ZF/Chrysler Eight Speed RWD: Part 1
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- เผยแพร่เมื่อ 19 พ.ค. 2024
- ZF/Chrysler Eight Speed RWD Automatic Transmissions
(Completely new modular design unit to accommodate a variety of applications)
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The ZF8HP family of transmissions has only five clutch packs like 6HP, however, they contain four planet sets, all simple gear type. The layout of the unit is compact. There are several different models of the 8HP, depending capacity. They initially ranged from the 8HP30 to the 8HP90 for GEN 1. There are now more models for GEN 2 & 3. Beginning in 2012, Chrysler added the line. Initially, Chrysler purchased the 8HP45 from ZF but in 2013 started to manufacture their own version of the design called the 845RE.
The 8HP is a one-piece case modular design. The transmission uses ASIS (adaptive shift strategy) to enable the TCM to adjust operation throughout the life cycle. An adaptive learn procedure can be performed if issues exist. The procedure will monitor clutch fill time, fill count & fill pressure. Fail safe will default to 6th gear.
To limit drag, three of the five shift components are always applied. Torque converter lock up strategy has also been improved to enhance performance and fuel economy. Certain models have start-stop.
The transmission is drive by wire with a solenoid operated park mechanism. If power is lost, park will have to be released manually.
The valve body is Internally controlled (mechatronic) w/TCM. It contains nine solenoids (two for park).
The pump is a Chain driven remote access vane type with splined converter drive gear & aluminum cover / housing. - ยานยนต์และพาหนะ
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Looking forward to part 2!
Thanks, that was cool, waiting for part 2! 😊
I wish there were more guys like Anthony working in the automotive filed, I may then entrust them to work on my vehicles!
Thank you for sharing information
Good info, thanks! 👍
your knowledge is very impressive. Thank you sir.
Thanks! … and you're welcome.
Thank you so much
Thanks for the info Dean-o
I love that he treats anthony like Sh**
Glad I have the zed f in my Land Rover discovery D4 ( UK )
Amazing...
I have a 2018 Jeep Grand Cherokee Limited 2WD... trying to find out which of the two ZF transmission I have, the 8HP70 or 8HP75 and how can I tell/verify...thanks guys.
Lol don't want to get my shirt dirty. Reminds me of my old instructor
Bless! I will like to see a video or instructions on replacing the torque converter on that 8 speed trans.I what to know how far in does the torque converter goes in the bell housing....thanks!
Great video. Amazing how easy it comes apart. Almost Like a 6l80. My 8hp70 is giving me that 2-3 and 4-5 flare I've seen other people experience before. Only under very light loads sometimes but shifts beautifully with anything more the 5% throttle and shifts like an animal while hammering it. Figured it was chryslers tuning but I did a diablosport tuner and it's still there. Might throw a valve body at it.
I have a new 5th gen ram with the 8hp75 and it also has the flare shift issue under light 5-10% throttle. I seen something about when u replace a battery it does something to where the dealer has to refresh the ecm/tcm dumbest thing I've ever heard if that's even true but I will say when I replaced the battery that's when it started. Other then that my truck has been flawless with 81k miles so far.
@@bmf88 I just had hemifever do a tune for me. Flare is completely gone. I did the zipkit and it didn't like that. I ordered a reman valvebody and truck wouldn't even come out of park. I put my valvebody back on and shifts are beautiful until trans warms up. Yesterday it stuck itself in 2nd then 1st until I unplugged the battery. I'm going to pick up a low mileage unit today. I'm done screwing around with this one. I was trying to find out if a 75 would swap over but don't feel like throwing $1000 on a gamble right now.
@@Matp345 tuning was gonna be my next move just blows me away how expensive it is just to tune these new trucks. This is my first hemi and I love everything about the truck I just came from the early mid LS stuff and if was super cheap to tune one. Lol
@@bmf88 me too. I'm a chevy guy and this is my first hemi. The tune made it feel like a real trans. Stock was too soft. The diablo trans tune helped but hemifever woke it up
@@Matp345 nice I gave up on gm our last 2 escalades were the biggest overpriced piece of 💩 they want u to pay top money for their stuff and won't honor the warranty when something happens the clear coat on the 22s completely peeled off they would never replace them and that's just one thing of many
Does this ZF8HP have a torque converter and how would you do an oil flush when dropping the pan and changing oil? Love the vid guys!
Yes it has a convertor. A quite complex one at that. There's tons of writeups about how to service out there. It's fairly simple. If u have a dodge truck like me wear good gloves cause the exhaust blocks the fill bolt
That would be interesting. Hopefully we can see a video of that.
Do those values looks ok?
Clutch till pressures:
Clutch A: 16 mbar
Clutch B: -108 mbar
Clutch C: -22 mbar
Clutch D: -86 mbar
Clutch E: 106 mbar
Clutch till times:
Clutch A: 22 ms
Clutch B: 22 ms
Clutch C: 16 ms
Clutch D: 65 ms
Clutch E: 58 ms
Late to the party. Are the cases the same, 8HP45, 8HP70, 8HP90?? Valve bodies same?
Now if ZF only thought to let us have a dipstick and fluid change... but because we're a lease society, seal it up because who would drive one 123K miles and need to change the oil?
So someone I know has this transmission in a Chrysler and the trans fluid has never been changed and it has 180,000 miles on it and it still works fine do you think it would still be okay to change it or keep old trans fluid
@@pencilshavings5051
At that point leave it alone.
I would do a filter change and drain&fill.
That's just me tho.
I know this transmission is bulletproof how often should the fluid be changed at what mileage . Just curious because I have a 2018 Chrysler 30 which now has 50k on it
you dont need to change it. it lasts a life time
@@mattboski2339 what’s the mileage on your car
@@mattboski2339 thanks for the info I just saw the video 👍
ZF recommends 50-60k miles for the 8HP
even though BMW and Others say you don't have to service. I choose to agree with ZF because they engineered it and know what they are talking about and a salesman on a dealership floor is just saying what he is told to say. I just completed a 8HP pan/filter and fluid change and on the 2016 535i, the filter was black, magnets were covered in normal wear material levels and the fluid was dark and glittery. I would like to note that the driving style this trans has been exposed to has been extremely gentle by an elderly driver. all normal wear at 60k but I don't think id want to that multiplied at 150k miles. IMHO
Iam going to change mine next week the car just hit 66k
Is it still okay to change trans fluid even after 180,000 miles
no
Don't believe the th350 guys from the 70s. These transmissions operate very different from the old stuff that "you shouldn't change the fluid" I always do trans services no matter the milage and have never had one fail. Change it as often as you can. You can't over-maintenance one.
@@mattboski2339 you are giving wrong info man. these things should have a fluid change every 50k-60k. That is what zf says on their website. Chrysler saying it is lifetime fluid is straight up misinformation. All the guys that actually work on these things know that lifetime fluid is not a real thing. You need to be replacing the fluid, or else you will be replacing the transmission
Their “lifetime” really only means “for the lifetime of the warranty.” But yea I’m doing as much research as I can before changing out my transmission fluid and filter. So just to verify, u can use the pan of a 8hp70 on a 845re transmission right? @MrCattbone
@@jphantom6296 I’m pretty sure that they are the same bolt pattern, but the 845 has shallower pan. What car is it in?
Please Remember me at 300 subscribers. What app is that? let's build each other up Xd
Boring