So i got around to buying some new shoes... Rode lone enough with the 245's on it..

These are the BFG mud's skinny but i like them 255-85-16's.... I got 60K miles out of my last set before i sold the truck so i hope i have the same luck....


Next mod a cam, or gears... havent made up my mind. I have 3:73's now but would liek a set of 4:56's... I tow a lot...

Stock tires and leveling kit



New tires,





Abby pointing out that after my mad buff job and wax that you can still see the scrapes from the tree... at least its not bright white anymore. Before it looked like you painted them on with white out lol

 

That looks good. I prefer a little wider tire myself, but your whole truck looks good.

 

I think I just pitched a tent. If I could modify our '02 Suburban, it would end up like that! Well done, the thing looks great and with the tall and skinnies I bet it performs just as well as it looks.

In my opinion, the 496 makes plenty of torque down low and would only guzzle the gas like a drunk with 4.56's. You're talking about cruising on the highway now with 3.73's at 2000 compared to 2450 with the 4.56's. 4.10's are all I'd do in addition to a tune to recognize the difference in tire height AND gear ratio.

 

Very ture, I havent hit the highway with the new tires. the stock tires are 30.1 inches says tirerack and the new ones 33.4 what i really wanted was stock 4:10 gears. I live in the mountains so everything is always up hill. anyway, I figured if i did 456's with these tires that would put it back to a 4:10.

When i changed the spedo on Hp tunes it said a 373 gear with 33.4 inche tire = a 3:4X rear end gear. Not sure how correct that is...

Our 6.0 truck has 4:10. It turns 3K at 80 mph.

 

Here's how it did the math.

(old tire height / new tire height) x (current gear ratio) = (what your gears feel like now if you were to have old tires back on)

(30.7/33.4) x (3.73) = 3.42. So what you feel now would be like if you had 3.42's with the old tires on.

That's kind of a ****-poor way of going after the situation but if you're comfortable with that analogy then I'll stick with it for this explanation.

If you want your truck to feel like it did before moving up in tire size, flip flop the ratio around.

(new tire height / old tire height) x (current gear ratio) = (gears you'd need to feel stock again)

(33.4/30.7) x (3.73) = 4.05. Closest available gear ratio to 4.05 gets you right at 4.10's if you want the truck to feel stock again with the big tires.

Since there is no gear set available in between 4.10 and 4.56 (like 4.27 or 4.30 for example) for your front 8.25" differential (assuming you are 4wd), you have a choice to make. 4.10's for economy or 4.56's for power. A compromise must be made, and only you can decide.

Personally, I prefer to under gear for economy and let cubic inches do what they do best down low.

 

Very true. I dont think there is a huge milage difference in the gears to be honest with you. Mom and dad have 07 denali and 09, they have 20"s yo with 3:42 gears and the 6 speed. they get 16 mph at 80. The truck, 6.0L 4x4, 4:10 gears and 245-75-16 tires gets 14 mpg at 80 (unloaded). I ve never ran the suburban on the highway unladed so i cant chime in on that. Ill have some numbers by saturday thought. We are going to Orlando.. 800 miles with two screaming kids....

 

put 300 miles on tonight. tires are grate. rpm has dropped. 80 mph is now 2000 rpms. 85mph is 2400 rpms 90mph 2800 rpms not sure how well that will work with 8K lbs behind it. we averaged 83 mph and i used a half take of gas which is about 18 gals so thats about 13.8 mpg! not bad for 496ci...

 

I think your speedometer might be off now. Have you recalibrated?

Simple math says if your speedometer was not fixed, it's reading 80mph but you're actually going 87.

 

lol... then i was really flying threw Flordia!!

 

The burb looks AWESOME now man!