Thanks Evan for your response. My s10 fifth gear is 0 .76 so accordingly if it is

A 3.90 x 0.76 = 2.96

B 3.55 x 0.76 = 2.69

c 3.73 x 0.76 = 2.83

According to Tom Langdon web site the gear ratio should be between 2.50 and 3.0 so looks like whatever I have is within range. I will take the differential cover off to determine exactly what I have then the question is what is the preferred ratio or should I not worry about it?

Rick