Changing oil in differential
#11
If they are a reputable shop and not over charging you for the work it would be a good opprotunity to do a visual inspection on the gears and bearings. These cars are pretty old and one of the things thats that get over looked while doing maintenance is the rear end. If you don't care about that stuff just suck it out and put new in.
#12
The disadvantage to removing the diff is you have to replace the seals and gaskets. I don't see the big attraction for having a drain. Ten years from now, if you even still own the car, you might be thinking about changing it again. Lessee, stick tube in diff, draw out oil, pump in new oil, 15 minutes, tops. Or you can pull the axles and diff, clean out all the oil to prevent fire, drill drain hole, weld on drain bung, replace wheel seals, coupla hours. So now having the drain makes changing the diff oil a minute quicker, since you don't have to insert the drain hose. If you change the oil every year (ridiculous, I know) in only 50 or 60 years you might break even on the work it took to install the drain.
What gaskets and seals are you talking about? I just built/rebuilt a 9" and I will not be using any gaskets or seals in places that would be damaged by pulling the pumpkin. RTV where the pumpkin attaches and the bearings I bought for the axles are sealed. All I have to do is put a little rtv around the outer edge when I install the axles. I put in a drain because their was never going to be a better opportunity to do so.
If I just wanted to change the oil in my 8" I have currently would I pull the pumpkin? Most likely, I would want to see what the gears looked like and get all the oil out. You have no idea how much oil you are getting out if you use a pump. I plan on changing my oil much more than once ever 10 years.
#17
Because i want to, going 10 years just doesn't seem right. No its not a racing vehicle but i do tend to drive it hard. I have way to much time and a fair amount of money tied up in it that I will do anything I can to prolong the life of it.
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