im just curious if anybody can give me an idea, im changing gears this winter anyway but it just boggles my mind. heres whats up.
at 70 mph on the free way im running close to 2500 rpm's, but every one i know aroung here with the 4l60E they run just under 2000 rpm's dont know but just curious

thanks Jason

 

There's about 3 ways of finding out:

1: Check your build codes inside your glove box for the performance axle ratio code, Can't remember the code number though

2: I believe if your shifter console displays gear 1 then you have 3.23 gears, else 2.73s

3. Remove the differential cover and check on the gears itself.

The easiest way would be to check the build code, does anyone know the code off the top of their head?

 

RPO Codes:

GU2=2.73 Ratio
GU4=3.08 Ratio
GU5=3.23 Ratio
GU6=3.42 Ratio

 

Thank You.

 

i ahve the gu5 but everyone else i know also have the gu5 but are running lower rpm's than i but i come out of hole slower than a slug

thanks Jason

 

Jack up the rear wheels. Have some one spin the rear tires one complete revolution while you watch the drive shaft and count the spins. If it spins 2 3/4 turns, then youve got 2.73's, about 3 1/4 then you have 3.23's, if it spins 3 3/4 turns then you have 3.73's ect. Understand what im saying?

 

Good point.

 

ok but have you ever heard of a 2.73 car going 13.7 in the quarter on motor with a 2.0 sixty

thanks Jason

 

Every car is differnet. I didnt say you had 2.73's. You wanted to know what gears you had i, just told you how to easily find out.

 

i know you were helping me i didn't mean to be a smart a$$ it just bugs the **** out of me