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Old 07-24-2017, 01:34 PM   #1
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4.56 swap

Well my engine isn't even broken in yet and I'm already planning my next mod. I've had a lot of people suggest 4.56 gears so I'm planning on doing it. I have two things holding me back, installation and highway mileage. I know, someone is gonna say "if you're worried about mileage buy a Prius" and that's very true. I just tend to drive a good bit of highway for my work, I'm a union electrical apprentice so I truly never know where my next job will be located. Also I don't like paying a shop an arm and a leg to install things I can handle. But I would also not enjoy screwing up my rear end. So my plan is buying a used rear end off a parts truck and changing the gears on the bench. I'll put that rear end in to see how I like the gears, and how bad my mileage gets. If I ultimately decide it's not worth it for me (which probably won't happen) or if I mess up terribly, I will still have my intact 3.92 rear end to put back in. If I end up loving it, I'll order another set of gears for my front end and tackle that. I plan on doing the rear first to be sure I like it, then the front. I did some calling around on a bunch of Craigslist posts and saw prices from $500-$800, but finally found a guy who said $100. So if it works out this weekend I'll try to drive out and pull it out. So any input? Will going from 3.92 to 4.56 be that big of a difference?

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2003 QCSB "The Mutt"-392 Manley Stroker-Inertia Cam
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46RE-CRT Billet Manual Valvebody-Edge 3200 convertor
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Old 07-24-2017, 02:01 PM   #2
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What size tire do you run?
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Old 07-24-2017, 02:33 PM   #3
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Quote:
Originally Posted by ric3xrt View Post
What size tire do you run?
Stock 33's, on a 2" level on the front
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Eagle Heads and Intake Manifold-
46RE-CRT Billet Manual Valvebody-Edge 3200 convertor
4.56 and Detroit TruTrac-Custom Morimoto Projector Headlights
Tuned by Charged392
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Old 07-24-2017, 06:55 PM   #4
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You will feel a diff! Ask Ariel he was grinning ear to ear when we did his on his 35s. As for mileage loss it's minimal don't worry about that.
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Old 07-24-2017, 06:58 PM   #5
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Quote:
Originally Posted by YeahItsAHemi View Post
Well my engine isn't even broken in yet and I'm already planning my next mod. I've had a lot of people suggest 4.56 gears so I'm planning on doing it. I have two things holding me back, installation and highway mileage. I know, someone is gonna say "if you're worried about mileage buy a Prius" and that's very true. I just tend to drive a good bit of highway for my work, I'm a union electrical apprentice so I truly never know where my next job will be located. Also I don't like paying a shop an arm and a leg to install things I can handle. But I would also not enjoy screwing up my rear end. So my plan is buying a used rear end off a parts truck and changing the gears on the bench. I'll put that rear end in to see how I like the gears, and how bad my mileage gets. If I ultimately decide it's not worth it for me (which probably won't happen) or if I mess up terribly, I will still have my intact 3.92 rear end to put back in. If I end up loving it, I'll order another set of gears for my front end and tackle that. I plan on doing the rear first to be sure I like it, then the front. I did some calling around on a bunch of Craigslist posts and saw prices from $500-$800, but finally found a guy who said $100. So if it works out this weekend I'll try to drive out and pull it out. So any input? Will going from 3.92 to 4.56 be that big of a difference?
-------------------------------------
BEST single mod ever IMO is 4:56's. I'm using the Detroit Tru-Trac with the Motive 4:56 gears in a 4x2 running SRT10 / 22's with a circumference height of 33". It completely woke the heavy Quad Cab up and also allowed it to get into the most efficient cruising RPM range - contrary to popular belief the Hemi is a turd at low RPM's and needs to get into it's power band to perform .
My 2 cents worth ,

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Old 07-24-2017, 07:34 PM   #6
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Ok that's what's been confusing in my research. Most people ASSUME you will tank your mileage on the highway just because it's a low ratio, but don't take into account the hemi powerband. That's why I couldn't decide for sure. But now I'm realizing the rear end I would be buying probably isn't a limited slip like mine. So I would probably have to buy a locker right? That would be another exspense
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Eagle Heads and Intake Manifold-
46RE-CRT Billet Manual Valvebody-Edge 3200 convertor
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Old 07-24-2017, 07:44 PM   #7
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The 4:56 gears made a huge difference. I could easily do a nice burn out with my 35's now.
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Old 07-24-2017, 08:19 PM   #8
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Quote:
Originally Posted by RAM4 View Post
The 4:56 gears made a huge difference. I could easily do a nice burn out with my 35's now.
Well short of the supercharger your is a pretty identical build to mine so I'm sure you would know. What gears did you have originally?

And to be fair, I could do a pretty sweet burnout before haha
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2003 QCSB "The Mutt"-392 Manley Stroker-Inertia Cam
Eagle Heads and Intake Manifold-
46RE-CRT Billet Manual Valvebody-Edge 3200 convertor
4.56 and Detroit TruTrac-Custom Morimoto Projector Headlights
Tuned by Charged392
Tons of Pics https://www.flickr.com/photos/[email protected]/albums
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Old 07-24-2017, 09:33 PM   #9
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Mine came with 3:92 gears.
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Old 07-25-2017, 10:05 AM   #10
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Is there a way to visually see if the gears are open end or limited slip? If it's an open diff, you you have to install something else?
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2003 QCSB "The Mutt"-392 Manley Stroker-Inertia Cam
Eagle Heads and Intake Manifold-
46RE-CRT Billet Manual Valvebody-Edge 3200 convertor
4.56 and Detroit TruTrac-Custom Morimoto Projector Headlights
Tuned by Charged392
Tons of Pics https://www.flickr.com/photos/[email protected]/albums
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