Advice Pls. Grease in Front Diff Housing-80 series Landcruiser

Hello folks.

Doing some prep for a forthcoming trip I felt motivated to change the diff oil. When draining the oil into a tray, all I got was grease and a slight amount of oil.

My immediate thoughts turned to the inner seal having 'given up', and yet there is no indication of any oil leaking anywhere. I am pretty picky with oil leaks and generally have them attended to immediately.

But firstly - some background. Last week I managed to strip the splines on the hub and CV (birfield) joint. I was able to get a replacement CV and axle from a local reputable wrecker. He told me the unit he was supplying me came from the later model 80 series, when they (Toyota) changed from 15" to 16" wheels. My vehicle, being a 1991 model, has 15" rims. The guy at the wrecker told me that the newer assembly was marginally longer but would be a stronger unit than the one I had just 'creamed'. I am wondering is this may be part of the problem.

My son (a mechanic) told me there was no indication of oil leaking anywhere when he pulled it apart to replace the broken parts.

I thank you in advance for your help, advice and wisdom. At this stage the trip is on hold pending an outcome on this problem.

Thanks.

Jack