Gearbox Oil Change Frequency

I would go 40,000 klms or 2 years whichever comes first assuming you are not going through deep water

I think the servce intervals for the later 70 series such as yours is actually more than this (i will check tomorrow)

Regards Don

My 94 model has oil changes every 100,000 Ks , and each time Diff's , G/Box, T/Case , is changed I add the product as depicted in all ,
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I do it with the forty thou recommended service except I do that at 50000. the difs and gearbox/transfer dont take a lot of oil so it not expensive and small price to pay for peace of mind. If you have LSD dif it definitely needs changes. I use the recommended oil and I dont believe additives help the formula.

Change the brake and clutch fluid too. Brake fkuid absorbs water from the atmosphere and will cost you plenty as I have learned to my own loss.

Owen

I guess the best suggestion is to do more travelling in it

I do 12 -15k a year and do those oils every 2 years.

they can collect water and shavings off of cogs so it probabally is worth doing them evry 2 years or so in your case