4l60e builder
I know of:
Monster
FLT (Finish Line Transmissions)
Performabuilt
RPM Transmissions
WARRANTY is a must as obviously they are not cheap (which is why Monster is most likely out). Car currently has 560ish rwhp / 500ish rwtq on street tires as it does not go down strip currently. Eventually it will be when fab9 shows up and is installed.
Performabuilt and RPM will both treat you well. Both have very capable 4l60e builds.
Call and talk with both and find what is best for you.
Also, use the search function. On the very first page of this forum, there are testimonials and reviews that you can read. Seriously, people need to start using the search function
I've personally owned the FLT unit and couldn't have been happier with it, they are also local to me so that would be my first choice but the other two shops are great choices as well. I know another local member from this site with an FLT unit (Level 7 I think?) that's been at your proposed future power level for quite some time, and the trans has been great from what he reports.













