LS400 Transmission Mount Replacement

Support transmission with jack
1. Jack up the front of the car and support it with axle stands. Position the jack under the transmission, place a piece of wood on top to spread the load and gently lift the transmission slightly above its resting position.

Remove 4 nuts
2. Remove these four nuts with a 12mm socket.

Remove 4 bolts
3. Remove the cross member by removing these four bolts with a 14mm socket. They're not all the same length so make a note of where they go.

Remove 4 bolts
4. Undo these four bolts with a 12mm socket to remove the old mount from the transmission.

5. Installation is the reverse of removal.

New mount
This is the new mount, part number 12371-50010.

Old mount
The old mount. Looks a bit squashed compared to the new one!