Land Rover Repair: Engine Replacement, land rover discovery, zf transmissions

Question
My wife has a 2002 Land Rover Discovery II SD7, that has 75000 miles we were trying to determine the average life expectancy of these engines/transmissions and the cost to replace?  She recently took a job where she will be driving a lot and we wanted to assess her car situation.

Answer
If treated well, LR engines can go over 200,000 miles.  My '95 Range Rover has 145,000 and is still running strong.  I commute 40 miles per day in Darcy.  The ZF transmissions rarely fail, when they do it's typically a slow death, not outright failure.

Rebuilt transmissions are about $1200, I can't estimate fitting costs.

Engine replacements are not cheap, appx $4,000 for a new engine, used engines can be found between $1-3,000.  

Unless you have problems now, the engine and transmission should serve you well.  It's all of the little things that get you on a LR, typically not the big things.

A great resource for more information than I have is
www.discoweb.org, or www.rangerovers.net (same engine/transmission combination)