Originally Posted by
Leo109
Good point Pat. I use Castrol VMX80 (GL4 spec) in my SIII 'box. Was warned not to use EPX 80W90 or any other GL5 spec oil in Series gearboxes. EPX 80W90 is fine for the transfer case, diffs and swivel housings.
Shonky, another spot to check is the oil level in the steering relay box. If it's all leaked out years ago the steering can be very heavy. It's a few years since I did it but I think the drill was to take out one of the top cover bolts and dribble 80W90 into the hole until it won't take any more. Someone will correct me if this is not correct.
Also, if your front hubs have free-wheeling hubs, engage them for a few kms every few weeks so the swivel oil can splash lubricate the top Railco bushes (and prevents the front prop shaft from seizing/wearing unevenly).
Ian