Speedo Gear problems

1FatPony

Member
Jun 5, 2005
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So I have 3.55 gears and my speedo is about 30% off. So I buy a 20 tooth speedo gear which is correct for an 87 5 speed with 3.55 gears. I go to install it and there is already a 20 tooth in there. Now what???
 
The stock range of speedo gears work correctly with a limited range of tire sizes. The 23 tooth white gear works good for some guys, but self destructs in a few months for others.

See http://www.corral.net/tech/gearcalc.html for more help

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 within 1%-3%. The drawback is that it isn't cheap.
Please excuse the typo (their's, not mine) in the following picture - it should read Custom ratio adapters, not Custom radio adapters.
ratios.jpg

See http://www.gaugeguys.com/ratioadapt.htm for more info.
 
1FatPony said:
is it possible to look into the tranny through the speedo cable hole to see the other gear?
Only if you like peep shows. Otherwise, you need an eyeball on a stalk like a snail.

There is limited visiblity through the hole. It would not be easy to count the number of teeth using that method.
 
stock gear teeth from 86-89 T5 is yellow in color and have seven teeth. I have my tranny out right now and just looked at it. 90-95 T5 has eight teeth which is green.