[Darkknight3829]

4.30 would be a no-brainer, but that's not an option for a Chrysler 9.25 diff.
It all comes down to the number of teeth on the pinion in relation to the number of teeth on the ring gear.

as a result I'm afraid I'm faced with settling for 4.10's
or going to 4.56's and needing to buy 4 new DR's that sit about 29"-30" tall.

The key is definitely to stay out of 4th gear before hitting the traps.

I cant do any track testing or detailed calculations until I get back to the track,
I need to know my exact RPM's at the line but our track doesn't open until April 27th.

My effective gear ratio with 3.55's and 27" DR's is about 4.30:1
I believe I'm 4400-4600 rpm in 3rd gear, but not 100% sure.
If I can get to 5800 in 3rd with 4.56's and my current tires, that will be the determining factor.

If I'm wrong and I shift into 4th. I'll be in overdrive at 3000 rpm at the traps, and have to shop for new tires.

I may scrap the entire gear swap and just add a rear LSD, then spray it
Why struggle for mid/low 13's when I can get 12's for less $$$.

I found a 4.10 rear end setup for 1200$ on the online mopar store. Went by the dealership to confirm what exactly it was that I would be receiving because it seemed cheap. And turns out to be everything you need for a gear swap. 1200$ aint bad. Im running 3.55s as well. I plan on swapping to 4.10s as my last mod on my truck.

I run the exact same tire as you when at the track. MT drag radials. just a different wheel.

Now that i saw those wheels (Your track wheels) on your ram. I may have found the set of wheels ive been searching for to put on mine :smileup:

 

[Darkknight3829]

Also what program will they be using to do the custom tune on the Dyno? That is what i was going to do but a buddy of mine from the performance shop said the program has not come out yet. I believe he called it the HP TUNE

 

[Darkknight3829]

Does that include the LSD as well or is that just the gears, I'm a slight newb to this whole rear diff thing, I want to swap out the 3.55's for the 4.10's with a limited slip so I'm not peg legging it anymore.

Exactly..
It's the entire R/T rear axle assembly, all ready to bolt in. Just have to transfer rotors, brakes i believe. So you wont peg leg it anymore with the 4.10 setup. The 4.10 comes on the R/T. Thats why he is saying its the R/T package. The 3.92 is an option on regular Ram 1500's. I think some 1500's come with a 3.72 (Dont catch me lying i am unsure of this)

 

[Darkknight3829]

Good deal,
I remember looking into that 4.10 rear diff shortly after getting my Truck,
unfortunately the shipping to Canada would negate any savings,
and I've still got a front diff I'd have to match.

I'm looking at $1800 parts (Gears,Locker, bearings etc.) Front and Rear
and about $1500 in labor :158:

Diablo Tuners use Chip Master Revolution software (CMR)

Link: http://www.diablosport.com/index.php?module=htmlpages&func=display&pid=8

Oh yea haha shipping plus labor would kill you. Didnt take that into consideration. Since the mopar dealership is here I can just pick it up an do the install myself when i get around to getting myself the 4.10's.

Wow i was never introduced to this before. Am i seeing this right. 2500$? Or does the performance shop your going to already have this? That is pretty cool. I didnt know of this program.

 

[Darkknight3829]

swapping out the 3.55's for any other gearing upwards is a no brainer... doesn't make sense to mod everything else when the gearing should be a part of the list...

Gearing is the last on the list. Because of $$$ & the time it will take me to do the install myself

Definitely a MUST If i want to reach my goal or rather have a complete build.

 

[Darkknight3829]

haha ok cool. cant wait to see it! where you gettin your trutrac from?

 

[Darkknight3829]

In order to get gears,lockers and labor all under warranty it has to come from the same local shop,supplier.

otherwise if there's a massive failure no one would claim the failure was their fault while your stranded with a broke-ass truck.

I've dealt with two local supplier/installers for many of my Jeeps,
will be shopping them against each other for the best deal.

Yea your right.

Thats why you have to always keep your original parts!!:smileup:

It breaks put your 3.55 gears back on. Of course 1800$ is NOT easy to swallow. So getting it covered under warranty may be a good route. just a lot more $$$ but worth it IF and only IF it breaks.

 

[Darkknight3829]

The rear end is from Mopar. You shouldnt have to worry about warranty. It should be indestructible! :bsflag:

Haha. I understand what your saying.

 

[Darkknight3829]

OK ok im on track with it now. I was under the impression we were talking about getting your gears from mopar and your trutrack from somewhere else. And having a shop do the work. But i follow you now. Thats pretty good you found everything at one shop. I cant wait to see how you do in the 1/4 mile. compared to your 3.55 gears.

 

[Darkknight3829]

I was just making a joke about mopar if you had gone with their 4.10 gears lol