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Old 03-14-2016, 04:45 PM   #11
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The price we pay for technology Later RJD

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Old 03-14-2016, 04:49 PM   #12
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32 dollars a quart. Good lord thats alota money


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Old 03-14-2016, 07:27 PM   #13
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Originally Posted by TheGreatWaz00 View Post
You may want to check the maintenance schedule for the trany. I think you need a filter and fluid replacement at either 100000 or 150000 and the cost is near $1000
Please correct me if I'm wrong, but I don't see any reference to that task in the owners manual scheduled maintenance chart. The only thing is says about transmission inspections or fluid changes refer to the six-speed transmission. No mention about changing, etc., for the eight-speed HP70 transmission.

Is there another chart out there?
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Old 03-14-2016, 07:59 PM   #14
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Yep, no mention of servicing the transmission in the owners manual. What I have found on the net are people saying the same thing and some planning on doing it at 100K miles. Found one guy saying you can use an AMSoil pure synthetic. Don't know about that.
Meanwhile I guess I'll drive mine and see what's happening when I reach 100K if I keep this truck that long.
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Old 03-14-2016, 08:13 PM   #15
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FYI, when a manufacturer say's "lifetime" fluid, they mean for the "lifetime" of the warranty. This is how they keep projected maintenance cost's low. No fluid, transmission, brake, power steering, coolant, gear oil, will last a "lifetime" If you plan on keeping ANY vehicle maintenance is the key, you can't overdue it, but you sure can ignore it.
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Old 03-14-2016, 08:52 PM   #16
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I'm sure by the time you're ready to think about doing the trany filter amsoil and wolfshead will have the fluid and probably better.

PS I change mine every 40k (two filters and about 8qts for my 545RFE)
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Old 03-15-2016, 08:16 AM   #17
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Originally Posted by Blackrock View Post
Been going all over this new truck of mine and found out something I haven't come across before.
The transmission has engine coolant routed through it to aid in getting it up to optimum operating temp sooner. And here all these years we have concentrated on keeping transmissions running cooler. Engine temp is running at 206 and trans at 177 on a run in to town today.
Did some online research and found out this whiz bang ZF 8 speed is a whole new breed. Has no oil dipstick and uses it's own special oil that is good for the lifetime of the truck.
There are even powered shutters in front of the oil cooler to aid in rapid warmup. They do fail in the open position or are supposed to.
Gonna be interesting to see how this all works out towing in the Arizona heat.
Trans fluid has been cooled by going thru the engine coolant radiator for a long time now (bulb-type liquid-to-liquid coolers), for the same reason. It gets the fluid up to temp sooner, then helps to keep it there. Passenger vehicles make due with that as the only trans cooling, while proper tow vehicles get an aux liquid-to-air cooler. Sounds like Dodge has tried doing the opposite, pumping the engine coolant thru the transmission. I wonder if it's still the bulb-type coolers, submerged in the trans fluid.

By the way, my 2006 Mounty (Explorer clone) has no dipstick, uses a special synthetic oil, and is considered sealed for life. It does have a very small fill-port at the trans itself, but unless considered severe duty, it should never be touched. That's not really a new thing...well maybe for Dodge.
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Old 03-15-2016, 08:21 AM   #18
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Originally Posted by lbrjet View Post
My Ford is different but has the same concept: getting the tranny warm ASAP. No fluid goes through the cooler until it is up to about 160. Then only 10% until 186. Then opens wide and allows all fluid to pass through the cooler. I monitor the temp like a hawk with my Scangauge. The highest temp ever was 204 last July pulling from Phoenix to Flagstaff. Has only been above 200 four times in 22,500 towing miles at 98% of GCWR. I should note that I changed out the fluid and filter at 40K and 80K miles.

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2011 Flagstaff 831FKBSS
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I really don't think 200F is a big deal for modern transmissions using full synthetic fluids. Anybody with a Ford 6speed auto that I've heard from say their system is happy at higher temps.

When not towing, my Scangage shows 170-175 in the summer. Towing, I'm regularly 200-205F. The first owners towed a single-horse trailer with this SUV, and we tow a 5200 lbs camper. Still running strong.

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