Just as the oil in the gearbox and engine needs to be checked and changed, so does the oil in the transfer box. Checking and changing the oil in the transfer case is not as easy as checking and changing the oil in the engine, but it is still a relatively simple job. The SJ410 transfer box holds 1.2 pints (0.7 litres), while the SJ413 transfer box holds 1.4 pints (0.8 litres) of SAE75W-90 oil, and like the engine, it is not wise to overfill.

Suzuki SJ transfer box oil change...

Begin by placing a bowl underneath the transfer box to catch the old oil that is to be drained out. Next, remove the oil filler plug - you will find it most frustrating to have drained out all the oil only to find you can't remove the plug to refill the diff again. Now make sure the bowl is still in place to catch all the oil, and then loosen and remove the oil drain plug. After a while all the oil will have drained out, and the transfer box will be as empty as it is likely to be under the circumstances (there will always be a residual amount of oil left in the casing).The red arrow shows the drain plug, while the yellow arrow shows the filler plugReplace the drain plug and start to refill the transfer case with new gearbox oil until it just begins to overflow out of the filler hole. Replace the filler plug and it's as simple as that ! !

Filler plug tip...

If the filler plug is really locked tight, and cannot be removed, you can remove the gear lever and fill the transfer case though the top of the T-case.Just be careful not to overfill the transfer box, too much oil is just as bad as too little oil.