I'm sorry to here that, but I knew it would, as the saying goes [ been there and done that ].
The Bullitt is different when it comes to changing the gear. What are you going to try now? A tune, change it back or you got another idea?
I have installed them [ 4.09 ] in my 2019 GT350, with no issues.
My first 1964 1/2 convertible, my current 2019 GT350, and in between.
1965 couple
1966 couple
1969 Grande
1969 Mach 1
1985 LX
1986 GT
1989 GT
2007 GT
2019 Bullitt
Total 11
Mine stopped working about a month ago at 700 mi, very hard to find 1st. lol Dealer ordered parts [ haven't heard back from them yet ].
But kept driving it, after about a week or so it started working again, doing just fine now, go figure.
If they did, I can guarantee if there wasn't a way around it, they would have never sold me one. I don't want anything I have to take the dipstick out everyday.
These are back for sale, as some one on here PM me saying they wanted them, but haven't answered an PM since then.
Anyway they are available, I can also do paypal now, got it fixed.
I see where you say you've done a lot of racing with fast cars, just curious what you raced and how quick did you go?
Love talking drag racing, as I done a lot of it also for about 25 years, sure do miss it.
Like hearing about others combinations and how it did.