3.92 manual RT differential - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #1 of 29 (permalink) Old 04-09-2019, 01:51 PM Thread Starter
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3.92 manual RT differential

I have a 2014 manual Challenger RT and my differential just went out, I have a 3.92 ratio. I’ve been looking for a replacement and notice that there are SRT8s with a 3.92 gear ratio as well, I’ve notice they are automatics, I was wondering if it would work? And if it’s better that the RT? Should I get one from an SRT8 or one from an RT?
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post #2 of 29 (permalink) Old 04-09-2019, 01:56 PM
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I've not seen the 3.92 in an automatic from the factory. With the way the auto is geared (which is why the 3.06) she would be screaming on the highway.

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post #3 of 29 (permalink) Old 04-09-2019, 02:02 PM
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The SRTs with A5 automatic up thru 2014 used a 3.06 ratio. The 3.92 on Challenger was only used on M6 cars with 20 inch wheels, M6 cars with 18 inch wheels used a 3.73 ratio.

The only cars to use an A5 with a 3.92 far as I know was the 2011 Mopar 11 Charger and the 2012 Mopar 12 Chrysler 300.


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post #4 of 29 (permalink) Old 04-09-2019, 06:31 PM Thread Starter
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The SRTs with A5 automatic up thru 2014 used a 3.06 ratio. The 3.92 on Challenger was only used on M6 cars with 20 inch wheels, M6 cars with 18 inch wheels used a 3.73 ratio.

The only cars to use an A5 with a 3.92 far as I know was the 2011 Mopar 11 Charger and the 2012 Mopar 12 Chrysler 300.

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Yes you are right, those are the cars I’ve seen, but will the differential from those cars (300 and charger) work for the manual challenger? Would they be stronger since they are for SRT8? I’ve checked at some junk yards and they told me they were different that didn’t didn’t interchange.
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post #5 of 29 (permalink) Old 04-09-2019, 06:44 PM
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They will work. All 3.91s (the actual gear ratio, not 3.92) are h226 getrags. Same in a 6spd rt, 6spd srt8s and the special mopar editions.


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post #6 of 29 (permalink) Old 04-09-2019, 07:10 PM
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Yup just as Newoldchallenger stated, the 3.92 is the same throughout trims levels....scroll to the bottom of the link below.

https://www.stevewhiteparts.com/oem-...mbly-5038237ah


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post #7 of 29 (permalink) Old 04-09-2019, 07:42 PM Thread Starter
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Cool, thanks for the info!
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post #8 of 29 (permalink) Old 04-10-2019, 09:44 PM
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Quote:
Originally Posted by Lopezel View Post
I have a 2014 manual Challenger RT and my differential just went out, I have a 3.92 ratio. I’ve been looking for a replacement and notice that there are SRT8s with a 3.92 gear ratio as well, I’ve notice they are automatics, I was wondering if it would work? And if it’s better that the RT? Should I get one from an SRT8 or one from an RT?
believe my diff just went out too on my 2012 m6 rt with a whipple, what were your symptoms/ how do you know its blown. mine has severe whine and clunking under any load. the whine drowns out my radio and whipple.


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post #9 of 29 (permalink) Old 04-11-2019, 12:49 AM Thread Starter
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Quote:
Originally Posted by Lopezel View Post
I have a 2014 manual Challenger RT and my differential just went out, I have a 3.92 ratio. I’ve been looking for a replacement and notice that there are SRT8s with a 3.92 gear ratio as well, I’ve notice they are automatics, I was wondering if it would work? And if it’s better that the RT? Should I get one from an SRT8 or one from an RT?
believe my diff just went out too on my 2012 m6 rt with a whipple, what were your symptoms/ how do you know its blown. mine has severe whine and clunking under any load. the whine drowns out my radio and whipple.
After a small burn out, I heard a click and the car wouldn’t move forward or backwards at all in any gear. I do hear a winding noise, which is my driveshaft and I can see it spin when I put it in gear and accelerate, but the tires won’t move so I’m assuming my differential is bad, I drained the oil today but didn’t see any metal shavings. But I am going to take a closer look tomorrow to confirm tho.
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post #10 of 29 (permalink) Old 04-11-2019, 10:44 AM
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Quote:
Originally Posted by Lopezel View Post
After a small burn out, I heard a click and the car wouldn’t move forward or backwards at all in any gear. I do hear a winding noise, which is my driveshaft and I can see it spin when I put it in gear and accelerate, but the tires won’t move so I’m assuming my differential is bad, I drained the oil today but didn’t see any metal shavings. But I am going to take a closer look tomorrow to confirm tho.
If you are not seeing metal in the diff oil, and the prop-shaft and half-shafts aren't flopping around but visibly spinning...then it could be a bad CV joint or a spline is wiped out.
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