Does the TC lockup in 3rd when you lock out the over drive?

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2006 Jeep Liberty CRD Limited
1983 Mercedes Benz 240D

Yes. On my '05 (haven't had F37 done), with OD turned off it locks up at 37 mph and above, stays locked up even when I let off the pedal until it drops back below 37 mph.

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Mitchell Oates
'87 MB 300D Diamond Blue Metallic
'87 MB 300D - R.I.P. 12/08
'05 Sport CRD Stone White
Provent CCV Filter/AT2525 Muffler
Stanadyne 30 u/Cat 2 u Fuel Filters
Fumoto Drain/Fleetguard LF3487 Oil filter
V6 Airbox/Amsoil EAA Air Filter
Suncoast TC/Shift Kit/Aux Cooler
Kennedy Lift Pump/Return Fuel Cooler

Not according to my tech. Only in 4 and 5. But what does he know. The manual only states that you need to be going faster than 30 mph to experience the rpm change so at those speeds, it could very well be.

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2006 Sport CRD

Could the Aztecs have known, that in 2012 after a 4 year experiment, our country would cease to exist?

When my overdrive is locked off, the TC locks up at 37 in 3rd also.

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2006 CRD Sport,
Born on 5-20-2006 @ 7:20pm
Jeep Green, Oil drain valve
Tow Package, Transmission skid plate
EHM2, ORM,
Current mileage 79,000.
Past Jeeps: 63 CJ5,
1994, 1995, 2000 Cherokee,
1995, 1997, 2003 Wrangler

The answer is yes, but check it out for yourself.

Turn off OD, take it up to 30mph. Release the accelerator then reapply while watching the rpm.

Now do the same at 40mph.

You will see that in the 30mph case the rpm dips when you release and immediately goes back up when you reapply.
In the 40mph case there will be no (or little) change showing that the TC is indeed locked.

And on page 232 of the owner's manual that came with my 06 it says exactly that

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)