My 68 is noisy as heck going down the road. I mean, yell over the noise loud. It's not just engine noise from the squirrels in the J13 either. I've coasted down a long hill with the rig in neutral and the engine off at about 50MPH and it's really, really loud.

So, I suspect a rear end replacement/rebuild is in order. What is my best option? Is there something newer that will bolt in and give me some more 'legs' for traveling at 60MPH?

Thank you in advance for any help you can provide.