Leak: What is it? Why? How do I fix it?
 

Ok well I think its transmission fluid, how do I stop it from leaking? It isnt a bad leak, I wiped it down yesterday and so far all that has formed so far is what you see there, it has not dripped yet.
http://img127.imageshack.us/img127/8488/dscf0237wl5.jpg

Re: Leak: What is it? Why? How do I fix it?
 

That's the speedometer cable. You fix it by putting in a new seal. Unscrew the cable and you will see the seal.

Oops. Forgot to say it might just be loose too.

Re: Leak: What is it? Why? How do I fix it?
 

There is a small seal inside that speedo gear-head housing. The easiest way is jack the rear of the truck high and remove the cable then the gear-head housing. Slide the gear out of the housing then stick a small screw driver in place of the gear pushing the seal out. Be careful because there is a small wire ring holding the seal in place on the outside.

They do have tools to remove and re-install this seal without removing the gear-head housing but they are a bit expensive.