What to look for on used Def TD4??? HELP!

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Originally Posted by roadkill

Is it a real dif lock, or does it just engage a lower ratio??, it seemed a bit weird to me

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a small contribution:

This is probably a sign that low range and the CDL have rarely been engaged....the linkage probably only needs lubrication and some use..

Sounds like a good pedigree.

Corrosion in the doors should be looked for.

BTW it is a 300 Tdi engine as opposed to the earlier 200 Tdi (pre 1995) and the later TD5 (MY 2000). This might help in your searching of this forum and others for technical info.