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post #1 of 15 Old 11-28-2012, 11:54 PM Thread Starter
charger35v6
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Rear end swap

I know this has been posted before, but the search on this site is horrible plus I want to find some up to date information.

First question: is swapping my differential out with a differential from an srt8 a worth while swap? I want better torque but don't want to murder gas mileage.

Second question: with the predator, is that gear ratio even an option?

Third question: any successful swaps? I know there was a thread with a guy in NY who did a swap but he used the getrag. And last I remember, it was never updated after he got the swap done and was working out some bugs.

Thanks in advance
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post #2 of 15 Old 11-29-2012, 10:23 AM
Galvatron-SX
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You can change the computer with the Predator, but I think only with the 5 speed automatic. Do you have that?

Also....you might want to check and find out what gear ratio you already have. I remember my V6 Challenger that had the 4 speed came with a 3.64 rear. Anytime you go with a lower gear (numerically higher), it WILL affect your gas mileage, just so you know.
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post #3 of 15 Old 11-29-2012, 11:27 AM Thread Starter
charger35v6
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I have the NAG1 tranny. Have the predator.

Does anyone know what gearing I have? My car was made in July 2007. I have read so many different answers its amazing. I was hoping Samoan tsunami was still hanging around to get some info.

I guess I should clarify on the predator question...basically I'm trying to find out if the srt 8 gear ratio is preloaded? I swear I've checked before in it but it only had 3.07 not 3.06. If it is, anyone know if its better to use that or get a custom tune set up?

2007 Black Charger, 3.5 v6. AEM brute force air intake, custom dual exhaust (AP Mufflers), Powerslot Slotted rotors, Diablosport tuner In the works: Full Coilovers (Megan Racing) Eibach Sways, Razors Edge Endlinks/Bumpsteer, DC Sports tower brace and wheels. In the future: Inertia cams, ported TB, and JBA headers
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post #4 of 15 Old 11-29-2012, 11:40 AM
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If you want to PM me your VIN, i can find out what rear end ratio your car has.
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post #5 of 15 Old 11-29-2012, 12:49 PM
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Quote:
Originally Posted by charger35v6 View Post
I have the NAG1 tranny. Have the predator.

Does anyone know what gearing I have? My car was made in July 2007. I have read so many different answers its amazing. I was hoping Samoan tsunami was still hanging around to get some info.

I guess I should clarify on the predator question...basically I'm trying to find out if the srt 8 gear ratio is preloaded? I swear I've checked before in it but it only had 3.07 not 3.06. If it is, anyone know if its better to use that or get a custom tune set up?
My car's got the Getrag 3.06 (among other things) done by the previous owner and I too noticed the Predator has no selection for 3.06??? WTF?

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post #6 of 15 Old 11-29-2012, 12:59 PM
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Because I THINK the actual number is 3.069, so they call it 3.07...I'm not 100% on this, but that's what I believe. Similar to the debate of whether it's 3.91 or 3.92....
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post #7 of 15 Old 11-29-2012, 01:09 PM Thread Starter
charger35v6
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That would make sense. I'll email diablo sport to confirm that.

Galvatron-SX, I pmed my VIN to you
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post #8 of 15 Old 11-29-2012, 01:30 PM
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I've done the swap. I used the 3.07 ratio in the Predator with no issues.

I know this may seem contrary to most people's thinking but I saw an increase in mpg. The higher gears caused MDS to come on a lot faster than it used to and it stays on a lot longer than it used to. I've had MDS stay on while climbing a slight incline where before it would have kicked off as soon as any extra load is put on the engine. I am one of those guys that uses cruise control a lot too. I have a long highway commute to work every day so cruise control gets used.
I can say that I do get a lot more snap off the line and that by itself has made the swap worth it all. I can roast the tires a lot easier than before.

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post #9 of 15 Old 12-01-2012, 12:09 PM
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If you can get up under your car and see the tag on the diff it will say what it is.
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post #10 of 15 Old 12-01-2012, 01:28 PM Thread Starter
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Thanks. I found out the other day. I have 2.87 so the 3.06 would be a nice upgrade without sacrificing gas mileage
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