I have found looking for a "BMW transmission from X car" has netted me better prices than explicitly looking for 8hp70 on marketplace. Example: 2010-2017 BMW 550XI GT F07 8 SPEED
ZF 8HP70 conversion IFS 100 series - anyone with experience?
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I had seen this earlier today!
If cost was no object I'd be throwing everything I have at this but I'm still trying to catch up on baseline stuff although I'm pretty good overall.
Was reading through another thread on the 80's side and found someone doing a 1fz swap and they ended up using the stock trans cooler for a P/S cooler and then adding a new ebay cooler for the 8HP
It's still $1000 if you include the shipping cost.
Still very true. Have been considering running to a pick and pull equivalent in SoCal and pulling it myself for a much reduced cost
FWIW I had the 6HP in my F02 740i s*** the tin at 130k km although I suspect the previous shop allowed coolant into the box and didnt tell the owner so mine ended with a $7500 rebuild (one quote was $12K) fortunately my transmission guy has been around for 47 years and knew a guy who could repair the mechatronic (electronic repair) but I have had multiple Beemers and always serviced them even if I was told they had been done. I never had a single issue even at 250k km. The tech said do fluid changes every 40k km (he is a ZF specialist also) I reckon it would be a sweet conversion having a few extra cogs at your disposal.
The 6HP and its copies by Ford, GM and Chrysler are the worst transmission ever produced.
There is a design flaw which was never addressed (recall) and everyone faces some problems sooner or later.
Seems like people have swapped these to the 1HD, 1HZ, 1FZ, but still no 2UZ
A few questions I have, revealing my lack of knowledge:
A few questions I have, revealing my lack of knowledge:
- Can you just use the OEM transmission cooler on the 8HP?
- Can you use a stock ECU with the right aftermarket TCU, or do you need to modify the ECU as well in some way to get an RPM signal to the transmission?
- Other than cost, is there any reason not to go with something like an 8HP75? Seems like there are some build quality and efficiency improvements in the 2nd gen ZF8
From the people that have swapped them I'm unsure if anyone has reused the factory trans coolers. Saw one of the dudes in the 80 forum saying they used an ebay trans cooler and then used the factory cooler as a power steering cooler. Not sure at all with the stock ECU rpm signal but I don't have the schematics in front of me to see. I'm sure there's a way to do it.
The domiworks adapter says you could use a multitude of different 8HPs, just depends on what you find/have available to you.
The domiworks adapter says you could use a multitude of different 8HPs, just depends on what you find/have available to you.
Toyota 1UZ/2UZ/3UZ 8HP 70/75 N63 Adapter Kit
Adapter kit to fit a BMW 8HP 70/75 gearbox from N63 to a Toyota xUZ engineToyota 1UZ/2UZ/3UZ 8HP 45/50/70/75/76 N57 B58 B57 S58 Adapter Kit
Adapter kit to fit a BMW 8HP 45/50/51/70/75/76 gearbox from N57 B58 B57 S58 to a Toyota xUZ engineToyota 1UZ/2UZ/3UZ to Dodge 8HP 70/75/90/95 Charger/Challenger/Scat Pack Hellcat Trackhawk RAM Adapter Kit
adapter kit is compatible with 8HP70 / 75 / 90 / 95 Transmissions from:- Charger
- Challenger
- Scat Pack
- Ram 1500 (not Ram Ecodiesel)
- Trackhawk
- Hellcat
1 technically I guess, would it be good enough IDK
2 you would need to tap that signal from somewhere
I THINK you could get the RPM signal from the crank position sensor, it's a pulsed DC signal from what the google machine tells me and goes into the ECM inside the cab to power the tach
The turbolamik NEEDS RPM signal, MAP sensor input, and throttle position. To have everything else work like normal you need input for brake/reverse lights, and a clean ground. Could also add shift inputs
Struggling to find a local 8HP70/75 so I'm not paying over 2k for a decent unit off ebay. I do see a 8HP50 that's somewhat close by. Trying to get a BMW unit as I have heard the output shaft on the dodge units is weaker from domiworks
8HP70 gear ratios were already posted in the beginning of the thread so I'll leave these other ones here>
8HP50 (R) −3.456 5.000 3.200 2.143 1.720 1.314 1.000 0.822 0.640
8HP75 (R) −3.317 4.714 3.143 2.106 1.667 1.285 1.000 0.839 0.667
The only issue I see possibly arising from using an 8HP50 is the lower advertised torque rating of 500nm (368FT-LBS) which doesnt give me a lot of headroom if I decide to supercharge in the future. That being said the torque ratings are severely underrated from all the bimmer folks doing go fast stuff.
