Speedo gear for 275/60-15 ?

[snoxer]

What gear is needed in the trans to get the speedo more acurate on an 87 GN with 3.42:1, 275-60-15 tires and an analog gauge if it matters. I thought I seen on here before to use a black driven? Part # ?

 

[77 cruiser]

try this

http://www.tciauto.com/tech_info/speedo_gears.htm

Jim

 

[MeanBuicks]

That tire is right at 28" tall so the 27-tooth black gear looks like it.

Oh...good link Jim.

 

[snoxer]

Thanks for the info, that link is great. Especially when someone does the figuring for you.