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Will a rear 3.90 diff from an 05-10 v6 Charger fit a 2008 Dodge Charger r/t

8K views 17 replies 8 participants last post by  08toredrt 
#1 ·
I found mopar overstock is selling these =DIFFERENTIAL. Rear Axle. [DMT]. . "3.90 Axle Ratio". Required: 0011 DIFFERENTIAL. Rear Axle.
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Required: 1


DIFFERENTIAL. Rear Axle. [DMT]. . "3.90 Axle Ratio". Required: 001

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It appears that it should fit my 08 r/t so I can swap out my 2.82 diff for the 3.90 one ? Does anyone know if this will work... I think these originally came in v6 cars , I am hoping this is a direct bolt in as I will just buy a wavetrac unit to install in it .. any help would be great!!
 
#3 ·
I’m just hesitant because the rear of the 3.90 diff & mine is very different.. the 3.90 has the vent on the rear cover & the bolt holes aren’t the same where it mounts to the cradle .. on mine the vent is on the top of the diff & the rear cover has an ear that sticks out on the left side 2-3 inches , I guess I could change the rear cover but then the diff won’t have a vent ?
 
#6 ·
I’m just hesitant because the rear of the 3.90 diff & mine is very different.. the 3.90 has the vent on the rear cover & the bolt holes aren’t the same where it mounts to the cradle .. on mine the vent is on the top of the diff & the rear cover has an ear that sticks out on the left side 2-3 inches , I guess I could change the rear cover but then the diff won’t have a vent ?
 
#7 ·
I'm just hesitant because the rear of the 3.90 diff & mine is very different.. the 3.90 has the vent on the rear cover & the bolt holes aren't the same where it mounts to the cradle .. on mine the vent is on the top of the diff & the rear cover has an ear that sticks out on the left side 2-3 inches , I guess I could change the rear cover but then the diff won't have a vent ?
What is the p/n of the 3.690 rear end? You sure it's from 06-10 Charger?
 
#11 ·
Well I called mopar parts & they just took me it won't fit the v6 rears are 198mm & the r/t rear diff is 210mm well that sucks , was trying to get 3.90 gears & not spend $2500 on the getrag upgrade axles , hubs etc ...
Sorry, misread - though you were swapping entire cradle. Yes you would;d need axles as well but lots of people have done it.
 
#12 ·
I have a dss carbon fiber driveshaft that fits the 3 finger yoke ,so I guess I’m just going to have to go the getrag 3.92 swap with axles & hubs .. I have a 3.06 rear diff from a 08 srt8 with 24,000 miles on it that I was going to do the swap to but I guess it’s headed to eBay unless someone here is interested in it ...
 
#14 ·
I have 2009 charger rt with a 2.62 rear end , I came across a 2008 srt8 with front and rear cradles .. when I in stalled the srt8 rear , the ratio freaked the CPU out .... big time went in to limp mode stayed in third gear all the time I went back to the junk yard got the TCM for this srt8 which by luck was a mopar performance tcm car shifts great now no issues my 0-60 is a constant 420 and my best was a 406 sec I was impressed I haven’t got car retuned yet but shift point are off I ave a guy that tunes my car with HP TUNES .. far as the bolt pattern being different on the rear .. I used half the srt8 drive shaft and half my rt drive shaft at the slip joint , at the carrier bearing.. the spline was the same even measured out the same , done some made burnouts no issues yet other than ripping the srt8 rubber coupler part .. the fix for that was getting a factory one ☝ I got one from Germany seems to be holding up .. hopefully this helps changing Gears and doing headers has been the biggest improvement’s to this car so far


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#18 ·
Well I visited my friend in the parts Dept @ my local dodge dealer & I pulled the trigger on the 3.92 getrag, new axles & hubs to install on my 2008 charger r/t ... best of all is she gave me it all @ her employee discount so for $2030.00 I got all the parts to install..YAY, now I can finally install my dss carbon fiber one piece driveshaft! :banana:
 
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