ive got an 07 4.7l, thinkin about some gears, what is everyones opinion on gear size keeping gas milage in mind too. i was thinkin 4.10's tell me what yall think

 

My personal rule of thumb is for stock size up to about 32.5" tires, the 4.10's are ideal. Gives you the best balance of power and fuel economy. Anything at 33" or over and 4.56's would be the best choice.
If you currently have 3.55's then a switch would be highly recommended. If you currently have 3.92's, I don't know if you'd see a big enough difference to justify the cost if you went to 4.10's. I went from the stock 3.92's to 4.56's after lifting and going to 35" tires and the difference was night/day...

 

YEA, I HAVE STOCK 3.55'S, ANYONE KNOW ABOUT WHAT THAT WOULD RUN? GEARS AND INSTALLATION?

 

would 4.56's make a difference with 35's? i have 3.92's right now and it is sluggish as hell. if so where would be the best spot to get the new gears and what brand?

 

How do I find out what gears my truck has. I have an '05 1500 QC 4x4 4.7

 

A search of this topic would probably get you hundreds of hits. The "what gear ratio/what brand" thing makes it's way back to the forefront of this (and most) forums about once a month.
That said, I don't think any one name brand is significantly better than another. This mod is ALL about the installation. This is one you need to find a qualified shop/tech and pay their price to have it done right. Setting gears is not easy, especially in the Chrysler Corporate (AAM) axles, and needs to be done by someone with experience at it.

Popular places to purchase are: Moe's Performance, Air Ram, Randy's Ring & Pinion & 4 Wheel Parts. Google them for the link...

 

I have 35 on a 4.7 with 4.56 I moved from 3.55 gears. It was awesome. I dont even notice that I moved up in tire size.

 

if you open up your glove box and on the back panel there should be a sticker with that info, if not call your local dealer and give him your vin number. also i had the 3.55 in my 4.7 dakota, switched them out for towing purposes and what a big difference it made around town, gained about two miles to the gallon and pretty much stayed the same on the interstate. my swap ran me about 1600.00 for gears, bearing kit, axle seals, oil, labor, tax. 4 x 4 ,

 

yay! let's make another thread about this, and then we can stack all three 3rd gen index!!!

 

Yea D-man, I'm thinkin' the gear issue needs to be a sticky, so we can just refer all these guys to the top of the page...[&:]