Speedo gears

Does anybody know where to buy replacement gears for the speed sensor in the T-case. I currently have a 40 and running 4.45 and 33s. It reads about 4.5 mph to slow. Thinking of getting a 37 tooth gear. Does that sound about right. I have a 95 XJ 4.0 L auto.

http://www.seriousoffroadproducts.c...t&search_in_description=1&keyword=speedometer

Sponsor, and they have a "selector" to help you choose your gear.

On the replacement: There is a write up in the FAQ section, check it out. Links to Charts @ Quadratec (Who is also a Vendor)