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Discussion Starter · #1 ·
anyone know what the rearend is in the 300c I want to change the gear out

can the speed shops calibrate them too

JKetron
 

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jketron said:
anyone know what the rearend is in the 300c I want to change the gear out

can the speed shops calibrate them too

JKetron
I believe the gear set is a 2.73, and I don't believe there are any options out there for us yet as far as swaps go. Unless of course you know something we don't :)
Joey Molnar
05 Silver 300C
14.0 @ 99
01 Dak R/T
13.7 @ 98
 

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Our LX's (C's and RT's) ratio is 2.82, and true, there are no options at this time. The V-6 models have a completely different differential, as does the all wheel drive C's and RT's. They are all interchangeable and come in ratios from 3.08 to 3.90, with the 3.90 coming in the 2.8 liter vehicles. I believe the 3.5 liter vehicles come with a 3.64 and the all wheel drives come with 3.08's. Those with AWD C's and RT's could put in 3.90's, but I'll bet the cost would be as much as a supercharger.
 

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Discussion Starter · #4 ·
I'm putting a SuperCharger on mine this week and I want to re-gear it. I have a 3.06 now and I would like to see 3.55. I need to know what the rear end is..e.g. Dana 44...ect


Something like that

JKetron
 

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jketron said:
I'm putting a SuperCharger on mine this week and I want to re-gear it. I have a 3.06 now and I would like to see 3.55. I need to know what the rear end is..e.g. Dana 44...ect


Something like that

JKetron
Ive been trying to find out what kind of rear end the 300c/magnum r/t has also, i would like to get a posi unit in my magnum, tired of the 1 wheel wonders. Let me know if you find anything, ive asked the techs at my dealership and they dont know what kind it is. it also doesnt tell me any info in our parts catalog.
 

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magnuman said:
Our LX's (C's and RT's) ratio is 2.82, and true, there are no options at this time. The V-6 models have a completely different differential, as does the all wheel drive C's and RT's. They are all interchangeable and come in ratios from 3.08 to 3.90, with the 3.90 coming in the 2.8 liter vehicles. I believe the 3.5 liter vehicles come with a 3.64 and the all wheel drives come with 3.08's. Those with AWD C's and RT's could put in 3.90's, but I'll bet the cost would be as much as a supercharger.
Thanks for the correction magnuman. :)
 

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I was looking in the shop manual tonight and I stand corrected on the AWD vehicles. It looks like you CANNOT interchange gears on the front axle, because it has a 175MM diameter ring gear, and the rear is a 198MM. Also looks like no "posi" is available for any of them. So, I guess we're all out of luck, for now anyway.A few quotes from the manual:
"The 175MM FIA Axle is available only in All-Wheel Drive models, and only in a 3:07:1 ratio."

"The 210 MM axle is available only in V8 engine-equipped models with a 2.82:1 gear ratio."

The 198MM differential is used on all sixes and apparently on the rear of the AWD vehicles.
"The 198 MM RII (Rear-Independent-Iron) axle is an independent assembly with a cast iron housing and differential."
"The 198 MM RII (and the 210 MM) uses an open differential which is supported by two tapered roller bearings located on either side of the case. Differential bearing preload and ring gear backlash are controlled with select snap-rings located on the
outside of the differential bearing cups. Pinion height is set with a select shim located under the rear pinion bearing cup."
 

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The SRT8's rear end has a limited slip in the rear end of it... Probably going to have a place custom machine a set of gears for it... It is a Mercedes rear end...
 

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The SRT8's rear end has a limited slip in the rear end of it... Probably going to have a place custom machine a set of gears for it... It is a Mercedes rear end..

Where did you find this?
From all I have seen the SRT8's will have the same open differential as the RT, just a different gear.
 

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Check "E" Class Mercedes

HaTaX said:
The SRT8's rear end has a limited slip in the rear end of it... Probably going to have a place custom machine a set of gears for it... It is a Mercedes rear end...
Gang,

Since this car is all Mercedes has anyone checked the shop manual of the "E" Class Mercedes?
 

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That might help, but don't consider it definitive. Even if it does not show one, that dose not mean the SRT team could not have had one done up for it. I'm know the truck trans that that was the base for the SRT-4 trans didn't have one. SRT got Quaiffe to make one.

The darn press releases always refer to an "upgraded differential" with no exact mention of anything beyond the higher gearing
 

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Discussion Starter · #13 ·
I light both tires on my SRT8
 

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What's this about?

I light both tires. Power braking makes two nice long, equal patches.

Am I missing something?

No way an SRT8 is turning 13s without some form of posi.
 

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In the 300C and RT cars the rear brakes create posi-traction. The computer will apply brakes to which ever rear wheel that is spinning faster than the other. It tries to keep the back tires spinning at close to the same speed.
Easy way to tell is to pull the traction control fuse and play a little. Turn right or left and spin the tires. If only on spins it's an open differential.

It's probably better than mechanical posi units for 1/4 mile times. There’s no extra internal power drain from the drive train when you don't need it.
But it sure isn't as fun to drive as a LSD unit.
 
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