Thanks! To be honest the longest I've been on the highway is 30 minutes and that was enough for me lol. We are planning some cruises that are an hour each way so I'd really like to bring the RPM's down and as mentioned, the 500" motor doesn't care what gear is back there, it's an animal with 3.55's so I'm sure 3.23's would be fine, heck a 3.08 would be great but I've only seen 3.23 and old 2.76's available.

I had a friend that put 3.23's in his car and his converter would slip to 3800 just trying to drive around town since it was way too loose for highway gears and wasn't locking the converter up, that's why I'm thinking of tightening mine up some since I've already experienced some slip with 3 people in the car.

My last couple Mopars ran 9's in the 1/4 mile with 4.56 gears and 8" converters so this highway cruising stuff is new to me lol. I'm dying to get a GearVendors overdrive $$$.