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Hello guys! An extremely long time lurker but never posted before. Long story short, I have myself a 2010 FG falcon that originally had the 5 speed auto. The 5 speed milkshaked so I saved all my pennies and bought a zf6 to put in it and used Hootons harnesses to avoid changing the entire body loom. She's all in and changed from P,R,N,D. After using FORscan and figuring out the PATs programming I got it started and she drives and changes through all the gears, Hooray!. My main issue now is, especially in the higher gears, on low throttle, the RPM's surge a lot. You can't feel it surging but you can definitely hear it and see the RPM's bobbing up and down. I've driven just over 1000kms (long drives all in a week) and the problem seems to just be getting worse. This issue usually only occurs when the RPMs are below 2000. I don't believe it's fuel, ignition or vacuum problem as it idles completely fine with no misfiring and on my long drives I achieved an avg fuel consumption of 7.7L/100km. When I put the foot flat it has plenty of torque and changes the gears no worries. It's as if the transmission is hunting, or surging. This is my first automatic vehicle and I'm already starting to hate it. I've seen similar threads/topics but no definite answers. I also believe my zf6 shifter is fkd because it doesn't go into "performance mode" and every time I open the drivers door it beeps at me and displays "transmission not in park" on the dash. However I believe that is a separate issue from the surging I'm getting. I'm going to install a new shifter hopefully on the weekend if I can find one and hope it fixes that issue. I'm also going to give the zf6 another drain and fill (2nd time) to see if that changes the behavior but I don't think it will. I've taken all sorts of drives with it and have no DTC's (fault codes) showing on FORscan. I've had a little play with logging the live data but to be honest I have zero clue what I'm looking for. This only happens when at cruising speed (gentle throttle) or when I'm trying to go up hill the surging gets worse, almost as if it hesitates to drop back a gear. I should also mention the shifts from 3rd-4th feel quite odd. I'm going to try and upload a video of it and try to link it here. I assume no codes probably means the solenoids are okay? I'm really hoping it's not the torque converter. Please feel free to ask many questions and if anyone has experience anything similar please let me know. I'm hoping to use this thread to diagnose, fix and actually report back to what the issue was and what fixed it. PS. I also want to thank you guys for helping me over the past decade with fixing the falcons with your awesome knowledge and experience, cheers.

Hi there im new to this but just wanted to discuss a problem ive had with my ford falcon fg 2009 with a auto zf6hp26 transmisson, so its my partners car and shes been driving it for a couples weeks noticing it making a werid rubbing sound now and then around 50-60km/h and now it got worse by it surging when in second gear in between 1-2 revs would rise and go down quickly , I took it to a transmisson specialist and he told me theres a 5% percent chance it could just need a service or its pretty much had it but he was pretty certain on it being done , now I myself like to work on my own cars other then paying thousands of dollars so I was going to do a whole transmisson swap so I got a hold of a second hand one in good condition and low kms for cheap . My friend told me to check the level of the transmisson oil so I took the filler plug out and very milky oil started bursting out . Firstly im thinking how is there water mixing with it and it shouldnt be so full so I let most of drain out till its at level with filler plug . I check my radiator water just to make sure and then theres milky substance in there aswel . It should be super clean cause I only just done a flush and fill on the radiator a couple months beforehand. I look online to find out where the water and oil are close together and I find out its the only part I know to my knowledge is the heat exchanger, so I go ahead and replace that with a second hand one I got with the trans and with the old one I try pressure the hose through the radiator input on the heat exchanger and block the output one to seen if water comes out of the oil lines . No water came out of the oil line so im guessing it must only happen when its under heaps of pressure and very hot if its not that then there must be another meeting point were the trans oil and water meet ? But any way I got rid of the milky water out of the radiator and topped it up with coolant and left the milky oil in the trans and took it for a drive it drove way better and stopped surging so I might try doing a drain and refill on the trans till it runs clear then service . But im only hoping it works . Sorry about the big story but itl be better if I said everything , if any one can help or give me tips on this il be greatly thankful as I dont much but trying and trying to do this on a low budget

Hi there I wanted to discuss a problem ive had with my ford falcon fg 2009 with a auto zf6hp26 transmission after swapping with a second hand one , so me and a mate done the swap of transmissions and we swapped the tcm around aswel , now im getting a system coms fault and ive had a friend come in and scan it with a proper scanner tool and its saying it a shifter module fault ? he has tried to clear it but it just pops up again . has anyone had this problem or know the solution ? thanks in advance