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Which Differential Do I Have?

Old 06-06-2009, 05:17 PM
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Red face Which Differential Do I Have?

OK let's start with, I have an R/T with Auto and 20" rims. From everything I've been reading on this and other forums, plus Dodge.com and Motortrend I'm not sure what happened to my car. Everyone seems to agree that the R/t Auto w/20" rims came with the 3.92 open rear end. Manuals got the 3.92 Posi (limited slip, anti-spin, whatever) and the Auto w/18" rims got the 3.06 open rear end. Hope I'm right so far??? Now please tell me why my car when doing burn outs and power stands, dry or wet pavement (even burnout box) I leave behind two smoking tracks on the ground? I've been a mechanic for some 28 years and I used to drag race. Now in my book this would tell me that someone has a posi/limited slip read end. If I'm not crazy then how might this have happened. No I'm not complaining just confused. In addition it makes no difference if the ESP is on or off, or if I'm in drive or 1st. Of course with the ESP on the burnout is limited but it does try. Any ideas on this one???
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Old 06-07-2009, 07:44 AM
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You without a doubt....10000000% for sure....with no questions, have the 3.06 open rear end (non limited slip). The RT auto's only got that rear....nothing else. I have the same car. 09RT with auto and 20" chrome rims. The auto is the only model out of the RT's and SRT's to no get a limited slip or deeper gears. If you are not into drag racing your rear will be fine and spin both wheels. But once you put on sticky tires, only one wheel will spin. I alsways spun both wheels, even doing burnout with no problem. But once I pust sticky tires on it, only one would spin. Just jack your car up and spin one wheel.....the other one wont spin. These means open rear.

I recently swapped my rear for a 3.06 Getrag with the limited slip out of an 09 SRT8 Challenger. That made a huge difference.

Last edited by 10secDodge; 06-07-2009 at 07:46 AM.
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Old 06-07-2009, 08:14 AM
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Thanks, I guess I was hoping someone screwed up on the assemly line maybe.
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Old 06-07-2009, 08:32 AM
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Originally Posted by 18forever View Post
Thanks, I guess I was hoping someone screwed up on the assemly line maybe.
I know what you mean. When I first got my car I thought the same thing since I could spin both tires. I thought that all the way until I did my first burnout with drag radials. My buddy goes "dude, there's something wrong with your car...only one wheel is spinning".

If you ever get the urge, the rear swap is pretty easy.
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