to-frame bolts but do not fully tighten. Use transmission jack to align transmission with mount. Install transmission mount bolts and tighten to specification. Then tighten mount-to-frame bolts to specification.
   Torque spec

   Transmission Mount Bolts65 Nm (48 lb-ft)

   Engine Mount-to-Frame Bolts75 Nm (55 lb-ft)
10. 10

    Final adjustments and verification
    With all mounts installed and torqued, verify engine sits level and centered in engine bay. Check clearances around engine to ensure nothing is contacting firewall, radiator, or accessories. Carefully remove engine support system and transmission jack. Rock engine gently by hand to ensure all mounts are properly seated and secure.

Reassembly

1. Reinstall engine under-shield/skid plate if equipped
2. Lower vehicle from jack stands
3. Reconnect negative battery cable
4. Remove wheel chocks

Verification

• Start engine and observe for excessive engine movement or vibration
• Check that engine idles smoothly without abnormal movement
• Rev engine to approximately 2000 RPM and verify no contact between engine and chassis
• With engine running, shift transmission through all gears and verify smooth operation
• Test drive vehicle and verify no vibration, clunking, or abnormal noises during acceleration and deceleration
• Perform final visual inspection under vehicle to ensure all mounts are properly seated and all bolts are tight

More procedures for this vehicle