I really liked them when they were new. Very ground-breaking in many respects AND influenced a good many GM products which came out later. The Olds Intrigue, to be specific, in feel and general demeanor. Funny how the 2000 LeSabre's suspension became more "LH like" in "decreased bounce", by observation.
The LHS was my rent car of choice, from Dollar, for years. Then the later 300M. Plus an Intrepid or two, with a Concorde or two, also.
When the last-gen Buick Park Avenue came out, I went to a consumer ride/drive event. Of course, one of the competitors we would drive for comparison was a bench seat LHS. First car I drove was a base Park Avenue. When we got to the low speed slalom, the product guy riding with me said "Target speed is 20mph. Just drive through the cones and I'll watch your speed for you." So, when I got to 20mph, it understeered and I was mowing down cones. Next was the upgraded suspension/supercharged Ultra. Started a bit "hot" and was mowing down cones by the second one. At about 23mph. That's when I discovered the one issue with GM's MagnaSteer that NOBODY had ever mentioned. The magnets could not change fast enough to maintain a steady boost, resulting in the same result as "pump catch" where the steering boost would lapse during turning the steering wheel. Did the fwd Continental. Soft ride, easy steering, and worse understeer than the PA, which was expected. THEN came the bench seat LHS. Went through at 25mph, drive around ALL cones, no problem! I smiled, but didn't tell him how much seat time I'd had in those cars. LOL
One of the weekly, import-oriented magazine had tested a PA ULtra and was impressed with the nandling in the hills around Los Angeles. A month or so later, they tested an LHS. Thought it was equaling what the PA Ultra had done, UNTIL they looked at their speed and they were driving it just as easily, but over 10mph faster. No drama.
The LH cars are geared to they use a bit more rpm than similar GM cars do. But it all works fine and the 3.5L was happy everywhere. Cruising through residential areas or on the Interstate at 75mph (where it would usually average about 26mpg when new, more mpg with more miles. The aerodynamics on the Concorde are a bit better, which resulted in about 27.5 on Interstate runs (with the 3.5L).
I like the fact the engine sits in them "right", rather than sideways. The 3.5L will provide good performance, even with a bit less than 220 horsepower. The 300M (2nd gen 3.5L) has more.
The car is designed such that in order to install rear struts, you have to remove the rear seat assy to get to some of the nuts/bolts. I believe the 300M is not that way, with a different rear suspension cradle/mount?
The many LHSs I rented would usually get about 26mph on Interstate runs, average, but would get more like 30 with more miles on them. The 300Ms would do (on the trip computer) 29-30 at 60mph (on a specific freeway section with no wind and completely flat. BUT it only dropped to 27mph at 90mph. Great aerodynamics, I suspect, as engine rpm was not that much greater. Great, all-around cars, except . . .
My mother's '95 New Yorker (LHS with a split bench and specific interior pattern, similar to a '69 New Yorker pattern) started to have a slight issue with the BCM. First I noticed a slight delay in the wipers reacting to input on the "delay" function. Later, the factory alarm would re-energize by itself. Made the horn honk for a split second longer than just a chirp. I would re-set it and it might happen again, later. But sometimes it would turn the light on and the battery run-down protection would kick in. Which I'd notice when I started it the next day. Sometimes, it'd kill the battery. Which is when I discovered the Interstate battery the dealer put in was over 7 years old. A new one didn't alter anything.
Eventually, things stopped working, one by one, until the cluster didn't work, nor did the a/c system. About that time, she stopped driving. I'd just remove a certain fuse to keep the battery "up" overnight. Finally just unhooked the battery altogether. That was at about 95K miles. It has sat every since.
As to the 2.7L, it is a good "drive-around" engine, from my experiences. It will seem "low power" at lower rpms, BUT if you hit WOT at the right road speed to get a downshift into 2nd, you'd better have it aimed where you want to go. Otherwise, "adequate" with no real mpg advantage, except in the EPA ratings.
On her's the outside mode door actuator started to click and not change from outside to inside air. Have to take the instrument panel loose to get to it. Needed a power lock actuator on one of the rear doors. Power antenna needed a new mast (an easy fix). The small town dealer (whose wife had it for her demo) advocated for a new timing belt at about 60K miles, which was about 6 years at that time, so it was done. Another time, it needed a new relay for the engine cooling fan, and somehow they did something that put the trans into limp-in mode. Just as with other computers, it was fixed when the car was re-started. BUT in the process, I had a local trans shop (whom I've know for many years AND likes Chrysler stuff) to a check on the trans. That's when I found that clutch friction material wear is determined by how long it takes for the circuit to "apply". Even at 90+K miles, it was still at the bottom of the spec.
As with many later-model rack and pinion steering cars, the outer tie-rod ends have rubber isolation in them. With use, the steering can get sloppy, making an noise like a loose shock absorber up front used to. GM uses something like that, too, as do many Fords. Moog has a replacement that's better.
There is a Chrysler 300M Enthusiasts Club, with an extensive website. Not to forget
www.dodgeintrepid.net, which covers first and second gen LH cars.
Similar GM cars might ride and drive a bit smoother, but the LACK the "athletic, light-on-its-feet" feel all of the LH cars have. Plus a firm, but comfortable, ride.
Get a FSM to really appreciate all of the design and electronics that went into those cars.
Shop well!
CBODY67