About how much fluid should I expect to add to the front and rear diff's if i drained them? And any suggestions to a good 90 weight gear oil to use for this application?
All dumb comments like "until they ae full" will be greatly appreciated!
The diffs take roughly 3.5 quarts each. 7 Should do both, but the front uses a bit less and the rear a bit more. Believe it or not, you fill untill they are full-ie the oil runs back out the fill hole.
Any name brand 80w-90 will work well. If this truck is new to you, I'd run a cheap gear oil for a few months to flush out the diffs and then run a synthetic like Mobil 1 75w-90.
On a side note (reads hijack) Does a lift change the amount of lube the diffs can hold? I would think the change in caster would make a little difference, prolly not much but a little?
IIRC 2 gallons does the front rear and transfer case,
you will want to change that fluid in the transfer also, hardest working two quarts of fluid in an 80 series. might as well as do it at the same time you will already stink of 90wt.
IIRC 2 gallons does the front rear and transfer case,
you will want to change that fluid in the transfer also, hardest working two quarts of fluid in an 80 series. might as well as do it at the same time you will already stink of 90wt.
I love the smell of 90wt......Usually it means I've been near a landrover....or working on the cruiser...I just changed the rear diff lube thge other night....next up as time permits transfer/front diff....
I love the smell of 90wt......Usually it means I've been near a landrover....or working on the cruiser...I just changed the rear diff lube thge other night....next up as time permits transfer/front diff....
as far as the impact of axle rotation and a lift....can you jack the front end or rear end up enough to rotate the pumpkin so the fill plug is "level" again"
On a side note (reads hijack) Does a lift change the amount of lube the diffs can hold? I would think the change in caster would make a little difference, prolly not much but a little?
It would make a difference but it is not an issue. Fill it till it's full. More is better IMO, but it's a "guideline". Big gears in an oil bath. As long as they're splashing in the oil they'll be happy.
After you flush out the diffs with some conventional oil I would reccomend Red Line 75-140w if you plan to abuse it off road because if definitely offers more shock protection for your gears. Royal Purple, Mobil One and Amsoil also make a great gear lube that will protect your diffs better than standard lube.
I used mobile 1 synthetic. 75w90. I let the fluid drained overnight. Front was close to 3 quarts. Rear ran out after 3 quarts. Need to buy more. Don’t use the syringe pump. Faster and easier with the cheap harbor freight one. Tip. Use a cardboard box so the hoses won’t touch the sandy pavement and to contain everything inside; catch the overfill. I placed the pump against the axle and pump. Easier than holding it with your left or right hand. Make sure you replace the washers.
