I have a GVOD in1 vehicle (hotrod) and are currently getting ready to install another just purchased into another vehicle (work horse). These are the cat's meow for all applications from motorhomes to hotrods and work horses. They allow you to split all your gears plus act as a final OD.One thing I can tell you from experience is to pull your 12 volt power straight from your battery (Think Stereo) and switch it with a relay. These things get their operating signal from a pulse generator regulated by the speedo circuit/cable, and are very prone to radio frequency interference or RFI produced by your ignition system. Your battery is one huge capacitor and will eliminate most RFI problems along with running shielded wire.

Do you sell parts to rebuild these ?

Meow .....I'm installing one in my 1971 gremlin with 727 shift command yeah