Service Question

[Crmsntide27]

Last time i took my truck to the dealer they said i need to consider doing a transfer case flush, tranny flush, and rear differential service. Truck has 46k miles on it. Doing this would cost me like 500 bucks. Is this something i should consider or are they just trying to get some cash out of me?

[kazmadd]

Do it yourself not to hard

[6point0damn2004]

Originally Posted by kazmadd

Do it yourself not to hard

i concur, and if you do either get a tube you can put on the end of the bottle or some kind of fluid pump for doing the transfer case.

i'd do both axles and tansfer case, tranny that's your call if you wanna do it yourself

for the transfer case there are two plugs, remove the lower plug and i removed the upper to get the fluid out faster. once it's drained put the lower plug back in and fill it up till its at the level with upper plug hole, should just start to ooze out of the hole and then put the plug back in and it's good.

for the front and rear diff. remove the bolts on the lower half of the diff cover and loosen the bolts on the top half and then pull the cover away from the housing at the bottom letting the old diff lube drain out. once it's drained remove the cover and clean it up the a little bit. you'll have to peal the old sealant off the cover and then just reapply black RTV sealant to the mounting surface of the cover. then put the cover back on and tighten it down. once the cover is re-installed just fill it up with the fluid till it oozes out of the fill hole.

a side note, if you have a limited slip rear end you will need to add 4oz. of friction modifier additive to your lube in the rear end


for the transfer case, it just uses regular old ATF and it calls for 2.0 quarts

the front diff calls for 2.7L of 75w90 and the rear diff calls for 3.3L of 75w140

[STANGMAN893]

The machine they use at the dealer sucks it out through the fill hole and then refills through the same hole.You can use a suction gun for the axles for the drain and fill and use it to fill the transfer case.For the most part the axles use 75/140 synthetic and atf for the case.Some front axles use 80/90.

[Erwin8r]

I think the drain procedure above (i6point0damn2004's way) is a better bet--you get all of the old oil out that way, you can inspect the gears for damage, and you don't have to buy any specialized tools. 6point0damn2004 has it pretty down--except that I would remove the fill hole plugs first to ensure you don't have any problems...

[6point0damn2004]

Originally Posted by Erwin8r

I think the drain procedure above (i6point0damn2004's way) is a better bet--you get all of the old oil out that way, you can inspect the gears for damage, and you don't have to buy any specialized tools. 6point0damn2004 has it pretty down--except that I would remove the fill hole plugs first to ensure you don't have any problems...

exactly my reasoning

[STANGMAN893]

I do mine old school somewhat.I pull the cover but fill with the suction gun or I use the machine here.I like to see whats in the cover myself.

[Erwin8r]

Speaking of which, in my Silverado SS, the "ideal" transfer case replacement fluid was GM AccuTrak fluid (blue stuff)--is there a similar "best" tc fluid for our Powerstrokes? And is it ok to use Mobile 1 in the diffs?