Duster you're reading my mind... I've been thinking about how to handle the highway for a while.
I just rebuilt my numbers matching trans and I don't want to change it. I do like the Gearvendors over drive solution, but not ready to go that route at this time.
I think the best solution for me is to buy a 3.23 center section and do swaps.
Initially I'll stay close to home.
I'm about 25 minutes from Englishtown Raceway Park So it won't be horrible with the 3.91s. :)
That said I will have to address this with a mor permanent solution down the line.