im not 100 percent sure but i dont think they make 4.30 for front.. ur gonna have to go with 4.56s... my cousin is running those gears with 31" tires..

 

Use this website to figure out what gear and rpms you want to run.
http://www.csgnetwork.com/multirpmcalc.html
4.56s would put you at 2275 at 70mph, which might drop your mpg some on the highway. but if it's just a weekend driver, then I'd go with the gear your going to feel the most from, and that would be 4.56s...

 

I went from 3.23s with a 275/45/20 to 4.10s & noticed a big difference. I've got a stock 4.8 with a few bolt ons. My truck will actually get out of it's own way now. Went from around 1700 RPMs @ 70 to 2100 RPMs. The guy that I had install the TrueTrac & 4.10s said I probably could have went with 4.56s & been alright.

IMO, at highway speeds I wish I would have went with 3.73s, but I don't do that much highway miles so I'm good.

This is just an FYI as to my experience with switching gears.

 

Motive makes 4.30 front gears

 

By that calculator, if I put 4.30's in with the 4l65e and 30" tires I'll be 21XX rpm's at 65mph. Anybody have 4.30's with a 275/45/20 that can tell me about rpm's around 55 and 75? Thanks.

 

Reviving a very old thread... hopefully... I have a Silverado 5.3 stock. I currently have 3.42 gears. My wheels are currently stock 20". I am going to be putting on new stock 22" wheels. Tire size will be 285 45/R22, which I believe is a 32" tire.

I drive mostly in the city and hwy. I do some occasional pulling of a trailer. Has anyone here run 4.10 gears with that tire size? So far the only feedback I've received is that I don't have to run 4.10s with that tire size, which is great but I would still like to know if anyone has and how they like it.

Thanks.

 

4x4 ? how much will the gear change cost? truck year?

 

Agreed,money better spent elsewhere

 

My truck is a 2010 ext cab 2wd. I don't know how much it will cost. I changed gears (and trans from 350 to 700r4) once in a an old camaro from 3.08 to 3.73 and it made a noticeable difference...

 

Long tube headers and a custom tune would give you 2x the gains IMHO