First Transmission Drain and Fill

[aceinfinity]

Everything in life has a risk.

To me, this is a low risk process that the engineers themselves specifically say should be done between 50K - 75K miles

And if it breaks after 60K miles, who is going to fix it? Not Jeep. It's out of warranty.
I'll take the risk and do what the engineers recommend.

The transmission is an 8HP50 aka 850RE

Here is the ZF Service Information directly from the designers

Sure thing! I would never do something if I was going to be concerned enough to weigh it and worry about it. Best of luck to you !

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[Maximus Gladius]

It’s a difficult position to be in if you want something to last well into the future. This is not the meaning of “lifetime”. The oil lasts as long as the transmission. Question is ‘what tanks first, the oil or the component?’ Being proactive in maintenance is a good habit to get into. Forgetting about it or turning a blind eye just results in its “lifetime” not being that long.

The other camp says, put on 60k or 100k and trade it in. The next guy can deal with it. I’m all for maintenance and I even go a step further and do oil analyses all during the life of the components, if it has oil to run, I want to keep an eye on its health to see how the component is doing.

 

[Stuntman Mike]

Here is what my friend recommended: (have not translated it but if required I can)

Moin Jörg,

Einfache Frage, viele Meinungen.

Offiziell hat das 8HP ohne Hybrid (das sollte im Gladiator drin sein) eine Lebensdauerfüllung.
Das bedeutet prinzipiell 10 Jahre, oder 160tkm.

Bekannt ist dass die Wandlerkupplung bei den 6- und 8HP-Getrieben, abhängig von den Betriebsbedingungen über Laufzeit, zum Shuddern neigen kann. Das fährt sich dann recht unangenehm.

Ein Öl- und Filterwechsel bei ca. 80tkm ist also absolut sinnvoll und tut dem Getriebe insgesamt gut.

Von Spülungen wird bei ZF abgeraten, da man nie so genau weiß was in den Spülmitteln drin ist.

Ich persönlich würde nicht spülen und alle 80tkm das Öl mit Filter wechseln.

Viele Grüße, Sven

 

[Maximus Gladius]

I can read it ?. I’m challenged that way

 

[713gladiator]

It’s a difficult position to be in if you want something to last well into the future. This is not the meaning of “lifetime”. The oil lasts as long as the transmission. Question is ‘what tanks first, the oil or the component?’ Being proactive in maintenance is a good habit to get into. Forgetting about it or turning a blind eye just results in its “lifetime” not being that long.

The other camp says, put on 60k or 100k and trade it in. The next guy can deal with it. I’m all for maintenance and I even go a step further and do oil analyses all during the life of the components, if it has oil to run, I want to keep an eye on its health to see how the component is doing.

I'm definitely in the preventative maintenance camp.

I've been following Brad Kowitz from Trailrecon on YT who has a somewhat close relationship with Jeep. Recently he had Jerry from Shift Autowerx, who has been a Certified Jeep Technician for over 10 years on his channel.

Brad and Jerry put up a nice YT video showing the transmission being serviced if anyone is interested.





Honestly, it makes sense that the fluid is going to break down at some point and it's a good idea to change it before damage happens to the transmission. Drain and fill is much more different than a flush, where a flush can disturb deposits and create problems.

 

[Lunentucker]

This is spot on. I can confirm the fluid levels are correct when doing this.

I saw...
Warm to 90 - 100.
Remove plug.
If fluid comes out, let it.
If fluid doesn't come out, top it off.
Replace plug.

 

[Hootbro]

When I did mine, I got 6.5 quarts out of it and approx. the same going back in.

 

[ecidiego]

if you really wanna go long term.... buy an under 1000 mile complete assembly from Rubitrux for $1100.

 

[Maximus Gladius]

I saw...
Warm to 90 - 100.
Remove plug.
If fluid comes out, let it.
If fluid doesn't come out, top it off.
Replace plug.

Ya, same thing as removing it when cold and see what comes out or not. Waiting till warm does accomplish the same thing.

I saw...
Warm to 90 - 100.
Remove plug.
If fluid comes out, let it.
If fluid doesn't come out, top it off.
Replace plug.

Where did you see this?

 

[Maximus Gladius]

I saw...
Warm to 90 - 100.
Remove plug.
If fluid comes out, let it.
If fluid doesn't come out, top it off.
Replace plug.

