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Discussion Starter #1
Need input from SRT-8 owners
What rear gear do you have?
Do you have LSD or open differential?
I have been hearing a lot of people talking about the SRT-8 having a mechanical posi unit. But the only evidence I get is "it spins both tires"

Has anyone pulled the #17 fuse or lifted teh car and spun one tire by hand to confirm or denie the aligations?
 

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I don't own a SRT-8 but I was wondering the same thing about my C.

I've had AWD cars in the past and all of them had a mechanical LS in the rear.
Wonder if my AWD has the same or does the ESP do the limiting by applying one of the brakes when it detects one of the tires starting to spin.

By the way all of past AWD cars had a sticker on the drivers side door jam stating that this car is equiped with a LS in the rear so be carefull...yada yada yada but the C does not have a sticker.

Anyone know?
 

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I own a 06 srt8 and have been asking service techs about more agressive gearing. I think the cars electronic stability control will keep one wheel from spinning too much. At least thats what it feels like.
 

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There's not much info out there yet. At least none that I can find.

All I do know is it leaves two beautiful patches of black ribbon on the pavement, and the traction control/ESP works great at keeping the wheels from spinning out of control in the twisties.
 

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Discussion Starter #5 (Edited)
seth,
Have you done any burnouts? (I hope)
You are right, part of the traction control system will keep the rear axle pulling posi just like the other LX cars. I'm interested to see if an increase in power and traction effects the performance of acceleration traction control.
Does the SRT-8 have an ESP button to partially disable the system (like the 300C)?
One more what gears do the SRT8 have? What are the rpm's at 60?

Thanks,
I am thinking of trading my Magnum RT in on a Charger RT with the performance group. I sure would like to swap the rear end for a SRT-8 gear if possible.
 

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I'm really surprised nobody has had the rear end on jacks and spun the tires to really see if there is a mechanical LS out back.

I messed up last weekend when I had the cars tires balanced (they were pretty far out from the factory) because the car was on a lift and all four wheels were off the ground and I could have checked then but it didn't cross my mind.
 

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Well guys and gals I found the answer to some of these ?

First off is there is NOT a mechanical LS in any of the 5.7 C cars. The rear is a Benz based 8.3" ring gear, open 2 pinion diff. cast iron pumpkin and the gear ratio is 2.82:1 and IRS of course. It seems all of the "limiting" is done via ESP.

And as some of you already know there is not any different gear ratio available at this time.

The source of this info claims that this diff lives behind the 5.7 HEMI because of the torque management which basically backs down the torque between shifts.

Not sure if this applies to the SRT-8's though.
 

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Hmm, we do know the SRT has different ratios, 3.08:1, maybe? 3 something, in any case. Now, if anyone has watched the super cool (yeah, I"m biased, bite me:)) video on Dodge.com in the "unleashed" section, where the Charger and SRT-8 Charger race through an amusement park, the beach scenes seem to show the SRT throwing two rooster tails in a turn in the sand.

Traction/ESP? I don't know. But I DO know that Quaiffe was a prominent sticker on the right rear fender of the One Lap SRT-8 300C
 

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Discussion Starter #10
"C"Bandit
I think we all now about the 300C and RT rears. They are open diffs. with 2.82 gears.
The big question is what is different about the SRT-8 rear end. There price and build web page says the 300 SRT-8 has a 3.06:1 rear axle ratio. But all the promotional stuff stats that the SRT-8 gets an upgraded rear axle. Is the gear change the "upgrade" or are there other differences. They don't say anything about LSD so I'm sure it doesn't have that.
And the more important question, will a SRT-8 rear swap with the a 300c or R/T. I know the computer would have to be modified for the gears, but if it was a bolt in replacement I'm sure that someone would figure it out.
 

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maneval69 said:
"C"Bandit
I think we all now about the 300C and RT rears. They are open diffs. with 2.82 gears.
The big question is what is different about the SRT-8 rear end. There price and build web page says the 300 SRT-8 has a 3.06:1 rear axle ratio. But all the promotional stuff stats that the SRT-8 gets an upgraded rear axle. Is the gear change the "upgrade" or are there other differences. They don't say anything about LSD so I'm sure it doesn't have that.
And the more important question, will a SRT-8 rear swap with the a 300c or R/T. I know the computer would have to be modified for the gears, but if it was a bolt in replacement I'm sure that someone would figure it out.

I always thought the drivetrain from the trans back was the same except for the ring and pinion ratio. I may be wrong and hopefully so...

...but to answer your question it's a general rule of thumb that on shared platform cars parts should bolt right up in replacement without needed any custom fabbed parts. Time will tell once you can actually purchase these components.
 

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vvv90 said:
I always thought the drivetrain from the trans back was the same except for the ring and pinion ratio. I may be wrong and hopefully so...
Tech Info:

Your hopes are fullfilled. The SRT8 has upgraded drive and half shafts, and the diff, from a Mercedes E500

Zilla (old elephant memory)
 

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goddardzilla said:
Tech Info:

Your hopes are fullfilled. The SRT8 has upgraded drive and half shafts, and the diff, from a Mercedes E500

Zilla (old elephant memory)
Well lookie there. Thanks Zilla.

Personally I don't see why anyone in a C would consider it unless they're doing a supercharger or something drastic. Otherwise, we've already heard that the Quaiffe is better.
 

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VV, what have you heard about a Quaiffe? I'm assuming it was before I stowed away in the trunk here:) Cliff notes, please?
 

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I'm in the same boat you guys are.

I've heard nothing.

Other than the rumors or hearsey (if it's only that) that a quaiffe diff was used in the lap of america car and might be used in future production models.

That's all.
 

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maneval69 said:
"C"Bandit
I think we all now about the 300C and RT rears. They are open diffs. with 2.82 gears.
The big question is what is different about the SRT-8 rear end. There price and build web page says the 300 SRT-8 has a 3.06:1 rear axle ratio. But all the promotional stuff stats that the SRT-8 gets an upgraded rear axle. Is the gear change the "upgrade" or are there other differences. They don't say anything about LSD so I'm sure it doesn't have that.
And the more important question, will a SRT-8 rear swap with the a 300c or R/T. I know the computer would have to be modified for the gears, but if it was a bolt in replacement I'm sure that someone would figure it out.
Well then I thought that no one had that info yet...guess I was wrong :nutkick:

I would think then that the SRT's rear would function in the same manner, ie no mechanical LS also.

Does anyone know if the AWD C's still use the same rear diff as the RD C's ?
 

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The rear differential in the 300C AWD is the 198 mm (7.8") with a 3.07 ratio . This rear
(198mm) is also used in the 3.5L and the 2.7L Chrysler 300 with ratios of 3.64 and 3.9 respectively. Although the ratio for the AWD and the SRT-8 are the same, I doubt that they are the same units. I would think that the 198mm unit is not strong enough to survive the larger torque of the 6.1L SRT-8 engine. If they are the same, the SRT-8 version must have a gear set with superior strength.
 

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