mmmm thanks but im up in northumberland. just been goggling transfer box loads of advice saying if changing transfer box then advise to change viscous coupling aswell but it a messy job to detach from prop shaft. do you think it is worth trying to get a second hand prop shaft and vc unit together and just change with transfer box or wait to see if these have gone aswell? also what is a cv joint?
The transfer box, or IRD (Intermediate reduction drive) is a known weak component in the Freelander 1 design. It takes a hell of a hammering and its not really up to the job. It has to be force cooled to keep the oil working. Forget the rubbish about expension rates and oil life that is mentioned on this site. Without the cooling it would overheat and fail. A grand doesn't sound too far off the mark but a lot of money regardless. The unit is normally in the region of £400. Fitting is a strip down of the front suspension and various other items, so the labour is going to run to several hours, hence the high cost.
As far as the VC is concerned. If the VC fails then it will cause the IRD, and possible the rear differentual gearbox to overload to the point of rapid failure. By the sound of what happened to you it may well be the VC has siezed up. However, if your car is high mileage then the IRD may well have just reached the end of its life. The two propshafts, the VC and the bears that hold them are not cheap. I recommend that, assuming you go ahead and get the IRD replaced, that you then assess the health of the VC, rather than blindly replacing it. I suspect it would be cheaper to replace the VC and its bearings rather than sourcing a second hand propshaft assembly, quite simply because you have no idea of the history of the 'new' VC. This may let you down just as quick. If our VC is dead then get a new one.
A CV joint, or constant velocity joint, is the flexible joint in each driveshaft at the point where the shaft leaves the gearbox. It allows the driveshaft to bend and reach, to the wheel hub so to let the wheel move with the suspension.
Let us know how you get on.
For what its worth, we sympathise (well I do) with your news. Its something that could happen to any one of us, and has to some already.
Good luck,
Dave