8HP75 Transmission Fluid Change

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02Steve15

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I'm just curious when you think would be a good time to change the ATF. My owner's manual only covers the six speed for maintenance intervals. I'm currently at 62,000 miles, mostly highway driving.

I've been seeing a lot of different recommendations online.
 

Fritter

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Given the minimal differences between the 8HP70 and 8HP75 - the 8HP70 recommendations are probably relevant. Now would be a good time to drain and fill the fluid. Not all is replaced. The 8HP70 process is provided below (thx to Wild One's new transmission) - see the attachment.
 

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HEMIMANN

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There's also information from the transmission manufacturer stating to change oil @ 60,000 miles, I believe.

Not Mopar claiming it never has to be changed just to market "low maintenance".
 

Fritter

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OP: The title of the tread is "8HP75... " but you indicate a 2015 5.7L in your profile. Did you get an upgrade - either new tranny or new vehicle?
 
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02Steve15

02Steve15

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Ok thanks, sounds look it needs to get taken care of, it's been about 8 years anyway. I looked it up real quick from ZF and saw 50-75k and another that says 70-80k so numbers are really all over the place.

I just googled ZF HP870 maintenance interval (I thought it was the 75 but it is the 70)
 
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02Steve15

02Steve15

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Might end up hitting the differentials as well. Manual doesn't really specify when to change the fluid on those but it does say the transfer case is 12 years/120k.
 
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Fritter

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Here's an excerpt from the April 2016 ZF 8HP Service Information bulletin (50130 EN):
"Depending on the driving style, ZF recommends a transmission oil change every 80,000 to 120,000 km or after eight years at the latest." Equates to ~50k miles to 75k miles. This statement is removed in the March 2022 version.

This differs from the Mopar recommendations and other experiences so determine a maintenance strategy that you're comfortable with.
 

DILLIGAF

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OP get yourself a PPE pan and some Valvoline Max Life :anitoof:
 

Wild one

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I'm just curious when you think would be a good time to change the ATF. My owner's manual only covers the six speed for maintenance intervals. I'm currently at 62,000 miles, mostly highway driving.

I've been seeing a lot of different recommendations online.
You're right in the ballpark to do a pan/filter and new fluid in your truck. If you're doing it yourself,you need the rear tires about 8 or 9" in the air to get the transmissions pan rail level,and a wet rag draped over the exhaust helps mininiumize the ouch factor. The instructions say 122F,but i've since found out from ZF the colder you can do the check the better,and according to them 105 to 110F is about the ideal temp to do the level check at,that means starting with as cold a transmission as you can,cause if you start with it at 86F it'll be at the 122 temp before you can get through the procedure.I use a modified garden sprayer to put the fluid back in the the fill plug hole,as it's a bit of a pita to get at.Also break the fill plug loose before you start,as they use a gorilla to install it,and it can cause some blood leakage busting it loose.


 

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I feel a little stuck in the middle with this subject. I purchased the lifetime warranty for my '18 1500 just before they stopped selling it. I'm currently sitting at a little over 100k miles and haven't had any trans issues (hopefully putting it here doesn't jinx it!). I'm afraid that since the truck manual says "lifetime" if I service the tranny they'll be able to hold it against me if something does go wrong in the future. I'd like to have the tranny serviced but I figure I'll let it ride. When/if something happens it should be on them to address it since I adhered to their "lifetime" recommendation and didn't mess with it.
 

farout75

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I'm just curious when you think would be a good time to change the ATF. My owner's manual only covers the six speed for maintenance intervals. I'm currently at 62,000 miles, mostly highway driving.

I've been seeing a lot of different recommendations online.
y Owners Manual said 120,000 miles. I replaced to filter/pan and oil. I have the Max care warranty and I follow it by the book.
 

Wild one

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I feel a little stuck in the middle with this subject. I purchased the lifetime warranty for my '18 1500 just before they stopped selling it. I'm currently sitting at a little over 100k miles and haven't had any trans issues (hopefully putting it here doesn't jinx it!). I'm afraid that since the truck manual says "lifetime" if I service the tranny they'll be able to hold it against me if something does go wrong in the future. I'd like to have the tranny serviced but I figure I'll let it ride. When/if something happens it should be on them to address it since I adhered to their "lifetime" recommendation and didn't mess with it.
As long as you used the factory mopar 8/9 speed fluid and factory pan/filter,i don't think they'd be any wiser,plus after you have a 1,000+ miles on it,and the pans a bit dirty,i doubt they could tell it'd been changed/serviced. Techinically it shouldn't affect your warrenty if you use all factory parts and fluid
 

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I always do the check in the morning, and with it being cooler right now, it's the perfect temperature to check before driving for the day. I jack the rear up to get the pan level, then start the truck, let it idle down, then open the fill plug to top off the fluid until you get fluid coming out. The put the plug back in and do the procedure while the transmission is still cold. Usually it's sitting between 65-75 F when doing the shifting. Then let the fluid drain until it starts trickling which is usually in the mid 80s to low 90s.

Wild one, are you saying ZF states that the fluid should be trickling out in the 105-110 F range?
 

Wild one

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I always do the check in the morning, and with it being cooler right now, it's the perfect temperature to check before driving for the day. I jack the rear up to get the pan level, then start the truck, let it idle down, then open the fill plug to top off the fluid until you get fluid coming out. The put the plug back in and do the procedure while the transmission is still cold. Usually it's sitting between 65-75 F when doing the shifting. Then let the fluid drain until it starts trickling which is usually in the mid 80s to low 90s.

Wild one, are you saying ZF states that the fluid should be trickling out in the 105-110 F range?
Any temp between 86 and 122,but the ideal temp is closer to 105/110,that's on your evic transmission temp,not engine temp.
 

popcenator

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Any temp between 86 and 122,but the ideal temp is closer to 105/110,that's on your evic transmission temp,not engine temp.
Correct, transmission temp. I've been told that they prefer the check closer to the 40 C (104 F) range which would match up to what you were told.

With the transmission at a slope already, and coupling that with a level which would increase the angle, I would think you would want more fluid in there to compensate for the angle. The increased slope of a level would effectively mess with the level even more wouldn't it?
 

iWolfRam

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I just did my 8hp70 fluid and filter (went with Dorman) change at 83K. Super glad I did. I wasn’t having any issues, but I can definitely tell it’s shifting better now post-change. Used the Valvoline Synthetic ATF.

I’d say to the OP- if you don’t wanna worry about going through a potential future down period, if your tranny goes, then a $150ish fluid and pan change is worth it. (This $$ would be more with all OEM stuff). Im the kind of guy who’d rather do preventative maintenance now, because with my luck, things will go wrong at the absolute most inopportune time.
 

Wild one

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Correct, transmission temp. I've been told that they prefer the check closer to the 40 C (104 F) range which would match up to what you were told.

With the transmission at a slope already, and coupling that with a level which would increase the angle, I would think you would want more fluid in there to compensate for the angle. The increased slope of a level would effectively mess with the level even more wouldn't it?
I'm not quite sure what you're question is??
 
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