Not knockin 4:56s cuz ive never ran them just saying what ive heard and read.

Hows your truck on the interstate as far as rpms?

 

around 2450 @70mph with 30" tires

i'm around ~5000ish in 3rd goin through the 1/8th i think...i would swear to that though

 

I have 4.56s with 35s and its awesome. I turn about 2300rpm at 75mph. I will say, since ive added the blower, I have too much gear IMO and would be better suited with 4.10s.

 

what RPM are you trapping at with 4.56 and nitrous? what size tire are you using when spraying?

 

dude i have no idea...around 5000ish in 3rd through the 1/8th i'd say with a 28" slick

 

I love my 4.56s and im a 4.8 cammed an stalled and im still gettin around 17-18 on the hwy crusin at 65mph around 2400 rpm with a 28 inch tall tire

 

im glad i didnt go with 4:10's, i would have been dissapointed. the 4:56 was perfect for my current and future set-up.

 

I love my 4.56's! I have 29.7 inch tires and with my speedo calibrated with a GPS, my data logger shows i'm runnin 2600 rpm at 70 mph. The gearing seems perfect for a cammed 5.3. I would imagine they would not be at all too much for a cammed 4.8!

 

I was running 4600 through the traps in the 1/4 mile with 3.73's and 28" slicks, I just did a 4.56 swap. I still won't be at the top of my RPM band in 3rd at the end of 1320, but it will be a lot better then it was. I tach 2500 @ 70 on the interstate. If I had it to do all over again I wouldn't change anything...

Here is a good calculator for figureing MPH at given RPM.

http://www.race-cars.net/calculators...alculator.html

 

US Gear

get the 228 or get one custom spec'ed, up the stall at lease 4k make that 4.8 proud of ya