You can import JT files as 3ds Max Body Objects, support for the JT format is provided by Autodesk DirectConnect. You may also find some dedicated 3D model converters like the Babel3D that should be capable of JT to 3DS converter.
Convert JT Open CAD 3D model format to 3ds Max (3D Studio MAX) graphics.
We have found 4 software records in our database eligible for .jt to .3ds file format conversion.
Microsoft Windows software - convert jt to 3ds on Windows
A widely-used 3D animation application from Autodesk
Convert from jt file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jt to 3ds. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A 3D CAD translation softwate
On-line services software - convert jt to 3ds on web
A commercial online CAD converter
An online CAD conversion service