Well I'd like to change my gears, I made another thread and someone suggested I goto 4.56 gears that the acceleration is better?

What do most people do? I would have the work done locally, but Id need the parts to bring with me. What all do I need to order?

Sorry if thats a really noobie question, but Id really like to figure out something to give my truck a little umph it's kind of a dog.

 

4.56 would be a great gear for acceleration. You might lose a little on the top end highway but it will be worth it from the lights. It also will depend on what kind of driving you do all the time.

 

pick your gear ratio first. id recomend 4.56 as do all the others. since its 2wd you only need the rear. pick up the gears, an installation kit, and if you wanted, since theyre already working in there, you could install a locker such as a detriot or an auburn

 

What is involved $$ and technically? I've got a 3.55 rear gear in mine and probably will be towing enough (5500-6000# on occassion) that I might need to swap the rear gear for that. Does the speedo or engine computer need adjustment? What about the limited slip, does that complicate matters? Can you go the dealer and just ask them to swap in 3.92s?

 

A great mod and definitely one you don't want to do yourself. Gears are a royal PIA in general and the AAM (Chrysler Corporate) axles are harder than most. If you have 3.55s and tow, you would want to increase to at least 4.10s. Not only will your acceleration increase, your in-town mileage will increase (highway could go down 1 or 2 mpg, depending on how much over the speed limit you go) and your TOWING CAPACITY will increase. A Dodge Ram 1500s towing capacity will increase by 1000 lbs. with the Mopar 3.92s over the 3.55s, AS PER DODGE SPECS!
For a 2wd you'd need the gears, an install kit (master kit recommended, but you could get away with a minor install kit if you have less than 20k on your truck), and of course the gear lube, sealant or gasket for the diff cover.
As far as a limited slip differential goes, it would be a benefit, especially if you ever have to tow in slippery situations, such as on a boat ramp or just towing on wet pavement, dirt roads, grass, etc. Instead of spinning one tire and going nowhere, you have a better chance of "hooking up" and getting on your way. The Auburn Gear LSD is an excellent unit. Installation should not be bad if done along with the gears, since it would only take an extra 20 mins or so to install if your already swapping gears.
You could choose to go to the dealer and get the Mopar 3.92s, but you'll pay way higher for the gears and install, plus for tires up to 33", the 4.10s actually give the best performance/economy ratio, 4.56 for tires larger than 33". Any heavy truck (QC 4x4) would benefit best with 4.56s for anything from stock up to 37" tires.
Best bet on price with good service would be Moe's Performance or Air Ram...

 

Yeah, i didnt use a master or minor instal kit. It is 15 k miles later and im still good. just my 2 cents.

 

No, I wasn't planning on installing them myself. The truck is nearly new, they were giving away 2008 Quad Cabs with $15,000 off but all they had were 3.55's. It has the factory tow package and tow mirrors. OK, if I get the 4.10 and find a local (Kansas City) shop to install it, what else needs adjusted. The diff right now is a limited slip, will the gear change alter that? How about the speedo or the ECU?

 

The LSD will stay, they'll have to remove it with the old gears, but they can put it back in. The Mopar lsds have a reputation as ticking time bombs, however, I've not heard tell of them exploding rear ends on anything newer than the early '06s yet. So you may be ok with it. If the money's there an Auburn Gear LSD or Detroit TruTrac will outperform the stock LSD hands down.
As far as other adjustments, there are none that need to be made. Because of the location of speedo sensor, it will not be affected by a gear swap, only a tire size change will effect it, ECU will also be unaffected. The tranny will be though, but in a good way, it won't be searching for the right gear nearly as often because the 3.92s will get you to the power band faster and keep you there longer. Theoretically, the change to the higher gearing will make a tranny last longer.