my truck is a complete bog driving down the road. its got the stock 3.73s in it and theres just no drivadility. if i do a gear change what gears should i go to and will it effect my milage at all??? also, how hard is it to swap gears and how much are the parts.also, will it give me some more hp and tq??? i would expect tq. oh i almost forgot, how hard is it to clean the tb??? and how do i clean it

 

check out moesperformance.com, havent done them yet but everyone said the 4.56s will effect your highway mileage, i wouldnt try doing it yourself unless you know what your doing (from what i have read) and a shop locally told me 900 to do both front and rear because im 4x4 that includes the gears, and the throttle body is held on by i wanna say 4 bolts after you take the intake off, take the sensor off and pull it out, spray the front and back good wipe it down and put it back on

 

so the highway milage will drop??? so i cant take the tb off the truck by itself???

 

If you are unsure how to clean a throttle body, don't even attempt to do gears yourself. Even most general mechanics sub out gear work. Find you a shop that does it on a regular basis to have it done.
You will GAIN mpgs in town, FEEL more power to the wheels, tow better, lessen transmission strain and wear and probably have a few other benefits I failed to mention. Your gas mileage on the interstate will probably drop a mpg or two, especially up over 75 mph or so, but that's really the only negative here.

As far as the TB cleaning, as with most common questions you need to GOTO the FAQ section:

https://dodgeforum.com/forum/3rd-gen...y-hemivec.html

 

oh yea i wasnt even thinkin about doing the gears myself im not that strong of a mechanic. would it be smarter toput 4.10s in it? or what?? but im not a very strone mechanic so i dont do very much stuff that big on my own but im sure i could handle the throttle body with my brother, whos been a mechanic all his life.

 

Is your truck an auto or a manual, and how big of a tire to you plan to put on it?

 

its a 5 speed manual and im just gonna either keep it stock size or put 33s on it

 

Well w/ 33's and 4.56's you'd be running close to 2373 rpm at 70 vs. 4.10's at 2130 rpm. If you have smaller/shorter tires now then you rpm will be higher than w/ 33's.

 

so your sayin that if i put 33s on it or leave it stock height i should go with 4.10s???

 

That's my opinion w/ the stock tire sizes. I've got the nv3500 as well and went w/ 4.10's myself. I think your truck probably has 3.55's in it now, check the glove box sticker or the tag on the rear end to be sure.