Need correct speedo gear

[Treachery]

I recently had a Tremec 3550 TKO-II (.82 OD) installed. It seems that my speedometer is going slower than my actual speed.

I had 3.73 gears installed long ago and had the speedo gear changed to a 21 or 22 tooth. This made my speedometer go faster than my actual speed. But after the tranny swap, the speedometer speed is slower than my actual.

What would be the correct speedo gear.

Thanks.

 

[jrichker]

See http://www.hanlonmotorsports.com/t5speedo.asp

Or
Check to see if there is a speedometer shop in your area. If there is, ask about the Stewart-Warner speedometer gearbox. I believe it is either a 777 Series Drive Joint Kits and Parts or 666 Series Drive Joint Kits and Parts. It is a small gear box that fits between the speedo pickup gear on the transmission and the speedometer. It has quick change gears that allow you to choose almost any tire size and rear end gear ratio you want. This will allow you to get the accuracy with within 2%-3% or less. The drawback is that it isn't cheap.