Opinions on Axle Ratio for FI

[nycstev]

Just to recap... I decided against modifying my QC . I thought it was just to new and would rather let it "sit " for a while and let my wife drive it. Sort of like a family car.
Instead I bought a slightly used RC where warranty is not really relevant. Something that lends itself to mods more readily and can be taken apart etc..

So i'm gathering parts. SC's Clutches, hydraulics, traction stuff... Building up the "infrastucture".. I believe in a solid foundation. Now Im turning to the rear axle and Im sorry I missed the group axle buy! That was some deal!

Since this truck will have FI, I have been studying Before and after dyno results. It seems to be pretty clear that power and torque increases are substantial across the entire rpm range. . Given alot of the problems with hooking up and alot of SC'ed 14 sec cars I have been hearing about has anyone with FI gone up to a 4.10 axle?
My plans for this vehicle DONT include breaking any 1/4 mile times or land speed records... just basic street strip fun, highway driving etc...

TIA

Steve

 

[Dominick572]

You can still get it, just not for the original price...Its a little more now. PM Stinker he'll set you up man.

 

[SANCHOBA]

from what i have been reading, 4:10s' for FI and 4:56s' for NA...i'm still saving for my 4:56s', want to swap?:idea:

 

[nycstev]

Im not looking just to swap gears.. Im looking to "beef" eveything up with a complete new DL rear. In the process investigate the Axle ratio. Would lke to hear from people who have SC their vehicles and have their opions on what final drive gear they would use.

S:dontknow:

 

[Django]

Jack once told me that 4:58s on my truck would neccessitate shifting into 5th before the end of the quarter mile...

Yes....?

Django

 

[nycstev]

Jack once told me that 4:58s on my truck would neccessitate shifting into 5th before the end of the quarter mile...

Yes....?

Django

So you have 4.10's now D?

 

[nycstev]

Sorry I didn'notice you havd 04.. so 4.10 is stock:idea:

 

[Dave T(BADVENM)]

Eventually I'd like to beef up the back end of mine as well...especially if I really wanna get serious with the truck. The horsepower is fine for now but if I go for more I'll need to upgrade (probably will be my next mod) the rear end and its components. Last thing I want is a yardsale of parts all over the race track.

 

[Nowwhat]

you want the 4.56s.....:rock:

 

[FSTJACK]

Jack once told me that 4:58s on my truck would neccessitate shifting into 5th before the end of the quarter mile...

Yes....? Django

Tim that was with a 28.5" tall tire (Nitto Drag radial)
6000RPM, 4.56 Gear = 110.39MPH

With the 31.5 drag slicks (M&H nostalgia drag slick)
6000RPM, 4.56 gear = 122.31MPH

With a 33" Hoosier drag slick
6000RPM, 4.56 gear = 127.61MPH

Those calculations were made before we had the M&H tire available, or the ability to put a 33" tall tire on the rear. This has come about with the advent of shaving calipers and building complete rear ends.

At the time we originally calculated it out, a 4.10 gear was all you could run with the horsepower you have.

How things have gotten better over the last couple years for us all.

Some of the newer folks don't realize the grief that some of us went through to get the combinations and solutions worked out.

Why I think even vaguely recall of some bold crusader that even removed his rear brake calipers when he went drag racing to get his 16" rims and drag slicks on his truck.

 

[JTS VENOM PERFORMANCE]

somehow or another I ended up with 4.56's Steve hella fun on the street, even feels better jst toodling around.

but with the 33 hoosier i have in the garage, i should hopefully bang the mark, but my RPM limiter is raised a tad also , higher than stock

 

[includemeout]

Change the first gear in the tranny, then you can tow easelly with an RC
And get out of the hole

 

[nycstev]

Change the first gear in the tranny, then you can tow easelly with an RC
And get out of the hole

huh?

 

[Silverback]

Tim that was with a 28.5" tall tire (Nitto Drag radial)
6000RPM, 4.56 Gear = 110.39MPH

With the 31.5 drag slicks (M&H nostalgia drag slick)
6000RPM, 4.56 gear = 122.31MPH

With a 33" Hoosier drag slick
6000RPM, 4.56 gear = 127.61MPH

Those calculations were made before we had the M&H tire available, or the ability to put a 33" tall tire on the rear. This has come about with the advent of shaving calipers and building complete rear ends.

At the time we originally calculated it out, a 4.10 gear was all you could run with the horsepower you have.

How things have gotten better over the last couple years for us all.

Some of the newer folks don't realize the grief that some of us went through to get the combinations and solutions worked out.

Why I think even vaguely recall of some bold crusader that even removed his rear brake calipers when he went drag racing to get his 16" rims and drag slicks on his truck.

"....bold crusader..."? I had a different name for him.

 

[nycstev]

So it looks 4:56 going once.... twice....:burnout:

 

[Riff62]

"....bold crusader..."? I had a different name for him.

Was that bold or bald crusader..:dontknow:

Musta been a booger on my screen,,,

 

[Silverback]

Was that bold or bald crusader..:dontknow:

Musta been a booger on my screen,,,

Yep, clean your screen.

You did however make me look. :rock:

 

[nycstev]

Cmon .. im Looking for technical stuff here....is it 4:10or 4:56?

 

[BigRed460]

Every one I can think of has 4.56, prof would be the one to ask...

 

[ViperTruck2933]

If you are going to be under 800 rwhp, I'd go 4.56.

Over 800 rwhp I'd go to 4.10s.

I swapped my complete 4.10 rear end for Justin's 4.56s.