Living with 3.91's

518 AOD will fix that highway RPM thing. :cheers:

I'll have mine all wired up and operating as a 4spd this winter once I get the 2.45s out of my axle. I'm going to 3.55s because they were more or less free.

I could go higher, but I'll be running 26x10s on the back, and around here "highway" means 80mph+...so the 3.55s will be fine.

Our Swinger 340 had 14" wheels and 3.91s and it was great around town. We didn't do lots of highway driving, so it wasn't a big deal.