overdrive choices for big block

[jcg]

I'm looking to make my 66 more driveable on interstate. What are all the choices? It is an auto right now 727. What have you done? Was it a good purchase? Any one looking to sell something they might have?

[4264door]

What rear gear ratio are you currently using?

[Racer Brown]

3:55 is a good all around gear!!

[jcg]

3.23. But the speed limit on interstate is 70. That turning the motor at about 3200 non stop.

[4264door]

Another question, what is the over all height of your rear tires?

[jcg]

255/65/15. I thinks off hand

[jcg]

So I take it no one runs an overdrive. Well I'll keep looking.

[4264door]

I took my 1970 Challenger R/T over 150 MPH back in the day and it also had 3:23 rear gears. I honestly don't know if an overdrive is available for your application. If it is it might get pretty expensive IMHO. You could change your rear gears to something like a 2:76 or something like that but it would be a dog out of the hole.

[jcg]

I know that gear vendors works well. I know my car can do the rpms for shorter times. Just looking to save some wear and tear, and maybe some gas. I also know that american power train makes a kit to go stick with 5 sp tremec. Was just hoping to hear what else is out there.

[67r/t4speeder]

There is a guy with a `67 R/T that show's up at the Fremont show out here, he has a GV/727 in there and loves it.