Rear end swap

[charger35v6]

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

[Galvatron-SX]

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.

[charger35v6]

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?

[Galvatron-SX]

If you want to PM me your VIN, i can find out what rear end ratio your car has.

[NYC SRT8]

Originally Posted by charger35v6

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?

[Galvatron-SX]

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....

[charger35v6]

That would make sense. I'll email diablo sport to confirm that.

Galvatron-SX, I pmed my VIN to you

[x111103]

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.

[RichmondDJs]

If you can get up under your car and see the tag on the diff it will say what it is.

[charger35v6]

Thanks. I found out the other day. I have 2.87 so the 3.06 would be a nice upgrade without sacrificing gas mileage