This may be a bit of a ramble but...
I picked up a 95 dual cab recently which had a few similar issues. do a search for worn main shaft splines, R380 and youll find some nice pictures of main shaft worn +50%. i did the cheap fix of fitting a new transfer input gear which engages on more of the splines. This removed most of the gear backlash. Just converted front bearings to oil yest, short axle CV had worn splines at flanges (dry from poorly maintained greased bearings) so I slipped in a CV from my disco. No backlash now!
After replacing the t-belt (original as far as i could tell from paint marks and very untouched bolts) with 170k (just lucky) on the clock I adjusted the fuel stop on the inj pump, that fixed the turbo lag to a certain extent.
The vacuum on a 300tdi is generated by a cam driven vacuum pump... it is located behine the injection pump. Oil leak may just be from the vacuum pump outer face... this could explain both the oil leak and the lack of brake vacuum.
As you have already stated... just get it and deal with the little dramas.
(after pulling a toymotor puslux 2.8d head off today... once again Ill take english engineering over a toyo shambles anyday)
anyway
Steve
'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
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