SHELBY GT 350 Member
Joined: Jan 2011
Location: Central Massachusetts
I have run the original fluid, Mobil-1, and Amsoil in mine; and I think the Mobil-1 and Amsoil were both a little smoother shifting than the original, but not a big difference. There was a thread on here with a "better" fluid but I don't remember if it was the Havoline or Pennzoil; but that's what I was going to try next time I change it. (I have been changing it every couple years because I road track the car)
Regarding 80 MPH in 2nd -- that seems a bit high from what I remember, from when I had the original 3.31 rear gears in mine; and I calculate 70 MPH at 6,500 RPM in 5th with the original 235/50-18 tires and 3.31 rear. Do you have taller tires or taller gearing?
| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day