Jackaroo manual box & trasnsf. case oil

Another thing I am changing the rear diff oil as well. Do I need to use the Holden LSD additive. Am using Penrite LSD oil.
Will

In my rodeo I had my gear box oil change about a year ago by a service shop, now it feels a lot rougher then before (change), I assume that i must of had gear oil in there and this time they just replaced it with engine oil. maybe that it explains it. Maybe I'll do it myself this time and use the money saved on a good oil, cause all oils ain't oils.

Willb,

I do believe you do need the additive, even if using LSD oil. I think penrite make an equivalent additive which is much cheaper than GMH. There was a post on this topic quite awhile ago (~6mths or more).

I've only ever used Gear oil in my gearbox because I wasn't game to change from 85W to 15W40. Seem like a huge difference to me so I only ever used 85W gear oil but I too have a 5th gear whine. Mind you I've got 160,000km and quite abit of that included towing a 23ft fibreglass fishing boat for 800km at a time, mostly in 5th gear so I can't complain. I might try synthetic gear oil next time. Let me know if it alters your 5th gear whine.

Andrew

Do all of my own servicing re oils on my TD 99 SE Jack - using Castrol fully synthetic - Syntrans 75W85 - in the G box and T case - $250 for a 20 L drum. Drain intervals for the trucks it is aimed at are recommended as 180,000 - I do mine at 50's - have been using it since 10,000k - it reduced the 5th gear whine and that has been stable ever since - touch wood, the Jack runs very well still with 103k on the clock now. I use Castrol magnatec in the donk and change it and the main F at 7500k (has been every 5k until recently - The minor oil filter is now going to be every 20k.The diff oil has been 85W140 LSX Castrol - they advised that the additive was not necesysary. The are very helpful re client feedback but not sure how much they "really" know about lubrication !

Banjo, I used the same transfer/gearbox and diff oils as you. I was also using 10w40 magnatec which was pretty good. I then changed to 5w30 castrol syntheticR and found that the jackaroo ran slightly better on cold starts, particuarly in winter. Thats just my opinion, but if you are having no problems on cold starts then why change!!! Cheers