Next Mod: 4.56s or KRC 210 cam

glass3222 · Jul 9, 2010

I am having trouble deciding what my next mod is going to be. I have it narrowed down to either a set of 4.56 gears or a KRC 210/210x cam. I know there are pros and cons to each.

My mods are in my signature and I have 3.92s with factory LSD. My truck is my daily driver. I average about 1200 miles a month, mixed city and highway driving.

So what do you think?

rocket · Jul 9, 2010

I'm broke leave me alone with the mods, already..j/k ,lol.I would do the cam. I like my 3.92's,

cheapbeater · Jul 9, 2010

i would do gears and a locker (truetrac/auburn) first, that way you can get rid of the crappy stock locker if you have one... and i think gears are a better bang for the buck (i think)

rocket · Jul 9, 2010

Is that a hole in the water behind that truck cheap?

AF_Hemi · Jul 9, 2010

First off there really aren't any disadvantages to either of those mods.I would do gears first along with an LSD (not a locker).

glass3222 · Jul 9, 2010

Here are my thoughts on the advantages and disadvantages of each. Please let me know what you think.

The disadvantage to gears to me would be highway RPM and fuel mileage on the highway. My tires are only 31.5" (285/50r20) and with 4.56s on the highway, I would be turning about 2500 at 70mph. With my 3.92s I am just under 2000 rpm and I get over 18 mpg.

In the city I see no disadvantage to the gears.

Cam, disadvantage is dealing with custom tuning (not that big of a deal), and mainly finding someone to install it. But I would get increased performance and keep my fuel mileage on the highway.

Bad Habit · Jul 9, 2010

you wont turn 2500 rpm on the highway i can do 65 at 2000 cause thats as fast as my break in will allow me right now and i got stock height tires...and the gas doesn't suffer at all maybe at 85 or so the rpms will be up there but i will find out soon enough, everyone i talked to said my rpm range would be higher all the guys on here and....all said i would be fine im glad i listened to the guys on the boards....

glass3222 · Jul 9, 2010

I'm not thinking my fuel mileage will suffer much on the highway, but I'm sure it will some.

I am just not sure which I will benefit from the most.

rocket · Jul 9, 2010

Well I was on that path as well, But i get a nice cozy feeling at 1650, at 65 mph. But then I like height as well, level anyways. too each his own. I admire. your internal fortitude. with the break in period.Jjay. btw.

Silverbullet08 · Jul 9, 2010

i voted cam!! and im sure aaron could help you out in the install after hes done with mine

Off_Road_Teacher · Jul 9, 2010

My vote is for gears. They are both great mods but if I had the cash to do either one, I would do gears. And if you need someone to install the cam for you, I can do it for you.

truckin151 · Jul 9, 2010

glass3222 said:
Here are my thoughts on the advantages and disadvantages of each. Please let me know what you think.

The disadvantage to gears to me would be highway RPM and fuel mileage on the highway. My tires are only 31.5" (285/50r20) and with 4.56s on the highway, I would be turning about 2500 at 70mph. With my 3.92s I am just under 2000 rpm and I get over 18 mpg.

In the city I see no disadvantage to the gears.

Cam, disadvantage is dealing with custom tuning (not that big of a deal), and mainly finding someone to install it. But I would get increased performance and keep my fuel mileage on the highway.

Get the gears first....

My truck has 31.25" tall tires and at 70mph I'm squeeking by 2300rpms which for highway driving is where you WANT to be, thats where the best mpgs are at. There is no way you will be hitting 2500rpms at 70mph. Also I have been getting about 2mpg better all around after they were installed (30/70 City/HWY) so MPG's with the gears are not bad at all... DONT FEAR THE GEAR!!

Second, you will probably loose mpgs with the cam just because ofthe extra performance gains, tuning, adjusting the fuel trims to get you that perfect AFR etc. Not much but I would bet it either breaks even or drops a little.

Cost between the two will be about the same assuming that you dont take it to a shop to install the cam.

Third - WHY IS MPG EVEN AN ISSUE HERE????? Its a truck, a big heavy truck and you want to make it go FAST... Never quite understood why mpg is an issue when it comes down to making heavy trucks go faster.... But if you are that concerned about it neither of the two mods is going to drop you that much in mpg if they do at all as long as you dont get on it much, which is very hard to do.

glass3222 · Jul 9, 2010

Good points truckin. MPG are not a big issue, more of a side thought. I know I have a heavy truck, and I also have a heavy foot. But I would like to keep it close to what I am getting now.

KGBIGCOUNTRY · Jul 9, 2010

The price of either the gears or the cam will come out close to the same due to your being a 4x4. Gears are an install and break in then your set, where as the cam your gonna have to get custom tunes along with wideband and then a converter to get the most out of the cam. Your gonna be smiling either way you go.

ramhunter9 · Jul 9, 2010

gears hands down

Mega-Hemi · Jul 9, 2010

I'd do gears. Well, I am doing gears, as soon as I can come up with some cash. Had some but that ended up going for the ins. deductible on my bike. Maybe when I get back from my deployment. Should have some saved up by then.

Bad Habit · Jul 9, 2010

out of all my mods i have not been worried about mpg's they are just gonna be what they are i wanna have fun and my truck to fit my personality so if i have to cough up a lil more change i will....

glass3222 · Jul 9, 2010

jusjay727 said:
out of all my mods i have not been worried about mpg's they are just gonna be what they are i wanna have fun and my truck to fit my personality so if i have to cough up a lil more change i will....

OK. Disregard the MPG stuff, I think a cam and 4.56 will be about the same. So for my truck as my daily driver, which would you go with, which will give me better seat of the pants gains in performance and driveability.

Looks like 4.56 gears so far.

glass3222 · Jul 9, 2010

Off_Road_Teacher said:
My vote is for gears. They are both great mods but if I had the cash to do either one, I would do gears. And if you need someone to install the cam for you, I can do it for you.

Jason, thanks for the offer on the cam install. Aaron also said I could make a little trip to the 'burgh when he is there and he would do it.

I am just torn on which I would rather have.

Redtruck-VA · Jul 9, 2010

Gears! You are going to be very happy with the 4:56 gear.... I run 30.5 inch tires with a 4:10 gear and turn 2000 rpm at 65mph. I let myself get talked out of 4:56 gear and regret it..

Next Mod: 4.56s or KRC 210 cam

What should my next mod be?

4.56 gears

KRC 210 Cam

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