Danny-
I have to agree with Wrenchbender here. Keep your stock rear gears and put in the 5 speed.
At 70 MPH you should be turning less than 3000 RPM and you will still have lots of pulling power.
First time you get it out on the highway you may decide to go through the front end from top to bottom so it doesn't scare the s**t out of you.
Don't worry, rebuild kits are readily available and will get everything right up to snuff.
Good Luck and keep us posted!
Guy
