I can't help you with your ? Gearbox noise issue, because I'm not there to hear/feel it but the handbrake is an easy fix.
To replace the oil seal at the rear of the T/case, chock the vehicle and make it safe before getting under it, you will first need to drain the oil from the T/case, while that is draining loosen the 4 nuts that hold the prop shaft to the output flange in the middle of the handbrake assembly, then undo the 4 bolts at the differential, remove prop shaft.
Now remove the split pin in the castellated nut, undo the nut, slide the handbrake drum and output flange off the splined shaft.
Next remove the split pin and undo/remove the pin attached to the bell crank off
the chassis, this has then effectively disconnected the handbrake.
Next step is to undo the 4 nuts that hold the handbrake assembly to the T/case, for this you will need either 5/16"whit worth socket/ring spanner, undo and remove this housing, the seal is in that housing from memory, seals are the same for S2/2A &S3, while you have the output flange out,check the running surface for a wear mark, if you can see a line in the steel, or feel it with your finger nail, you will either have to replace that part or buy a speedi-sleeve otherwise your new seal will leak, refit is the reverse, and don't forget to refill with oil, hope that's of some help to you, not a big job at all, cheers Dennis
Ps from your image it would appear your 88" could be a late model S2AGS (ex.mil) it appears to have the raised chassis??.
pps here is image of the housing where the seal is, this is a very s/hand spare, occassionaly when you undo the nuts that hold the h/brake assembly the studs screw out as you can see in this image, and it is upside down on a shelf,,.
http://i659.photobucket.com/albums/u...0/IMG_1066.jpg


 
						
					 
					
					 
				
				
				
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