Ok so I pecked up a 90 tracker, I found that there is no lock for the rear door/trunk, is there something im missing? can I just change the rear door with one that has a lock and just re pin the lock cylinder, or is there something on the body that im going to need to get as well? also is a 4 door and 2 door rear trunk/door different?

mine-
1990
2 door
softtop
geo tracker

thanks

Soft top has no lock.

Soft top has no lock.

can I put a hardtop one that does?

The rear door should have a lock.  I even installed an electric lock's on my 96.  Does it not have a lock cylinder?  You can grab a door from any 2 door up through 98, you will just have to mount the appropriate mounting hardware.

I realize some think it is silly to lock a door that has a zipper directly above it, but nobody has broken into my Tracker yet.  Just keeping the honest people honest.

theirs no lock, no lock cylinder, no hole for a lock nothing

Weird.  Well, the doors are compatible between all the two doors, they just have different mounting hardware for the soft top.  I would find a rear door the right color and swap it on.

theirs no lock, no lock cylinder, no hole for a lock nothing

That is odd.  I don't think I've ever seen one without a lock.  Got a pic?  I'd like to see it (not that there is anything to "see" ).
As suggested, just get a tailgate from any 89-98 trackick, they should all interchange.

Yup. My 90 tintop has a lock. My 90 convertible has NO lock. But my 95 convertible does have a lock. So somewhere along the line it was added but initially wasn't available on the early models.
And you can't swap a 4door/2door tiptop rear door to/from a soft top rig because the upper hinge is mounted completely different.

I know they didn't "add" the lock at some point and that it wasn't available on the early models...because I had an 89 with the lock, and I am pretty sure every other early model trackick I have has the lock (90s, 91s, etc....I don't think I currently have an 89).  Now, it may have been an option to either add or delete it on some models.
Of course a TT rear door won't fit a convertible....I was talking about convertible tailgates.

my 91 tracker has lock

My 94 doesn't lock.

Dealer options are interesting. 

Dealer options are interesting. 

I really don't think rear door locks fall into the category of "dealer options".

I have had a 90 Sidekick conv, a 91 Tracker conv, and a 97 4 door.  All my trackers had a rear lock and the Sidekick didn't have the lock.  Wonder if the difference is between the sidekick and the tracker model, at least for the early years?