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1984 carrera cab rear shaking problem - follow up

Suspension and Steering

Vehicle Information: Model: 911; Year: 1984; Body Type: Convertible; Engine (type, size, modifications): 3.2; Total Mileage: 90k;

Here is a follow up to my 1984 carrera cab rear shaking problem.I had no luck in getting a set of loaner wheels to try out and pinpoint if that was my shaking problem. But in my tire research, I realized the wrong size tires were on my car; they were wrong in every way. The rating was overkill, the profile was too low, and too wide for the rims by one size. All of those things promoted a very hard tire and flat spots developed on the outer portions of the tires which would not go away even after a long drive. When I had them inspected by 2 tire places, I think they just didn't take the time to notice these things, they just went thru the std balance... and said all was ok.So anyway, I went and picked out some new tires, the correct size and rating. I actually got a good price from the on a set of Kumho's. I had them installed last night, took her for a drive and Oh Boy! Car like new! Beautiful ride!!Interesting thing on this test drive; when I went and sat down in the driver seat for the test drive, the back of the seat (4 way electric) went all the way up and stuck there!! It will not come back down! This would not be such a bad thing if I was around 5'-9" to 6'-0" tall but I am 6'-4" tall, needless to say, I need the seat all the way down. New problem to solve. Yes I was born in the wrong body for a Porsche Enthusiast!Thank you very much for directing me to re-visit looking at my tires. It was the problem.

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