Oh I get what you said. Yes, I’d agree with this is where you’d want to plug it.

 

[CampThree]

I'm pretty anal about maintenance so I asked a close friend who owns a transmission shop. He's been wrenching on transmissions for the last 40 years and his Father had the shop for over 40 years before him. He said he never changed trans fluids in any vehicles and doesn't recommend it unless your having troubles. I'm the original owner of a 1993 Chevrolet C1500 pickup with 203,000 on the clock and only changed it once. I think I'll rethink the Mojave but it only has 8K on it now so I've got some time to wait.

 

[Lunentucker]

I'm pretty anal about maintenance so I asked a close friend who owns a transmission shop. He's been wrenching on transmissions for the last 40 years and his Father had the shop for over 40 years before him. He said he never changed trans fluids in any vehicles and doesn't recommend it unless your having troubles. I'm the original owner of a 1993 Chevrolet C1500 pickup with 203,000 on the clock and only changed it once. I think I'll rethink the Mojave but it only has 8K on it now so I've got some time to wait.

Had 189,000 on it when I sold it to a friend. Sealed system. Never changed. Ran great.

 

[Sempe-Fi Rubicon]

Here is what my friend recommended: (have not translated it but if required I can)

Moin Jörg,

Simple question, lots of opinions.

Officially the 8HP without hybrid (that should be in the Gladiator) has a lifetime filling.
That basically means 10 years, or 160tkm.

It is known that the converter clutch in the 6 and 8 HP transmissions can tend to shudder, depending on the operating conditions over the runtime. This is quite uncomfortable to drive.

An oil and filter change at around 80,000 km makes absolute sense and is good for the transmission overall.

Rinsing is not recommended at ZF because you never know exactly what is in the dishwashing liquid.

Personally, I wouldn't flush and change the oil with filter every 80,000 km.

Best regards, Sven

Translation:
Hello Jörg,

Simple question, many opinions.

Officially the 8HP without hybrid (that should be in the Gladiator) has a lifetime filling.
That basically means 10 years, or 160tkm.

It is known that the converter clutch in the 6 and 8 HP transmissions can tend to shudder, depending on the operating conditions over the runtime. This is quite uncomfortable to drive.

An oil and filter change at around 80,000 km makes absolute sense and is good for the transmission overall.

Rinsing is not recommended at ZF because you never know exactly what is in the dishwashing liquid.

Personally, I wouldn't flush and change the oil with filter every 80,000 km.

Best regards, Sven

 

[Maine Cajun]

Here is what my friend recommended: (have not translated it but if required I can)

Moin Jörg,

Einfache Frage, viele Meinungen.

Offiziell hat das 8HP ohne Hybrid (das sollte im Gladiator drin sein) eine Lebensdauerfüllung.
Das bedeutet prinzipiell 10 Jahre, oder 160tkm.

Bekannt ist dass die Wandlerkupplung bei den 6- und 8HP-Getrieben, abhängig von den Betriebsbedingungen über Laufzeit, zum Shuddern neigen kann. Das fährt sich dann recht unangenehm.

Ein Öl- und Filterwechsel bei ca. 80tkm ist also absolut sinnvoll und tut dem Getriebe insgesamt gut.

Von Spülungen wird bei ZF abgeraten, da man nie so genau weiß was in den Spülmitteln drin ist.

Ich persönlich würde nicht spülen und alle 80tkm das Öl mit Filter wechseln.

Viele Grüße, Sven

Here's my translation. Let me know if I mistranslated.


Morning, Joerg,

Simple question, many opinions.

Officially the 8HP without hybrid (this should be what's in the Gladiator) is filled for the life of the component. That means fundamentally 10 years or 100,000 miles.

It is known that the (clutch?) of the 6- and 8HP-transmission, dependent on operating conditions over the running time, has a tendency to shudder (vibrate?). This becomes quite unpleasant.

An oil and filter change at about 50,000 miles is absolutely reasonable and overall good for the transmission.

ZF does not recommend flushing because you never know what is in the flushing stuff.

I personally would not flush and every 50,000 miles change the oil and filter.

Many greetings, Sven.

 

[Stuntman Mike]

Both translations are correct.

This "shudder" seams to be a specific term in the transmission guys language and I would also interpret it with "vibrate".

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