I just got a 6.2 with 6 speed being thinking about changing the 3.42 to 4.56 but I would like some feedback has anyone done this already ? How's mileage? Mines nothing special just a 2wd 4dr im really interested to hear some feedback thanks ..and it sits on factory 20's

 

Anyone ..

 

Try waiting more then 5 hours for a response.

You might also look around in the GMT 900 section since those are the Trucks that have the 6 speed's

 

https://www.performancetrucks.net/fo...3D-wow-513233/

 

i wouldn't jump to 4.56 unless your running a 33s or bigger. Several guys have made the jump to 4.10s and love it.

 

I'm running 4:11's with a 6 speed with 33's an love them. 70 mph at 2000 an 80 at 2300. It hauls a ton better an mpg is averaging 16.5 around town an highway. 4:56 would be too much I think

 

Ik of 2 guys that did 4.88's with their t-56 6 spd's and they said its absolutely rediculois one is behind a 6.0 and the other is behind a 4.8. I myself have a t-56 behind a 5.7 in my 04 silverado I still have my stock 3.73's but I definitely need more. 6th gear at 80 mph I'm at like 1200 rpm's I'm also running on 20's though. I want more at the low end

 

Hes talking about the 6-spd auto


I'm upgrading to 3.73s on mine, but its 2wd(and coming from 3.08s) on my '12 Tahoe. Loved the 3.73s in my '08 Silverado with the 4L60e, so should be even better with the 6L80e.

 

i would switch to 3.73 in a 6l80e

t-56 i wouldnt go any higher than 4.30's

 

My decision is between 3.73 & 4.11, also a crew cab 6 speed on factory 20s, except I'm 4x4 & 5.3. There are a lot of threads on this subject and I think either gear is a good choice. I'm still deciding because they both have their strong points, it really depends on what you're doing with the truck or if you ever plan to change tire sizes. I hope to swap mine in the next 6 weeks.