If you are interested in learning more about doing it yourself, then here are some good install articles.
http://www.differentials.com/install.html
http://www.drivetrain.com/ringpinioninstal.html
That a pup in your avatar beside the big dog? Huskies?
http://www.differentials.com/install.html
http://www.drivetrain.com/ringpinioninstal.html
That a pup in your avatar beside the big dog? Huskies?

) my Cruiser after 6 months of being deprived and did a test trek of SF to Flagstaff (planning to make it all the way across in May) this weekend. I really stuggled at elevation and incline. I thought the tired 350 could be the cause but this thread has me thinking I may have the wrong gears. I run 32's and a 5 speed.