Diffy gear oil change out tools methods...

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Mar 11, 2019 | 10:41 AM

#16

Franklin2

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And a comment on changing oils: Don't be surprised if you get seal leaks after changing the oil in your diffs. I have had this happen several times, to the point where I am thinking about just topping them off rather than changing the oil. I don't know if the new oil is thinner and getting by the seals or what the problem is. It just happened to me again last year. I changed the oil in the front diff of my 99 Tahoe, and soon after I developed a minor leak at the pinion seal. New seal and now I am good.

Mar 11, 2019 | 11:53 AM

#17

BigBlue2

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Quote:

Originally Posted by Franklin2

I'm hoping that was just a coincidence for you...and that doesn't happen! I'm using the 80w-90, so it's the same gear oil that was in there. Amazingly I have no leaks after 400k miles. Every case I drained this week was full and I didn't need to top off any of them. On change intervals I have seen every recommendation from 25,000 miles to 100,000 miles, sooner if you are fording of course.
It's probably a good idea to change the tranny and rear end at least every 100,000. Maybe you can go longer on the transfer case and front diffy cause they don't get as much use unless you are 4 wheeling a lot.

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Mar 11, 2019 | 12:10 PM

#18

BigBlue2

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Quote:

Originally Posted by matthewq4b

Ya think maybe you're getting cheap junk ones. I have a couple one a strait suction and another with 2 hoses that will suck it up then pump it out had both decades both made in Canada. But both use a standard sized double acting piston seal as used in hydraulic pistons. I bet if you measured the Bore of the cylinder you could find a double acting hydraulic piston seal to replace the chunk of rubber they originally used. ]

If I find a Canadian made lube pump while garage sale'n I'll buy it! When was the last time a lube pump was made in Canada? Most everything now is made in Chinada.

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Mar 11, 2019 | 12:46 PM

#19

BigBlue2

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I used to squeeze gear oil using the tall quart bottles. They roll up very easy and it's much faster than pumping. But the Motorcraft Gear oil came in short square quarts which are not so good for squeezing. I ended up connecting a long tube to the bottle's nipple. Ran the tube over the leaf spring and out through the wheel well. Connected the bottle, raised it and inverted it and then poked a hole in the bottom with a razor knife. Worked well on the front diffy. I'm waiting for my pump to arrive before filling the other cases. I got the longer one that fits the tall quarts because I have one of those tall bottles. I'll just pour what ever I need pumped into that bottle...or you can hold the top above the short quart and pump no problem. I figured the longer tube would be handy for pumping out fluids too.

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