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Of course. Every autozone/pepboys type place will have them. They are usually under $10. Just cut the top of the bottle off so that you can get the shaft of the pump in. I usually reuse the first cut bottle for the rest of the job then so I don't have to keep cutting the bottles (or myself...)

 

How often would one change the oil in the rear diff?

 

Officially, it's filled for life. Change the oil if the fluid ever gets contaminated, like when launching or retrieving a boat, otherwise forget about it.

Unofficially, I'd do it every 80-100K miles or so, or if/when the limited slip clutches (if applicable) start chattering a little, whichever comes first.

 

I use a section of vacuum hose (or something similar) and wedge it over the spout of the oil bottle, that way I can turn up the bottle and squeeze it out.

 

I would do it every 30000-50000 miles...whats normally recommended.
cant hurt to keep it maintained...well besides hurting the wallet

 

IIRC, the rear diff fluid is supposed to be "lifetime" fluid. Just for normal everyday driving, that may be fine, but if you do heavy duty activities (towing, offroading, etc), then your suggestions sounds good.

 

I am not gonna trust that the fluid can last a lifetime unless they give me a lifetime warranty on it. No matter what fluid, it will breakdown after so long and there will still be metal shavings in the fluid.

also, why would a company put a lifetime fluid in it....when they could use regular fluid and get people to have it changed more often...thus help dealerships make more money?

 

They get you coming & going... By advertising it as "lifetime" fluid, the new-car salesman can toss that out to you as another selling point... And then once you own the truck, the service advisor can realistically say "no fluid is lifetime", and thus get you to pay for the service...

 

does anyone have a write up with pics on how to change the oil?