gear ratio on my 1994 chevy c1500 suburban?

[big mexican]

tbi 5.7L automatic tranny and everything is factory
yes the rear end and the differential hasnt been opened

 

[Farmboy666]

Do you have the build sheet? It should be a sticker in glove box. Go to decodethis.com and put in your VIN number and look for the gear ratio on the option list. 3.42 is GU6 and 3.73 is GT4.