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Compliments of Roundman

1983-89 manual 5 spd speedo gears
3.27-19 tooth-pink
3.55-20 tooth-black
3.73-21 tooth-red
4.10-23 tooth-white

1990-1993 manual 5 speed speedo gears
3.08-20 tooth-black
3.27-21 tooth-red
3.55-23 tooth-white

1984-1989 automatic AOD speedo gear
3.27-19 tooth
3.55-20 tooth
3.73-21 tooth
4.10-23 tooth

1990-1993 automatic AOD speedo gear
2.73-19 tooth
3.08-20 tooth
3.27-21 tooth
3.55-23 tooth

link provided by furrelkt http://steeda.com/store/-catalog/speedometer.htm

link provided by import slayer http://www.buicks.net/shop/speedo.html

link with useful calculator (includes tire size) from Magiarn71 http://www.mindspring.com/~steveflye...ear_select.htm

cholericfc

One problem that I have:

I have a 1990 GT that was AOD and I switched it to a World Class T5 - I think from an 88 or 89, 89.

ALSO, I have 3.90 gears in it.

WHAT SPEEDO GEAR DO I NEED?

cholericfc

Do they make a 22-tooth speedo gear? haha