I need to change my rear output shaft seal and i cant find the steps to do it right they're nowhere to be found i cant find any repair manuals or anything online

Sounds like something is really messed up in the transfer case. First check that the rear driveshaft is intact and fully connected to the transfer case. If so, the transfer case needs to be repaired/replaced.
In 4hi or 4lo, the front/rear 'differential' is locked, so both front and rear driveshafts should receive power. In AWD, the power is supposed to be divided between front and rear driveshafts, but will allow power to go to the shaft with the least resistance (like non-positraction rear end will allow the tire with the least resistance to get all the power). If the rear output shaft is broken, or the rear drive shaft is broken, all the power is going nowhere in the transfer case.

Fix your car right away by clicking the link I attached JAGUAR TYPE XTYPE 2001 2009 WORKSHOP SERVICE REPAIR MANUAL

You should be able to change the shaft seal just by removing the half shaft.

NOT THAT HARD IF YOU HAVE SLIDE HAMMER AND A 3 JAW ADAPTER.TO REMOVE REAR OUTPUT DRIVE SHAFT SEAL AND AND NEED A SEAL DRIVER TO DRIVE NEW SEAL IN THE TRANSFER CASE REAR.OUTPUT SHAFT HOUSING.

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Rear+Axle&partName=Drive+Train&pageId=0900c152801defa4&subChapterTitle=Stub+Shaft+Bearing+%26amp%3B+Seal&partId=0900c152801def19
thats whats needed to repair this. probably a job for an auto technician

Here is a picture step by step guide from autozone:

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?chapterTitle=Rear+Axle&partName=Drive+Train&pageId=0900c1528008f4d4&subChapterTitle=Axle+Shaft%2C+Bearing%2C+And+Seal&partId=0900c1528008f406

How to remove axle shaft seal on hummer H2

Ok Gotcha here we go

1. Output Shaft has A Brass Bushing in tail shaft housing that supposed to minimize that Play the clearances vary but you R right Shouldn't be a lot of UP-DOWN Play look in to that.
2. As for the Seal if it got Bent & or the Spring inside it Poped out it Will not Seal
3. Also If the Yoke Sah A WEAR Channel on it that will Leak Im not sure if they make a SPEEDY SLEVE for yokes or not they do fof HArmonic Ballancers and many other Apps.
4. Otherwise make sure you have the right seal Look for Part # with a Magnifing Glass the # is on the outside Lip of the seal Strange but TRUE
5. Again I cant Stress Enough that it HAS TO GO ON STRAIGHT
6. Also Look for Cracke at the back of thae tail shaft Housing Because if the YOKE is TOO TOO Loose that drive shaft WILL Beat the Seal & Housing into Submision

Other than that It Cant be much more than that . I realy Hope this helps and you can get it takin care of through this, If it Helps PLEASE RATE Me FAIF for this

You must be refering to the side seals. common problem. the actual problem with those rear ends is the air breather, which cloggs up and that's when your seals blow out, because the pressure in the rear end has nowhere to go and so your seals get blown out. I just did a set on Monday. Anywho, you will need some specialty tools for this. You will need to remove both rear brake assemblys (rotors, calipers). Than look on the other side of the backing plate, there you will see 4 big nuts that hold the backing plate on the axle tube (rear end). Remove those 4 nuts and that's where specialty tools become usefull. You will need a slide hammer. You need to attach the slide hammer onto the axle right by the studs. Use factory whel nuts to attach. Remove axle out of the housing with few good slides of the slide hammer. Once the axle is out, you need to remove the snapp ring, then cut the colar off and remove colar, then remove the old bearing and thats where the seal is. Big help doing this job is a pneumatic air hammer, which helps you remove the stuff off the axle shaft and the slide hammer to remove the axles out. You will need 2 seals, 2 bearings and 2 collars. You may also need the plates with the studs, which had the big nuts, that you removed in first steps of this repair. Kind of a job for someone that has been working on cars and has the tools to do it. Good luck. Oh ya, change the breather and the fluid in the rear end.

there ar two oil seals on your vehicle one is located behind crankshaft pulley and the other is located at rear input shaft to transmission you will need to remove your crankshaft pulleys including pulley boss or transmission and flywheel and torque converter if automatic to change seals are fairly cheap and easy to remove just follow steps in repair manual from local parts store. Or take it to a shop lol.