Gear box oil & General service Q

[Blangs]

How often should the gear box oil be changed in the 5sp, open diff? I have joined the nobleparts forum for the downloadable service guide however my profile has not been activated. The car is due its 7th service (i have to confirm) and resides currently at 26'000 miles.


Kind Regards,

[BobE]

The service sheets show a gearbox oil change is required at 12K, 36K and 60K miles.
The service intervals for Nobles are every 6K miles with different checks etc depending upon which one is being undertaken.