anyone know what the second gear ratio is for a 04 GMC with a automatic transmission is?

 

I believe the 4L60E is:
3.06 in 1st,
1.67 in 2nd,
1.00 in 3rd
.75 in OD.
Jim

 

Kinda off topic....

Why do I see most people latley running their dynos in 2nd gear? If 3rd is the 1 to 1 wouldent running it in second gear offset the numbers?

 

They hit the rev limiter/speed limiter in 3rd on a stock truck. If I dyno mine with stock gears and these tall tires it will have to be in 2nd also as my tires are not for high speeds.

 

So then is there a formula to find your real dyno numbers?

 

if its a 4L60E(or 4L65E), the ratios r 3.06, 1.63, 1.00, 0.70

 

3.06 to 1.63 split,i wonder what college boy thought of that?that explains why these things fall on there face on the 1-2 shift.
MAC, that is why i need the ratio for the correction factor on the dyno.
thanks again boys.