2018 Mustang GT 3-4 shift fork broke

Discussion in 'Issues, Repairs, Warranty, TSB, Recalls' started by t14mhall, Sep 6, 2019.

  1. ctandc72

    ctandc72 Well-Known Member

    Vehicle(s):
    '19 GT 6 speed Base
    Joined:
    Nov 1, 2017
    Location:
    VA
    Posts:
    1,220
    Likes Received:
    604
    Garage Profiles:
    1
    0   0   0
    @Cobra Jet he definitely has experience in this area. But if you DO go that route - you're going to end up with the same dealership who screwed this up (multiple times) installing the new transmission. By techs getting yelled at by their bosses.
    I'd call another local Ford Service Department - get the Service manager on the phone and tell him what's going on. You might be shocked what a competing dealer would do to help.
     
  2. GT Pony

    GT Pony Well-Known Member

    Vehicle(s):
    2015 GT Premium, Black w/Saddle, 19s, NAV
    Joined:
    Mar 13, 2015
    Location:
    Pacific NW
    Posts:
    7,510
    Likes Received:
    1,932
    0   0   0
    Hummm ... seems I could put a lot more force into the shifting mechanism with a 2 ft long shifter vs a 4 inch shifter. Longer the lever arm, the more force applied on the other end of the fulcrum.
     
  3. usgiorgi

    usgiorgi Well-Known Member

    Vehicle(s):
    C6 Z06
    Joined:
    Jun 22, 2016
    Location:
    Fairfax, va
    Posts:
    703
    Likes Received:
    153
    Rating:
    100%
    1   0   0
    The amount the shift forks move does not change. The difference will be how fast they move. Since you're able to shift faster with a short throw shifter, the force is exhorted in a shorter time period than with a longer motion. At the end of the day, you're right about being able to leverage more force with a longer lever, but the point I was making was about the force being applied in a shorter time span.
     
  4. GT Pony

    GT Pony Well-Known Member

    Vehicle(s):
    2015 GT Premium, Black w/Saddle, 19s, NAV
    Joined:
    Mar 13, 2015
    Location:
    Pacific NW
    Posts:
    7,510
    Likes Received:
    1,932
    0   0   0
    ^^^ To add, a longer shifter lever arm from the fulcrum gives a higher force on the opposite end of the mechanism. Of course pulling the shift lever faster means more force is being used to do so. But in a situatiin where the shifter was moved at the same exact speed, a driver would have to put more force on a shorter shifter in order to get the same force on the shift forks compared to a longer shifter lever.

    Banging gears as fast as possible (ie, max force put on the shift lever) means more force will be put on the shift forks with the longer shifter. Just driving around normally, the difference of force on the shift forks won't be much different because only enough force to make a mellow shift is used. But maniac gear banging has more potential for shift fork damage with a longer shifter lever.
     
  5. Icarus

    Icarus New Member

    First Name:
    Rex
    Vehicle(s):
    2018 Mustang GT
    Joined:
    Feb 17, 2020
    Location:
    Aurora
    Posts:
    3
    Likes Received:
    0
    0   0   0
    Hey all. I too have had the broken 3-4 shift fork. I was impressed with the trans when I first drove the car, had to have it, coming from T-5 Foxes ( car had 6600 miles when I got it). A handful of times in the six months since Ive owned the car did I encounter a missed shift to 3rd gear at higher rpm, never had problems with hitting any other gears. Since we can't stop thinking about these little non-critical, annoying things, I started with a BG synchroshift II fluid flush (13,000 miles). Better shifting when cold but not revolutionary, otherwise just gave me peace of mind. Then I thought the shifter was maybe what would cause that rare missed shift. Worried that i would void warranty/catch hell from dealer if i ever did take it in, I kept it simple and went with Steeda short throw handle, complimented by their rear trans mount bushing. Firmed it up, felt a lot more solid, kept a majority of stock parts. Then on 1/22/2020 while shifting into 3rd, under normal conditions, the car acted as if it hit neutral (19000 miles). Checked the gate to 4th, same deal. Brought the car to my house, called dealer, drove her down. Was well informed myself, thanks to this site, on the TSB on this issue. I have to admit, I took it to worst case scenario in my head and assumed they wouldn't cover it on the way down. A week later, they called to say that it will get a new transmission. At no point did they mention anything about shifter/fluid/driving habits/Steeda tune on car. BTW, my car build date is 1/18...I believe most problems have been around that build date. The simple and direct candor of the dealership tells me they know it's a problem, fix em up and keep the customer happy seems to be the MO. I really hope what they put back in is up to snuff...amazes me that it's gone through a trans at 19000! I think about that A10 everyday lol. I remember reading these forums on this very topic and thinking "Gee, hope that doesn't happen to me". As of now (2/17), I am waiting on the car to be returned to me. Sucks that Ill pay a month's car note for it to sit in the shop for a problem it was born with. I'll post an update when she's home.
     
  6. Icarus

    Icarus New Member

    First Name:
    Rex
    Vehicle(s):
    2018 Mustang GT
    Joined:
    Feb 17, 2020
    Location:
    Aurora
    Posts:
    3
    Likes Received:
    0
    0   0   0
    Update 3/09: Have had the car back for a few weeks, put about 600 miles on it. Replacement trans is working well. Haven't experienced any lockout of third; in fact, all shifts have gone smoothly, even at high rpm. Don't know exactly if it's a 19/20 trans, or an 18 for that matter, but i have 40,000 or 3 years to find out if it's weak. Figure I'll just start putting money into a future Tremec fund for when she is out of warranty.
     
Loading...

Share This Page