1991 Mercury Grand Marquis LS from North America - Comments

Alternator most recently.

The battery was replaced also at the same time.

My father in-law replaced the entire A/C.

System before he gave us the car.

Muffler and tailpipe also.

My father in-law left the car to us when he passed away. It had been very well taken care of, and has low mileage for the year. Everything about this car I love. The more I drive it the better it gets. The alternator went out the first day we had it, easiest I have ever replaced, cheap too. The only problems I have experienced are a slight shifting /finding right gear at 40 MPH. Also the only other thing that really bugs me is when in a turn with any speed at all the tires start squealing. The 215/70/15 seem way to small for this car.I'm thinking of switching to a late model stock 16" steel wheel and police size 225/70/16. if anyone knows the fix to these problems please contact me at russelljohnson@alltel.net.

Switching to a larger wheel size will not necessarily solve your tire squeal problems. It will also cause problems with your speedometer reading, engine computer and possibly your ABS.

Try inflating your tires a pound or two over the recommended pressure, or try different tires. A 205/60-15 would have the same overall diameter, but a lower profile.

You should have been able to figure this stuff out yourself anyway, being the The Professor and all :0.

The previous comment is incorrect. You have to go up in size as you go down in sidewall aspect ratio, so if you want to switch to a 60 series tire, you would have to go to a 235/60-15 (if that size exists) to keep the same overall diameter as your 215/70-15.

What does the reference to being the Professor mean?

I am the original poster and would like to thank and reply to the last two comments. The first poster was referring the the professor off of Giliigan's Island and was trying to be funny. Good try. The 205/60/15 would have the Mercury scraping everything in sight. when I stated about changing tire and wheel size I was referring to aspect ratio (sidewall size. If the sidewall flex is to great it start to break away traction when pushed hard. Since I wrote the original

here I have looked into this problem. And come up with this,

Mercury has change tire size and wheel size on the later models. OE now is 225/60/16.I am able to do the swap from

tire rack. com with steel wheels (16x7) and H or V rated performance tires for 600.00. Also if you keep the original

tire height close to specs you will not have problems with

the trans computer or speedo. By the way if my kids aren't in the car it usually is coming out of the right anyways.Thanks.

When I replaced my tires, I kept the same 15 inch turbine wheels, but changed the tire size to 225/70-15 instead of the 215/75-15. I also replaced the shocks with firmer ones. The cars handles awesome now considering it's size and weight. And, the wider profile tires make the car look beefier.