sevans327

iTrader: (2)

I was just wondering what everyone is running for gears here. I was noticing at 80 I am turning 2000 rpm did the math have 3.42 gears with 32 inch tall tires. I was thinking switching to 3.73 or 4.10 might give me a little more power and not hurt my mileage. What are your thoughts?

Shawn

2001CamaroGuy

iTrader: (5)

Well I have a set of stock 3.73s that I won't be needing anymore (I'm going to 4.56 gears) so if you want to buy them from me I'll sell them to you for cheap. They have 90K miles on them but have never been abused and should be perfectly fine (I'll know Wed when I have the new gears in).

I personally also have 32" tall tires and wanted more gear. I get about 17.5-18.5 MPG average around Phoenix (45%/35% surface street/highway) with the 3.73s but feel I'm really lugging the engine with the big tires so I hope MPGs will stay the same if not go up.

95ImpSS

iTrader: (2)

Not a power adder, but helps inertia. Shorter gears such as 4.10s would definitely yield a difference in off-the-line performance from 3.42s. Mileage may suffer up to 2mpg, but more likely only by 1mpg. I get 17mpg in my truck w/4.10s (5.3L w/ bolt-ons) driving pretty spirited, and have also gotten the same while cruising with nearly 1000lbs of load on a 100-mile hwy trip.

xsports33

iTrader: (1)

i would also say go 4.10s the difference from 3.42s to 3.73 isn't worth the money and you won't feel "that much" of a difference. If you're doing it for mileage it depends on your driving habits. If you do mostly highway i'd go for the taller gear (3.73). Around town/city driving i'd do the shorter gear (4.10).

Is this going on the truck in your sig? You already have 4.10s ?

trever1t

iTrader: (14)

4.10s.for that tire diameter. I swapped to 3.73's and it was barely a notable change until I went with a smaller tire diameter (30.5). My highway mpg is pretty good too.

RandomHero

iTrader: (24)

Yea a lot of it depeneds on your tire size. I have 3.42's right now which I'll be upgrading to 4.10s, but I run a 29" tire on my truck so it's not terrible. Now if you're running a 31.6(265/75/16) or something like that then I would definitely go 4.10's. It all depends what your tire size is.

95ImpSS

iTrader: (2)

Just noticed that... looks like he has/had plans on buying, but may be looking for opinions.

sevans327

iTrader: (2)

The truck in my sig is just a play toy. I drive a 2005 gmc crewcab 4x4 with a magncharger. I just got back from a 100 mle trip to drop some stuff off. my truck got better mileage at 87 than at 77 on the way there. I think gears would defiantley help.

Shawn

CDN SS

iTrader: (1)

80 mph@2k ?? sounds low for 3.42 even with 32 tires .almost sounds like 3.23 gears

Rear Gear Cjhange .....I am thinking same thing 2004 5.3 2wd with 3.42 gears and 31.6 tires thinking about ratio change for towing not sure what to go to 3.73 .3.90 or 4.10 also looking or those who have real world experience regarding mileage when not towing

Truckshop

iTrader: (17)

i have 3.73's with a 31" tire and i am goind with 4.10