My First post, I am taking the 2003 silverado EC to the shop on Wednesday to put in 4.10's from 3.42's, and my custom tune, I want to know what the effect with be, i already have Headers, exhaust, air intake, thats about it, i was running 16.1 to 16.3? Any feedback??

 

Welcome,
She is going to launch alot better I'll tell you that!

 

Gain on low end, loss on top end. I hear lots of folks say to take it easy on the new gears for about 500 miles.

My truck is headed to the shop Wednesday as well to get a 3.73 put in. I drive a lot on the highway and expect to give up a little mpg. We shall see. Let us know how you like it.

 

well its funny how people say you lose topend i didn't unless your talking about the kick down into 2nd then yes but as far as doing 85 mph and punching it, anyone with 3.73 and 3.42 gears wont hang with ya with simular mods , and my mpg was at 21 on the hwy doing 80mph good luck and you will enjoy the 4.10 lol later, kevin

 

Im going from 3.42 to 4.10 in a few days and I can not wait! Its long overdue getting rid of these 3.42's!!!!!!!!!!!!!!!!!!!!!!!!!

 

same here i dont like my 3.42's and i am wanting to run some 3.90's but just cant afford it right now

 

just went from 4.11 to 4.88 nothing but smiles enjoy!!!

 

what kind of headers do you have?... if LT's, then you shouldnt lose to much up top...