FJ Cruiser: Vibration that changes with vehicle speed, felt in the seat or floor

Checks, in order

1. Tires and balance
   Rule this out first by checking for flat spots, belt separation and a recent balance. A vibration that comes in at one speed range and goes away is classic tire or balance behavior.
   easy $ · under about $50
2. Driveshaft u-joints
   With the truck on stands, twist each driveshaft by hand at the joints. Any clunk, play or rust dust at a cap means replace the joint. Grease fittings, if present, should take grease.
   easy $ · under about $50
3. Driveshaft bolts and balance weights
   Check the flange bolts at the transfer case and differentials. Look for a missing balance weight (a clean bare spot on the tube) or a dent in the tube.
   easy $ · under about $50
4. Lift or spacer driveline angles
   On a lifted truck, vibration that began after the lift points to the rear driveshaft angle or a worn slip yoke. Shops that do lifts can measure and correct angle with shims or a different shaft.
   medium $$ · about $50 to $500
5. Engine and transmission mounts
   Have a helper shift between Drive and Reverse with the hood open and brake held. A mount that lets the engine lunge can cause a shake under load.
   medium $$ · about $50 to $500

Applies to: US-market FJ Cruiser, 2007 to 2014, with the 1GR-FE 4.0L V6 (timing chain) and either the 5-speed automatic or the 6-speed manual. Assumes the part-time 4WD model with a floor-mounted transfer case lever; 2WD trucks skip the 4WD checks.

Tools and parts for these checks

Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.

Go deeper

• Biggest Tires on a Stock FJ Cruiser: Fitment Guide

Other drivetrain problems on the FJ Cruiser

• Clunk or thump from the rear when coming to a stop or pulling away
• Oil leaking from the rear differential, or whining, howling or grinding from the rear axle
• 4WD will not engage, or the A-TRAC / VSC lights come on

More FJ Cruiser problems

• Rust on the frame, especially at the rear crossmember (Frame & Body)
• Steering wheel shimmy or flutter at highway speed (Steering & Suspension)
• Shudder or vibration under light throttle, or hunting and harsh shifts (automatic) (Transmission)
• Turn the key: click or nothing, engine won't crank (Starting & Charging)
• Engine cranks normally but won't start (Fuel & Ignition)
• Rough idle, stumbling or a misfire code (P0300 to P0306) (Fuel & Ignition)

All 16 FJ Cruiser symptoms in the interactive troubleshooter →

General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.