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speedometer gear

J

john davis

Guest
I currantly have a 700r4 trans with 3.70 gears with 245/60/15 tires in my 75 vette. My speedometer reads way too fast howmany tooth gear do I ned I have a 45 tooth gear now would a 42 or 43 be about right? thanks jd
 
S

ssvett

Guest
JD, I have installed many 700R4's in early model Corvettes, I ask my freindly GM parts man and he hasn't messed up yet. I know he will need to know the rear diff ratio and the hieght of the rear tires. Hope this helps............Steve
 

Tom Bryant

Well-known member
Administrator
Joined
Nov 9, 2000
Messages
7,279
Location
Edgerton, Ohio, United States
Corvette
1959 black 270hp (9/2/69) 1981 Beige L81(10/20/80)
gear

John,
Steve is right. Your GM dealer has charts for gear selection. Also if your speedo is reading faster that you are going you need a bigger gear to slow the shaft down.
Tom
 

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