78W72 – LOL touchy subject for many. I run a 2004R stage 2 from Extreme Automatics behind a 455 with about 575 each of TQ and HP. Two seasons now and absolutely no issues. I push it but have not run my car on a track, but from the performance so far, I am not worried about doing runs. From my TH400, the shifting is also vastly improved. On the highway dropped 500 rpm, which is why I went OD. I researched the heck out of this and there is a fear factor out there. For that reason, I went straight to Lonnie out of the gate. My understanding is the difference from behind a Grand National is the big TQ numbers the 400-455 has. This is just for info from my experience, and definitely not an opinion. Plus it slapped straight into my F-Body with same drive shaft, cross member etc. Easy peasy.
|