Chevy & GMC Vans

going to drain and fill the front diff, transfer case, trans and rear diff.

what do I need to know?

after some reading here's what i've come up with so far of what I'll need

75w90 for the diffs, atf III or IV for the transfer case and trans a trans filter kit and some gasket maker

do i need any gaskets for the transfer case or diffs or is gasket maker sufficient?

also, can anyone provide the torque specs on each part mentioned.

thanks for the input

oh, and does anyone know if atf dexIII has a shelf life? I have about 5L of fully synthetic left over from when I had my dakota (about 6yrs ago)

thanks again

hmm.. so.. did i post in a rarely viewed section? lol

or.. do i smell? :-k

lol sorry i did look at this when you first posted it and completely forgot about it

no shelf life to worry about as far as i know i used a felpro gasket on my rear diff no leaks yet. your not going to take apart the front diff or transfer case so you don't need any sealers they both have drain plugs with the nylon(?) washer. Torque specs i can get tonight when i get home, don't keep the service manual in the truck anymore lol

I didn't want to say it... but crash...

torque spec
front:
drain plug: 19 lb ft
fill plug: 19 lb ft
transfer case borg warner 4472:
drain and fill plugs 18 lb ft
rear:
cover bolts: 20 lb ft
fill plug: 24 lb ft

that should be all the ones you need

The tranny is 10 - 12 lb-ft I believe.

good eye lifted

see crash i wasn't avoiding you i'm just forgetful lol
the manual says 96 lb in for transmission pan bolts, less then i thought it would be.....

a manual is a good investment

timelessbeing wrote:I didn't want to say it... but crash...

I knew it ...

thanks for all the info guys.

going to change them all and keep the awd through the winter, see how fun it is. hate to say it but I may end up in the market for something new (used) come spring.

there's a terrible annoying droning that comes and goes when doing above 100km/hr (~60mph) on the highway. I'm assuming it's the transfer case or the front drive shaft or front axles. whatever it is.. it concerns me. not looking at putting any money into this van other than maintenance.

also got a whiff of coolant and slight fogging of the wind shield the other night when it was cold and raining out. we all know what that means.... something that is a lot of work from what i've read and something i don't want to get into. it's the one and only time it's happened over the last few months i've owned this 97 while running the heater

am I right with the 75W90 or should it be 75W140 for the front and rear diffs ? orrrr.. would even 80W90 be acceptable ?

thanks... might actually get to it this weekend bringing everything home from work anyway...

I think(honestly not sure) 80w90 was listed in the FSM i'm using 75w90

thank you, sir