Are there any differences with regard to size of the alloy control arms found on a very early 90s 740 turbo wagon and the steel ones found my 88 760T wagon? Years ago I replaced the steel with the alloy and am wondering if my more-rapid-than-noemal tire wear is a result. Maybe they're longer or shorter?

Do you feel any vibration or pulling or does the car drift left or right when you let go of the steering wheel? Too low tire pressure will cause wide tires to cup up in the middle and wear on the outer edges. The pattern you're seeing may be due to the particular tire tread design.

The inner bushing to ball joint distance is identical. If the lengths were different, camber would be visibly and measurably different, and you'd see posts about interchanging to modify camber (normally not adjustable in the 700/900 car).

The exact pattern of wear will identify what is at fault. Have a tire expert "read" the wear pattern. Don't rotate or remove the tires as it will only confuse the results.

Camber wear, as you are suggesting, would be an inner or outer tread rounded or worn through with little wear on the opposite edge. If you see scuffing or feathering, it is improper toe adjustment.

Thanks, Mapleleafer. The wear I have is a scuffing/feathering. Feeling on the top of the tire, the feathers face forward (most resistance is running my hand across the tire top of the tire from front to rear). What perplexes me is that I get this feathering on both the inside and outside edges of the tire, but not in the middle--and the scuffs face the same direction in and out. It's pretty pronounced--and by several 'home checks' of toe-in, I'm right on the money. I suppose something could be bent--are the alloy arms prone to that? The donor car didn't appear to have been hit...

I'm hesitant to go to an alignment joint, as they charge near $60 where I live, in the Husdon Valley of NY. But that may be the only way to get to the bottom of this.

Thanks again for your help!

Take a good look at the tie-rods and ends. Loose or worn rod ends can throw the toe out of whack...giving the same feathering.

That makes sense...They seem good, but I will take another look.

Thanks!