Well the seal on the passanger side of my rear end is starting to leak diff. fluid all on the inside of my rim...So now i got to tear the rear end apart to fix it, since my rear end will be apart u get to hear me ask a million questions about gears again..Ok well, first off a do alot of highway driving, i live 3 hours from home, (in college)..So whats the best gear to go with that wont kill me driving on the highway? im told that 4.10's at 75mph the rpm range is like 2500-2600rpm...

 

There is not much of a difference between 3.73's and 4.10's, maybe a couple hundred RPM's.

 

getting gears is awesome. I have 4.10's and love them. As far as doing a gear change yourself, make sure you have done this before or have someone help you who has. I this is not the kind of mod you want to cut your teeth on all by yourself. and as far as new seals go...get OEM from a dealer, I went with the seals in my bearing kit and they all leaked, so I had them swapped with motorcraft and no more problems.

 

I have changed gears before, Im my ol 90 jeep wrangler and a buddy yukon...