Transmission (gearbox) related - failure of gear engagement

Dear All,
Thank you very much. And I truly meant it for your quick response. This Jeep was willed to me by my late father hence the seemingly lack of knowledge of model & year. I actually do have a 'Jeep repair & maintenance manual' where there is a section on identifying the vehicle via the VIN plate located on the top (left or right) wall of engine area under the hood. Even so my VIN plate looked nothing like what was shown in the manual.
Back to the issue on hand. Dear Sir (Hmac300), negative. What I meant was that even with the engine off I could not get it to engage in any gear (1-4), Some time back, I lost all clutching while driving due to the top (clutch) pump busted. So what I did then, I shut the engine and shifted into 2nd gear. Started the jeep (in 2nd gear) straightaway and slowly drove home. I'm aware that at very specific rpm you can actually shift gear both ways up & down without clutching but I'm no expert so 2nd gear slow and steady all the way home. But my current problem is that I couldn't even get it to engage any gears (1-4) with or without engine running nor the clutching.
And on to you dear Sir (of CJ Medevac), I do not quite understand what you meant by 'the transfer case bumped into neutral' because its a manual transmission (with 4 gears & Rev of coz). Kindly elaborate.
Once again, thank you all for your time and trouble.
- Michael (username Mahodani)

Dear CJ Medevac,
Apologies for my delayed responses. Having read your replies there's like a bunch of light bulbs that goes blink. Blink. Blink & when I saw your photo particularly of the 'neutral gear'.I felt like a dumb bimbo (or himbo) & began to wonder if I ain't masculine enough for a Jeep.(Of what I see as a real man's auto). I'm definitely gonna follow your advice (to the letter) & will get back to ya on any progress. Hopefully I could address you as St. CJ Medevac in my next reply (your sainthood for being my savior).
Okee dokee. About my VIN no. I have to admit I'm kinda 'embarrassed' on this little issue. I'm actually located in Malaysia (42yr-old male) but I spent about 4 years in the States (Missouri) getting my degree. Back then, I was a biker.I rode a Honda Silverwing 500cc but my Harley buddies were always giving me a tough time (good-naturedly of coz) on me and my Jap bike! A chink on a jap bike! (Well it's not racism if one's refering to oneself rite?) Now you see my Jeep has a Jap engine! A Nissan 6-cyclinder 2.5L engine. I guess that's probably why my VIN info doesn't look like what I see in the manual. Oh boy, now I feel like half the man I used to be, having to reveal this little secret. Hahaha! All the 'machoness' on the outside hiding a teeny-weeny 2.5L Nissan engine. My late dad had it replaced due to the large difference in road tax payment between a 4.0L and a 2.5L engine.
Have to say looking at your photo, my Jeep's dashboard design especially with the large speedometer in the centre & 4 smaller gauges by the side + lighter/ashtray below looks identical to yours. Even the gear shift stick too.
I'm actually working on it - some bodywork, wiring, etc. And will definitely post a picture for ya. Meanwhile, I'm gonna follow your advice and hope for the best!
Truly, truly, truly. Couldn't thank you enough irregardless of the outcome.
- Michael (Mahodani)

CORRECTION!
PLEASE NOTE THAT IT SHOULD HAVE BEEN ADDRESSED AS:
Dear Hmac300 & CJ Medevac;

My apologies to Hmac300. Got too excited reading your reply and incidentally left you out in my opening.