Do you all think it is a good idea to use a oil pump what you use to pump motor oil out of a boat to pump the oil out of my rear end rather than unbolt the cover. This way i don't have to put on a gasket and sealant and deal with all of that. Also, how many quarts are in our rear ends? Im thinking 2-2.5.

 

You would never get all of the old gear oil out and you would also be unable to clean in there and inspect. The pump does work good to refill it though, thats what I used.

 

pumps a good idea i usally change the diff fluid with a pump every other time i change it but as stated taking the cover off is the proper way, but i change my diff fluid often i tow alot and have a lead foot lol
can't remember how may quarts but you want it 1/2 an inch below the fill hole

 

I sucked my fluid out of the cover hole when I did mine at 1500miles. When I get to 15kmi, I'll drop the cover and do an inspection.
As far as the gasket is concerned, all you need is rtv sealant. I use Black Permatex 1-minute gasket maker and that stuff sits up very fast and can be driven immediately. No waiting overnight or a few hours for skin over so you can pour in the fluid. It's a bolt and go sealant. Expensive, but worth every penny IMO.

 

Definitely pull the cover so you can inspect the innards and clean it out better. If you tow, you might consider an after-market corner. I put a PML on mine -- four quarts of 75W-140 and seven ounces of friction modifier.

 

I vote to pull the rear cover as well and clean and inspect everything. If you are going to do it, do it right or not at all. Just my opinion

 

I know you all are going to disagree ha but this is just a test to see if changing the oil cures a problem. Im having gear whine and my oil smells and looks burnt. Anyway, i wanna just do a quick oil change to see if it fixes it. If i pull the cover and see worn gears and all that im screwed anyway because I don't have the $$ to buy a tru trac and gears and all the other BS. It's basically just a quick test but If it still acts up, im waiting till it blows. Other than that, hows this wish list. I want to hopefully get a Detroit tru trac, motive gears, get the master install kit, mag hytech cover and royal purple oil. Is there anything else I would need? Also, I noticed that the gears all say 3.90 not 3.92, whats up with that?

 

Don't be lazy, its an easy job as is already. Pull the cover and get all the crap out. Plus if there is a magnet on the cover clean it as well so it works properly.

 

The wish list sounds about right. There is no real difference between 3.90 and 3.92. If you're running 20s and do much towing, you might want to consider 4.56s They may improve your stop-and-go mileage, but will hit the highway mileage a bit.

If mine ever gets to that point, I'm thinking 4.10s with a DTT. The combination of 285/70s and 3.55s are giving me a net of about 3.30 Kinda weak off the line, but it'll have to do for a while.

 

i just did my rear diff for the first time ever in my life and it was super easy. Just go for it