Your 01 T&C van may have a similar ignition cylinder R&R procedure as my Dakota. This is from my 2001 Dodge FSM, maybe it will help you:
REMOVAL:
The ignition key must be in the key cylinder for
cylinder removal.
(1) Disconnect negative cable from battery.
(2) Remove upper and lower covers (shrouds) from
steering column.
(3) Place shifter in PARK position.
(4) A retaining pin (Fig. 9) is located at side of key
cylinder assembly.
(a) Rotate key to RUN position.
(b) Press in on retaining pin while pulling key
cylinder from ignition switch.
INSTALLATION
The ignition key must be in the key cylinder for
cylinder installation.
(1) Install the key cylinder into the housing using
care to align the end of the key cylinder with the
ignition switch.
(2) Push the key cylinder in until it clicks.
(3) Replace the upper and lower shrouds.
(4) Reconnect the battery.
A locksmith or the parts department at your Chrysler dealer will have to re-key the new cylinder if you want to retain the original key. If you decide to keep the new key and you have the transponder type ignition key (transponder keys are gray, standard keys are black) the dealer may have to program the new key to your original ignition.
If this were my van I would check first with the Chrysler parts guys. They can use your VIN and order the correct cylinder and key for your van, plus they will have definite info on what needs to be done after the cylinder is replaced. You might also try a powdered graphite, put a liberal amount on the key itself and work it in and out of the cylinder, see if that might help. Most any parts store will carry tubes of powdered graphite. I would say do not put any type of liquid or spray lubricant in the cylinder.