[chizzle1]

Just drained the fluid in the rear differential on my 10 Challenger R/T... It was disgusting. Not a hint of golden, pitch black and full of clutch material. I do drive hard, but I didn't expect the fluid to come out looking like it did. I'll be installing RP Max Gear 75-90 in the morning. just a word of caution for those of you with the limited slip differential following the factory recommended change intervals. pictures to follow.

 

[KeysB5Blue]

Changed mine in the SRT when I changed the tranny fluid at 25K...as long as it was on the lift-why not.....

 

[jkelly16]

I don't have the limited slip on mine but I bought the RP 75W140 last week for when I have the service done in a few weeks. I'll be close to the 50k mark.

 

[challengerfan56]

Good information! I changed my R/T's power train to all synthetics at about 16,000 miles and the rear diff fluid looked similar to what you described. Yes I do regular maintenance and sometime drive it like I stole it, LOL!

 

[chizzle1]

damn, how do I delete attachments? I can't upload any more.

Got the rear diff topped off this morning before work. Took almost 2 quarts.
Will be replacing the factory fluid in the 6 speed with RP Synchromax this weekend.

 

[MIDNITE RT]

damn, how do I delete attachments? I can't upload any more.

Got the rear diff topped off this morning before work. Took almost 2 quarts.
Will be replacing the factory fluid in the 6 speed with RP Synchromax this weekend.

You can't delete previously uploaded attachments.You can increase your capacity by becoming a site supporter or use a site like photobucket to upload pics to the Z.

 

[chizzle1]

thanks. let me see if Google+ works...
https://plus.google.com/u/0/photos?pids=6044037137677130642,6043836891589704450,6043837421709038802,6043798145404063122,6043755350799595730,6043476884614910866,6043460957219522098,6043447040359670162,6043145794513857330,6043058856821424786,6042750443025793698,6042303163015818162&oid=113557869135450961893#photos?pids=6044037137677130642%2C6043836891589704450%2C6043837421709038802%2C6043798145404063122%2C6043755350799595730%2C6043476884614910866%2C6043460957219522098%2C6043447040359670162%2C6043145794513857330%2C6043058856821424786%2C6042750443025793698%2C6042303163015818162&oid=113557869135450961893&pid=6044037137677130642

 

[TikiMan]

That requires a login.

 

[friendoffur]

Just drained the fluid in the rear differential on my 10 Challenger R/T... It was disgusting. Not a hint of golden, pitch black and full of clutch material. I do drive hard, but I didn't expect the fluid to come out looking like it did. I'll be installing RP Max Gear 75-90 in the morning. just a word of caution for those of you with the limited slip differential following the factory recommended change intervals. pictures to follow.

This has been a real thorn in my side that had me calling everyone I could some years back at Chrysler. Chris...just show me....ANYWHERE....where Chrysler says what the intervals are for rear-end fluid changes!!!!! They say when to LOOK at it....by the same high school kid the dealership has doing their oil changes...and let him decide if it LOOKS to him that it might need changing....but no mileage "change it" recommended ANYWHERE!!!!:shakehead: Anyway...GOOD imfo on this post buddy!!:smileup:

 

[MommaBetty]

This has been a real thorn in my side that had me calling everyone I could some years back at Chrysler. Chris...just show me....ANYWHERE....where Chrysler says what the intervals are for rear-end fluid changes!!!!! They say when to LOOK at it....by the same high school kid the dealership has doing their oil changes...and let him decide if it LOOKS to him that it might need changing....but no mileage "change it" recommended ANYWHERE!!!!:shakehead: Anyway...GOOD imfo on this post buddy!!:smileup:

Dan, this has caught my attention too. I didn't see anything in my owner's manual about when to change these out. Can you give my the time line again? I am planning on keeping my car at this point, so I sure would like to keep her running smooth.

 

[friendoffur]

Dan, this has caught my attention too. I didn't see anything in my owner's manual about when to change these out. Can you give my the time line again? I am planning on keeping my car at this point, so I sure would like to keep her running smooth.

There IS a recommended transmission fluid change out that most have agreed that is the best time to do the rear-end fluid change-out at that time if you have the non limited slip rear-end. |If however you have the 6-speed...or you have the automatic transmission with the optional limited slip rear-end (rare)...I wouldn't go more that 25K if it was my call.

 

[MommaBetty]

I have a file with all my service work in it. I put a sticky note on my last service record, so I won't forget to get this done. Thanks again, Dan!

 

[chizzle1]

On a similar note: I just replaced the stock ATF+4 that comes in the 6 speed with Royal Purple Synchromax. It does make a noticeable difference. IMHO some of the 'notchyness' between 1-2,2-3 is dimished, seems a little quieter in neutral with the clutch out, and it should run cooler.
Make sure you have a fluid transfer pump ($5 on amazon), and a good set of ramps. I could barely fit under due to the low profile ramps I have.

 

[Mysty1]

Thanks for the info. I will change mine soon

 

[JimMc]

Just drained the fluid in the rear differential on my 10 Challenger R/T... It was disgusting. Not a hint of golden, pitch black and full of clutch material. I do drive hard, but I didn't expect the fluid to come out looking like it did. I'll be installing RP Max Gear 75-90 in the morning. just a word of caution for those of you with the limited slip differential following the factory recommended change intervals. pictures to follow.

Thanks for the tip...I'm coming up on 25K soon. :smileup:

 

[Mysty1]

The owner's manual only states to inspect the rear axle fluid, they do not say anything about changing it. They say to change the manual transmission fluid at 96,000 miles or 160,000 km. I have 51,000 km on my car and and I checked both and the fluids are still looking great. I will monitor every engine oil change and when it gets dirty I will change it.

 

[chizzle1]

It's cheap insurance to upgrade the fluids in my opinion. A lot of 6 speed owners, myself included now, have experienced positive results when switching to synchromax in the trans.
I often wonder if my original diff would have failed (due to overheating) if I had swapped to RP initially.

 

[BlackedOut13]

looks like this is going at the top of my maintenance list! now just to tell the wife i need to spend about another 150 bucks to change these fluids out... Did y'all notice much better shifting and response after upgrading?

 

[chizzle1]

You can DIY it for a lot less than $150, the pump you'll need is less than $20 at most auto parts places.
It's not going to feel like a new transmission, but it will improve lubrication and heat dissipation.
Make sure you change the diff fluid also.