Hello Lost!

I am having a strong vibration through the entire Jeep at 45-65 MPH. Goes away once you get to 70 and does not show up before 45.

It vibrates when you are accelerating but does not vibrate when not moving but reving the engine. (This makes me think its not engine related)

The vibration is so strong and fast it feels like a cell phone through out the entire cabin. The vibration does not change when in 4WD high either.

Any thoughts?

Take it to a tire shop, get it on a lift, and check the front bearings for noise/play/shuffle.

They're known to fail.

Also next time you take a drive, when you stop check the wheels to see if they're getting heated, the calipers are known to stick too.

If it's neither of those, come back and tell us more about it and we'll diagnose more. It may also be the transmission tune shudder at 55mph that you're experiencing, but 45mph seems low for that which is why I suggested you check the other things.

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Silver 2006 KJ 2.8L CRD Limited:
GDE ECO Tune / Fumoto Valve / E-Tecno GX3123 7v Glow Plugs / 2nd Gen Fuel Head / Mishimoto RED Hoses / Rockers/Lifters @ 114k / Hayden FC + 11 Blade Nylon / Sears P1 Battery / Transgo 45RFE-HD2 Reprogramming Kit / Timken Front Bearings

Will be checking those today, along with tire balancing.

Thanks

Drive train probably. Could be anything from separated tire tread/balance, on thru bad CV joints to bad "U" joints, etc.

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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

Bet it's your u joints in the rear driveshaft.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

Ding ding ding!!

Rear u Joint at axle. Replaced and good to go.