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You'll probably want to find out what you have in there (how many teeth).
The NOTE in ZIP's catalog states a 1-1/2 MPH difference for each tooth added or subtracted, so if you know how many teeth you currently have and how many MPH you are off, hopefully, you'll be able to get a gear to compensate.
Not trying to lose business for ZIP (I bought two gears from them and am happy), but if you don't want to wait for shipping, your local Chevy dealer may have the gear in stock too.
I had the stock 3.08:1 ring and pinion and went to a 3.55:1 gear set. I was about 5-6 mph fast. I swapped the 19 tooth speedo gear with a 22 tooth gear to correct the problem. :cool: