I am running 22's 285/45/22 size. The GM factory wheels are heavy as **** (85# per wheel/tire combo). I need more getup. The stock 3.42's ain't cutting it anymore. Which gear would yall think would be better? I don't drive much on the highway, just around town to work is about it. I hear the 4.56 is really the way to go but not sure.

 

Thats a 32" tire. My vote goes for 4.11's. That would be just right in my opinion. 4.56 would be a bit much if you ever did do any HWY driving.

4.11's = approximately 2115 rpm at 70 mph
4.56's = approximately 2350 rpm at 70 mph

 

what he said,

I have had a bunch of 3.73's and one 4.11[08 6.0] and didn't notice a lot between them.
But a 4.11 is a long way from 3.42

 

Alrighty, I guess it's 4.11's then.

 

If youre ever going to go with larger/heavier tires then go 4.56. I have 3.73s with heavy *** rolling stock and it definitely needs a lot more help. The 6 speeds have an even more overdriven final gear ratio than the 70e Im running. If youre going to stay with the same rolling stock then 4.10s.

 

What he said

 

4:11s on a 275/55/20 at 70mph is 2000rpm

 

I've considered 4.56s for my truck several times; it definitely would be more performance oriented, but drivability would improve as well. I just don't want to spend the money to regear two differentials.

 

Before adding gears on a 4wd, I would do full exhaust, a small tq cam and of course tune. That will go a long ways to adding some down low tq for when youre cruising down the highway locked in OD. Ive got a set of 4.10s and a 6L80e waiting to go in so Ill let you all know how it goes

 

I am currently running 4.30s on mine. 305/40/22s..highway does suck i agree..(70mph @ 2700) ...on freeway runs, I max out my rpms at around 5800...cam is my next step...

theres a couple perks, Take off is great, second gear is a beast and on 20mph rolls truck really leaps on other trucks. If you dont really drive it too much and not really use it on highways i would recommend the 4.30s for that size tire.