Rear end question.

[Bones68charger]

In my 68 318 car can anyone tell me what kind of real axel it has and what gear ratio it is? Also, what gear ratio would you suggest for a good street gear but with more umph if you know what I mean? I still want to be able to drive it on the highway. This might be a retarded question but I am not a mechanic and still learning... Is it possible to make it posi without replacing the whole rear end?

Thanks

Bone

[andy74]

look at where the center of the diff is,if the bolts go in the front its an 8 3/4,real easy to swap pumpkins and get 3.55 and sure grip(no posi in a mopar)if the bolts go from the rear its a 8 1/4,which is a bigger job to swap,and given your experience will probably be better left off to a pro,either way a 3.55 would be my choice for rear gears

[mally69]

more than likely you have a 8 3/4  but who knows what peole do to them   http://www.moparts.com/Tech/Archive/axle/6.html   try this link and compare yours to this chart it will tell you which rear u have

[mally69]

i  would have to say that 3.55 3.73 gears would be ideal for highway and street i have 4.10 in my charger and im defintly better off in town than i would be on any highway  to high of rpms on the highway for my car

[Bones68charger]

Thanks for the help, without you guys I would be totally lost!