Why does my Lincoln Mark LT vibrate between 45 and 60 mph, or make a ticking noise?

Short answer: A Mark LT that shakes between about 45 and 60 mph and smooths out above that usually has a driveline problem. Worn U-joints (the flexible joints in the driveshaft) or the center bearing are common on high-mile trucks. Old transmission fluid can also make the torque converter shudder there. Have the wheels balanced too. If the 5.4L V8 ticks, check for a loose spark plug first.

Symptom: Between about 45 and 60 mph you feel more vibration, and it fades above 60. Or the V8 makes a ticking noise.

What to check first

1. Grab the driveshaft with the truck parked and safely supported and feel for play at the U-joints.
2. Look at the center bearing rubber for cracks.
3. Check the wheels for missing balance weights.
4. Ask about the transmission fluid. If it's never been changed, consider a service.
5. Listen for where the tick comes from. A tick near one plug can mean a loose spark plug.

Likely causes

1. Worn U-joints or driveshaft center bearing. U-joints are the flexible joints in the driveshaft. Members said worn ones, or a worn center bearing mount, cause speed-related vibration on high-mile trucks.
2. Torque converter shudder from old fluid. A member said aged transmission fluid can make the torque converter shudder at these speeds.
3. Thrown wheel weight or worn shocks. A wheel that lost its balance weight shakes at certain speeds.
4. Loose spark plug or valvetrain noise on the 5.4L. For a ticking engine, a member said to check for a loose spark plug. Another pointed to known 5.4L 3-valve ticking causes.

What it usually costs

No owner posted prices in these threads.

Is it safe to keep driving?

A worn U-joint can break and drop the driveshaft, which is dangerous at speed. Have a growing vibration checked soon. A loose spark plug can blow out of the head, so don't ignore a new tick. Verify with a mechanic.

DIY or shop?

Mixed. Checking for play is DIY. U-joints, bearings and spark plug repairs on this engine are usually shop work.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists this recall touching this area of the Lincoln Mark LT: 08V208000 (2006 model year, brake booster vacuum hose). Check your VIN at nhtsa.gov/recalls. If your car is part of this recall, the dealer fixes it for free.
• Plain words: Recall 08V208000 covered 2005–2006 F-150 and Mark LT trucks with the 5.4L 3-valve engine whose brake booster vacuum hose could degrade and make braking harder. It doesn't cause a vibration or engine tick, but it's a safety item. If your truck is part of this recall, the dealer fixes it for free. Verify with a mechanic.
• NHTSA complaints: 12 keyword-matched complaints for Lincoln Mark LT 2006–2008 (of 40 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-28; keywords: vibration, shake, shimmy, tick, noise, start, crank) (NHTSA returned no data for 2 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Increased vibration on my 2008 Lincoln Mark LT Truck between 45 and 60 mph on Car Talk, a 212,000-mile 2008 Mark LT vibrated more between 45 and 60 mph and smoothed out above 60, with no wobble. Members suggested a driveline vibration from worn U-joints or the center bearing, torque converter shudder from old transmission fluid, a thrown wheel weight, worn shocks, and worn suspension bushings.
• In 2007 Lincoln Mark LT makes a ticking noise on Car Talk, an owner said the engine in a 2007 Mark LT had a ticking noise. One member pointed to the known ticking causes on the Ford 5.4L 3-valve engine, and another said to check for a loose spark plug.

Quick tip

Note exactly when the shake starts and stops. A shake that lives between two speeds and fades above them points to the driveline or balance, not the engine.

Vehicle focus: 2006–2008 Lincoln Mark LT pickup (5.4L V8, US).

Safety / mechanic note

Never get under a truck held up only by a jack. Use jack stands. Verify with a mechanic.