Suppose my main worry is if I am trying to do this with a (minimum) 5600lb car that will only get heavier vice the 8HP50 coming out if an F chassis that was around 3,820lbs
Do I send it?
8HP70 gear ratios were already posted in the beginning of the thread so I'll leave these other ones here>
8HP50 (R) −3.456 5.000 3.200 2.143 1.720 1.314 1.000 0.822 0.640
8HP75 (R) −3.317 4.714 3.143 2.106 1.667 1.285 1.000 0.839 0.667
The only issue I see possibly arising from using an 8HP50 is the lower advertised torque rating of 500nm (368FT-LBS) which doesnt give me a lot of headroom if I decide to supercharge in the future. That being said the torque ratings are severely underrated from all the bimmer folks doing go fast stuff.
Suppose my main worry is if I am trying to do this with a (minimum) 5600lb car that will only get heavier vice the 8HP50 coming out if an F chassis that was around 3,820lbs
Do I send it?
70/75 all the way
First post on this thread for 2026!
So as I have a 2000 I have learned that the 98-02 ECUs aren't flash-able like the 03-07 so I'm trying to figure out what to do to try and make all this jive. I don't know about what all is different between USA and ROW vehicles as far as stuff like OBDII stuff and the like, I had seen 8speedau had to swap in a manual 100 series ECU to have everything play nice, which btw is P/N 89661-6A270. But that is something I may have to source from OCONUS.
I know wink4x4 uses a turbolamik for their kit but looking back through this thread someone used a MaxxECU for another 8hp swap. I was hearing that MaxxECU didn't support AWD/4WD but now that I've thought about it more retaining the stock HF2A transfer case renders that moot I believe and you could possibly run the single standalone ECU to control both engine and trans (to make up for the factory ECU possibly being unhappy with the A343F missing) and the factory transfer case is manual so it wouldn't have any impact on the transmission, would possibly need to setup different modes to limit shifts for 4low.
I've never done a standalone ECU so that's a little scary for me to think about and that would also impact emissions testing I believe. Other option for keeping the stock ECU with a turbolamik could be setting up resistors matching the solinoids in the factory trans to keep the ECU happy. I have seen emulators but they call out it being a neccessity for VVTI UZ engines so I'm uncertain of what would happen with a earlier 2UZ.
As it stands right now for doing a swap and having everything physically fit together you should be looking at:
UZ to 8HP adapter plate, 8HP trans, HF2A/V adapter plate, an 80 series input shaft (most commonly installed for transfer case under/overdrive kits) and potentially shorten/lengthen driveshafts and then fabbing a trans cross member as needed.
So as I have a 2000 I have learned that the 98-02 ECUs aren't flash-able like the 03-07 so I'm trying to figure out what to do to try and make all this jive. I don't know about what all is different between USA and ROW vehicles as far as stuff like OBDII stuff and the like, I had seen 8speedau had to swap in a manual 100 series ECU to have everything play nice, which btw is P/N 89661-6A270. But that is something I may have to source from OCONUS.
