Folks, search function not working so I'm just going to go ahead and post my issue.

My CRD's shuddering/vibrating a bit at around 45mph and/or around 2000RPM's. It is a cross between a quick vibration and a shudder, can't hear anything but I can feel it in the steering wheel and in my seat. It's relatively subtle but it's there and it's bothering me. I have a stretch of road on the way to work that I try to set the cruise at 50 on and it is especially annoying at that speed. I'm pretty sure it is engine/transmission related because if I throw the trans into neutral the shuddering stops. It just started after a recent roadtrip I did ~6 hours each way, over a weekend, not sure if this matters.

Thanks in advance for your feedback.

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'05 CRD Sport, dark khaki w/ renny flares, GDE Eco tune, Weeks intake elbow kit, Samcos, Delphi lift pump, OME HD lift, Treadwright Guard Dogs or T/A's 245-75-16, Fumoto oil valve, 1.5" wheel spacers

In action on youtube: http://www.youtube.com/watch?v=8oCq4Xa1lH4

Tranny in neutral IIRC would stop drive shaft from spinning and it's not uncommon for bad drive shaft U joints to cause odd vibrations. Chat on the forum about those U joints is they really need to be inspected with the drive shaft off the vehicle. Several reports of ones that looked ok until pulled and looked at closely at which point it was found that the bearings were dust.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Sorry to correct, but anytime the vehicle is moving, the drive shaft is turning. This is true of the front drive shaft as well whether it's in 4 wheel drive or not. I would go with U-Joints and it could be the fact the the shaft is loaded when it's in gear where as when in neutral without the load to keep speed, the vibration dissipates some.

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2006 Liberty CRD, 85,500 miles, ECO Tunes
Dark Khaki, Sport, Sunroof, Tow pkg
I added: EVIC, Cummins Fuel Pump, CAT Filter, Hour meter, heated seats
Michelin LTX2, Double Gauge Pod (Volt, Fuel Press)

Thanks guys I'll check it out again this weekend, not sure if it's getting worse but is pretty bad at 45-50 mph ~2000rpm. If it were a manual trans I would say it felt as if it were about to stall, that kind of shuddering. Mileage doesn't seem to be affected, but I'm only about one tank in to this whole thing...

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'05 CRD Sport, dark khaki w/ renny flares, GDE Eco tune, Weeks intake elbow kit, Samcos, Delphi lift pump, OME HD lift, Treadwright Guard Dogs or T/A's 245-75-16, Fumoto oil valve, 1.5" wheel spacers

In action on youtube: http://www.youtube.com/watch?v=8oCq4Xa1lH4