Speedo gear ?'s

rad_al_

Registered User
I've installed a 20T speedo gear to help correct the change in my tire size & rear end. I used the formula from the faq page which came out to a 19.5. It feels like my car is going slower than what my speedometer shows. Also, when I drive by the auto radar booths at the side of the road, it shows I'm going slower than what I thought (approx 4 mph off at 50 mph). If I drop down to a 19T gear will it help correct the problem or do I need to go to a 21T? Here's what I have:
1994 w/ 5 speed
3:27 rear end
255/50/17 Fuzion ZRi (27.1" diameter according to the specs at Tire Rack)
 
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