Differential Question

Thanks for the help. This is what I was trying to do. I have a set of 4.10's in the car right now. That's cool for going to the dragstrip and around town. But I would also at some point like to take the car on a trip, like a caravan to the Mopar Nats or something. So I looked into one of those Gear Vendors overdrive things. And althought they are super nice, they come with a super high price tag! Then I thought I would just do another center section. That way I can just leave the 4.10's in for around town, but then when I want to take it on the road, then I can switch in some highway gears. I had the original center section that came out of the car, but I cannot find the stupid pinion anywhere!!! That differential is a open type out of a 741 case. I have another 489 case and some highway gears 2.76's that are from a 489 case but no center differential section. So I was going to use the 741's differential part with the 489 case and the 489 highway gears, that way i would have a cheap center section that didn't cost loads of money. So what do you think? From what you said it should work, just wanting to give more details as to what i am doing. Thanks again, this board is great!

Dan