The only difference is the speedo driven gear, tire size on the donor doesn't matter. I've never checked if the 1995+ cars have yet another driven gear size.
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Originally Posted by Somebody on Teamswift once upon a time
speedometer ratio (faster) 18 x 16(brown) for wheels 14" (gt,gti)
speedometer ratio (slow) 18 x 17(white)for wheels 13" (ga,gl,glx,gs)
speedometer ratio (slower)18 x 18 (yellow/beige) for wheels 12"
the speedometer drive plastic gear with 18 teeth is the same on all(fixed on diff.).the differents are only on speedometer driven plastic gear (smaller on which is speedo cable) 16 teeth for 14"wheels and 17 teeth for 13" wheels.if you put on car 14" wheels you must have speedometer driven gear with 16 teeth so the cord can spin faster for speedometer because with bigger wheels for one turn car cross larger way.
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