I know wink4x4 uses a turbolamik for their kit but looking back through this thread someone used a MaxxECU for another 8hp swap. I was hearing that MaxxECU didn't support AWD/4WD but now that I've thought about it more retaining the stock HF2A transfer case renders that moot I believe and you could possibly run the single standalone ECU to control both engine and trans (to make up for the factory ECU possibly being unhappy with the A343F missing) and the factory transfer case is manual so it wouldn't have any impact on the transmission, would possibly need to setup different modes to limit shifts for 4low.
I've never done a standalone ECU so that's a little scary for me to think about and that would also impact emissions testing I believe. Other option for keeping the stock ECU with a turbolamik could be setting up resistors matching the solinoids in the factory trans to keep the ECU happy. I have seen emulators but they call out it being a neccessity for VVTI UZ engines so I'm uncertain of what would happen with a earlier 2UZ.
As it stands right now for doing a swap and having everything physically fit together you should be looking at:
UZ to 8HP adapter plate, 8HP trans, HF2A/V adapter plate, an 80 series input shaft (most commonly installed for transfer case under/overdrive kits) and potentially shorten/lengthen driveshafts and then fabbing a trans cross member as needed.
I saw someone on mud was using an early 2000 Sequoia ecu for their supercharger build as it was "tuneable" but that required repinning the stock harness and IDK if that would help out transmission problems.
Maxxecu doesn't support any AWD 8HP transmissions but the 8HP swap group on Facebook saids to just replace the AWD TCU with one from a 8HP supported Maxxecu.
Probably wouldn't recommend a TRUE standalone setup would probably just piggy back a maxxecu which is also recommended by the FB group (a bunch of people post about having Holly's or LinkECUs or W/E and they're always told to sell it and run a Maxx). But piggy backing you always have the possibility of voltage drop and the stock ECU being unhappy with that.
The turbolamik and resistor/emulators sounds interesting could be a easy way to get rolling. Idk how the turbolamik would control throttle on the pre 03 Landcruisers with the cable driven throttle and i don't think the 8hp would be very happy with no torque management either.
Maxxecu doesn't support any AWD 8HP transmissions but the 8HP swap group on Facebook saids to just replace the AWD TCU with one from a 8HP supported Maxxecu.
Probably wouldn't recommend a TRUE standalone setup would probably just piggy back a maxxecu which is also recommended by the FB group (a bunch of people post about having Holly's or LinkECUs or W/E and they're always told to sell it and run a Maxx). But piggy backing you always have the possibility of voltage drop and the stock ECU being unhappy with that.
The turbolamik and resistor/emulators sounds interesting could be a easy way to get rolling. Idk how the turbolamik would control throttle on the pre 03 Landcruisers with the cable driven throttle and i don't think the 8hp would be very happy with no torque management either.
There is a throttle position sensor somewhere on my '00 since I see it with my scan gauge and other OBD readers. I know there's others with mechanical diesels running turbolamik with the TCU only really controlling shifting with non CAN signals so and it would ideally be my main choice. One of the guys in the 80 forum ended up running the truck on jack stands and had someone remote in to do initial tune on the trans/tcu and then went out and did the adaptations so it should be able to figure it out to an extent. I may try to see what happens if I hook up the AT emulator but it's TBD right now
Wink hasn't replied to me about anything since I hit them up last, Ideally I'd like to try and get the bezel for the shifter from them but I may end up just buying a 3d scanner and printing it myself.
Ben3D or LJE might be able to help with the shifter bezel
@Papa Wickey Valley Hybrids in stockton CA might have a spare input shaft gear that you can use with the shaft that comes with the Domiworks H2FA adapter.
I have since taken a gamble on a HF2A from a 91 80 that was mated to an A440F. I know the input axle on this won’t work to do a direct swap so I can take my current case out so I think I’m gonna finish cleaning this one up and figure out if the CDL will work.
Or ask pretty much any 80 series owner that has done the underdrive gear swap, lucky enough I already done it on my 100 a few years ago. Picture is showing the Domiworks shaft next to my factory 100 series shaft
