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Sxt plus transmission service?

12K views 19 replies 7 participants last post by  samlab  
#1 ·
Pretty much as the title says. I’m coming up on owning the car for a year, and just want to make sure I’m not going to be having any issues coming up. Should I be servicing my transmission at 100k, or just leave it alone? Should I be doing it more frequently? Any advice is appreciated
 
#2 ·
What transmission does the car have, the 5 speed automatic or the 8 speed?

(Hint: 2014 and below year models have the 5 speed auto; 2015+ year models have the 8 speed auto)
 
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#4 ·
8 speed!

Tagline says 2016 SXT Plus which should have an 8HP50.
Just check the owners manual. It will list the service interval for it. I'm not sure for the 8HP50.

The service manual I have only lists the 8HP45 which is the prior gen version.

If this does happen to be the unit you have, it says:
  • it uses a custom fluid that is "...NOT compatible with ATF+4 or any other current Chrysler transmission fluid"--it says the owners manual will list the correct fluid to use.
  • the filter is integrated to the pan--thus you have to replace the pan also

You can do this yourself, but there is a specific procedure it asks for when filling to get the correct fluid level involving running it in specific gears for a few seconds each while on a lift and requiring an OBD scan tool to check the temperature.
I have the scan tool, but I’ll probably just get this done somewhere so I don’t mess it up
 
#3 ·
Tagline says 2016 SXT Plus which should have an 8HP50.
Just check the owners manual. It will list the service interval for it. I'm not sure for the 8HP50.

The service manual I have only lists the 8HP45 which is the prior gen version.

If this does happen to be the unit you have, it says:
  • it uses a custom fluid that is "...NOT compatible with ATF+4 or any other current Chrysler transmission fluid"--it says the owners manual will list the correct fluid to use.
  • the filter is integrated to the pan--thus you have to replace the pan also

You can do this yourself, but there is a specific procedure it asks for when filling to get the correct fluid level involving running it in specific gears for a few seconds each while on a lift and requiring an OBD scan tool to check the temperature.
 
#5 ·
845RE (8HP45) in 2016, 8HP50 2020 on. I'd have an expert do the change if needed, it's involved


Dodge says lifetime fluid, but:

ZF 8-Speed Service Intervals & Maintenance
Several automakers claim that the fluid inside their 8HP45-equipped models will last for the life of the transmission. That statement completely contradicts what ZF themselves say about their transmission. Automakers make those claims to help themselves meet pollution and emissions requirements. Lifetime fluid means less has to be produced and disposed of, thereby saving energy and the environment.

ZF calls for replacement trans fluid every 50-75K miles (80-120KM), or eight years, whichever comes first. It’s best to use ZF’s LifeGuard Fluid 8 when servicing your 8HP45. The fluid was designed by ZF for its transmission, essentially guaranteeing that it’ll perform as intended. Aftermarket companies, such as LIQUI MOLY, have their own fluid made to the ZF’s specifications that can be in place. When replacing the fluid, you should change the filter as well, and since the filter is part of the plastic pan, they are replaced as one piece.


A Guy
 

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#6 · (Edited)
I serviced the trans in my 2017 durango GT (845RE trans) which had 90kmiles. Also swapped in a PPE pan which holds an extra quart of trans fluid and has a serviceable filter along with a drain plug (the newer pans seem to have the drain plug deleted). It is a rather involved process to check the fluid level which I did repeated checks over a week (did it in the summer which takes the trans a while to cool down) to confirm the level was spot on. It can be done by a DIY'er but requires running the car (must be level) off the ground. Also, one of these fluid transfer systems makes the fill way easier.


In fact, I have some cheaper versions I use for the diff and transfer case.


The guys on the DD forum seem to change the fluid around the 75k mark but some folks have had a hard time finding a shop or dealership that would willing do the service as they were told the trans was fill for life...or something like that. BTW I go by Duh-rango on the DD forum.

 
#7 ·
I tend to lean toward the idea of early (or in this case 50-75k mile) transmission fluid change intervals, but am curious as to how the transmission is actually holding up. Should be a decently sized sample group of 2015-2016 cars running around with big miles on them. If they are holding up (and since I don't hear owners on the forums complaining about them), I feel better about Dodge's lifetime claim.
 
#8 ·
Hey everybody, just coming back with an update. I actually ended up bottoming out the car and messed something up bad, there’s transmission fluid all over my driveway now. At first I thought it was washer fluid because my reservoir had broke, but turns out to be the transmission. Didn’t really check into it until last night, and I had been driving the car pretty damn hard, so now I’m not surprised if I killed the transmission all together. I’m just gonna get it up in the air, get under there and see what’s up. I’m praying it’s just the pan, and I’m just going to be doing it myself if it is after watching a couple videos. I won’t know until tomorrow when I get under it and check it out
 
#9 ·
Sux you messed it up, what did you run over/into?

I've bottomed out, high centered, and scraped the underside of my 2012 so many times it's a horror show under there, but I've never cracked the transmission pan. Did you hit a curb at full speed and head on or something?
 
#14 ·
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Got the best picture I could for now how the car was. As you can see the crossmember is still wet. This was 3-4 days after the original leak, and like I said before I just kinda brushed it off. Hopefully I’ll be able to figure this out. I’m under the impression if I’m leaking, it’s either gonna be the pan or the lines. Let’s hope I’m right!
 
#15 ·
Hey everybody, I’m under the car now checking it out. Major leaks at transmission pan gasket, also looks like it’s leaking from where the transmission meets the engine. I’ve also got some leaks that look kinda high up? Maybe that’s just from me driving like a mad man? Because it’s not soaked up top. I’m going to grab some pictures for you all. Any help is appreciated guys, as of right now I’m gonna swap the pan and start praying that fixes a major leak, I can always deal with small ones

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#17 ·
Nah man I can’t even see wtf hit. Pan ain’t cracked or nothing I can see, I’m not running it cuz I’m pretty sure it’s empty. I gotta go pick up torx bits today. People on the fb page are saying it’s the trans cooler that’s mounded under the intake manifold, but why would the underside be soaked all around the pan?


The best way for me to describe it was like it was a reverse speed bump. Idk if they was doing construction in the road or what but outta nowhere it was just a huge indent going across the whole street
 
#20 ·
I have your answer. Change your gear oils every 45k like clockwork. Using the Dodge suggest manual and for every car manufacturer out there is playing with their known predetermined numbers for typical failure! Why? Because the sensors and electronics get mucked up by the carbon in your Tranny/Gear oil and by the suggested mileage it drains out Jet Black filthy.

Every 45k and you will avoid being slammed by the manufacturers r and r costs wether new or used parts.