[updated:LAST EDITED ON 19-Nov-02 AT 07:22 PM (EST)]>Yes, you can change the gears in the rear end. It is
>reccomended to have a knowledgeable person do it. It is
>probably about $400 to get new gears installed.
>You may be able to find a complete axle at the wrecking yard
>that has better gears for mileage. That would cost less, but
>you don't know what you are getting. You would also need to
>know how to ID the different axles and gear ratios.

how to ID the different axles and gear ratios.
is there a book or a site with the IDs.
I got a 68 f100 longbed with a 390 everybody says its 3speed with 4th granny. i dont know what kind of trnny it is.how would i find that out.is there an id# on it.or it there a book or site on that.please dont bash me for being stupid i just love my truck.plus i have a 7yr old son maybe i will learn enough one day where i can help him in the future.not trying to sound soby just wanting a little more knowledge