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Oldsmobile Aurora: Modifications
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Comments
First -- I checked TireRack for load index for 225/40-18 tires; the range was 88 to 92. Load index for stock 235/60-16 tires is 100, meaning your proposed tires are seriously under size for Aurora's weight.
Second -- outer diameter of 225/40-18 tires is 7.1% smaller than stock tires. The usual guideline is to keep difference in replacement tires less than 1%. The effect would be speedo reading ~64 mph when the car is actually going 60 mph. I do not know if the 7% difference can be detected by the PCM or anti-lock brakes; I suspect no.
A much better choice would be 255/45-18, which will give you diameter within 0.2% of stock and load index of 99 to 103.
Hope this helps.
Les
I cant answer your question on how to fix it, but it is possible.
How did you get the radio out, i am trying to take out mine.
i have a 2002 aurora 3.5