engine

Transmission Mount

for 2017 Toyota Corolla 1.8L I4 · FWD

Difficulty

Moderate

Time

1.0 h

Tools

Steps

This procedure covers the replacement of the transmission mount on a 2014-2019 Toyota Corolla with the 1.8L I4 engine, which supports the transmission and reduces vibration transfer to the chassis.

Warnings

⚠️Never work under a vehicle supported only by a floor jack. Always use jack stands rated for the vehicle weight.

⚠️Ensure the transmission is properly supported before removing mount bolts to prevent sudden movement or transmission drop.

⚠Do not allow the transmission to hang unsupported as this can damage the driveshafts, shift cables, and wiring harnesses.

Tools required

Floor jackEssential

Jack standsEssential

Transmission jack or engine support fixtureEssential

Torque wrench (10-100 Nm range)Essential

Socket set (10mm-19mm)Essential

Ratchet and extensionsEssential

Pry bar

Wire brush

Penetrating oil

Parts

Transmission mount assembly × 1 — Use OEM specification

Preparation

Park vehicle on a level surface and engage parking brake
Chock the rear wheels securely
Raise the front of the vehicle and support on jack stands at the manufacturer-specified lift points
Remove any plastic undercovers that obstruct access to the transmission mount area
Inspect the transmission mount location and identify all mounting points before beginning removal

Procedure

1
Support the transmission
Position a transmission jack or floor jack with a block of wood under the transmission oil pan. Raise the jack until it just barely makes contact and supports the transmission weight without lifting it. This prevents the transmission from dropping when the mount is removed.
2
Remove transmission mount to crossmember bolts
Locate the bolts securing the transmission mount to the crossmember (typically 2-3 bolts on the bottom side of the mount). Use a socket and ratchet to remove these bolts completely. Keep track of any washers or spacers.
Torque spec
Transmission Mount Bolts65 Nm (48 lb-ft)
3
Remove transmission mount to transmission bracket bolts
Locate the bolts securing the top of the transmission mount to the transmission bracket (typically 3-4 bolts). Remove these bolts using a socket and extension if needed for access. The mount should now be free to remove.
Torque spec
Transmission Mount Bolts65 Nm (48 lb-ft)
4
Remove the transmission mount
Lower the transmission jack slightly (approximately 1-2 inches) to create clearance. Remove the transmission mount assembly from between the transmission and crossmember. Inspect the old mount for cracking, tearing, or separation of the rubber from the metal components.
5
Clean mounting surfaces
Use a wire brush to clean the mounting surfaces on both the transmission bracket and crossmember. Remove any corrosion, dirt, or old rubber residue. Apply penetrating oil to the bolt threads in the crossmember and transmission bracket, then wipe clean.
6
Position the new transmission mount
Position the new transmission mount between the transmission bracket and crossmember. Raise the transmission jack slightly to align the mount with the bolt holes. Ensure the mount is oriented correctly with any directional markings or offset positioning matching the original.
7
Install transmission mount to transmission bracket bolts
Thread in the bolts securing the mount to the transmission bracket by hand first to ensure proper alignment. Tighten the bolts in a cross pattern to the specified torque specification using a torque wrench.
Torque spec
Transmission Mount Bolts65 Nm (48 lb-ft)
8
Install transmission mount to crossmember bolts
Install the bolts securing the bottom of the transmission mount to the crossmember. Hand-tighten first, then torque to specification in a cross pattern. Ensure all washers and spacers are reinstalled in their original positions.
Torque spec
Transmission Mount Bolts65 Nm (48 lb-ft)
9
Remove transmission support and verify clearances
Carefully lower and remove the transmission jack. Visually inspect that the transmission sits properly on the new mount with no binding or interference. Check that all nearby components (shift cables, wiring, exhaust) have proper clearance and are not under tension.

Reassembly

Reinstall any plastic undercovers or shields that were removed during access
Lower the vehicle from jack stands
Remove wheel chocks

Verification

Start the engine and verify there are no abnormal vibrations or noises from the transmission area
With the engine running, shift through all transmission gears (P-R-N-D) and verify smooth operation with no excessive movement
Test drive the vehicle and confirm reduced vibration levels during acceleration and deceleration
Re-inspect all mount bolts for proper torque after the first 50-100 miles of operation