Hey guys i was wondering how to change my diff fluids also my transfer case and transmission i wanna use Royal purple in it but i have no idea how to change it...dont wanna pay someone to do it either.:rpsrocks:

does your differential have a drain plug? if it does thats where you drain it and a fill plug will be above that. but mine doesn't have one so you can suck it out through the fill plug or take off the cover and drain it that way.

the transmission has a drain plug at the lowest point on the side if i remember correctly. and on that same side is the fill plug. same goes for your transfer case you want to fill them till they are as high as the fill plug

Well, you have a drain pan ready.
You loosen the bolts on the rear diff cover.
Slowly take the cover off, and fluid will drain out.
It will smell, just to warn you.
On the driver's side front of the "pumpkin", there is a plug that requires a 3/8 drive wratchet.
Use a 3/8 size extension and take the plug out (Leftie loosie rightie tightie).
I'm assuming you have a limited slip? I BELIEVE you need a friction multiplier, along with gear oil to refill.
You CAN buy a differential cover gasket, but I'd opt for some RTV that you use as a gasket. Use the RTV on the diff cover, apply it everywhere around the edge off the diff cover, and even in the bolt holes in the diff cover. Bolt the diff cover back on.
Then, refill the "pumpkin" using the gear oil and friction multiplier through that hole on the front driver's side of the rear end.
Then use the 3/8, put the plug back in, and you should be good to go.

I don't think I'm missing anything..

For all drivetrain fluids it is recommended to drive for about 10-20 minutes at 50 mph or so to warm the fluids up. This will help them flow better when draining and get more particles out with it.

If you don't have some kind of fluid pump then go get one, you'll need it for the transfer case and differentials. Only about $10 at Advance Auto or Autozone.

Transfer case is a simple one. Pull off the balancer on the rear of it (if you have one) and you should be able to see the drain and fill plugs. Pull the fill plug out first! You don't want to drain the fluid only to find the fill plug has seized up. Once it's finished dripping reinstall the drain plug and fill it up using the pump with automatic transmission fluid, look in the manual for the exact type, Mercon Type F I think but not positive.

Rear diff has already been described. Take the diff cover off. Clean it out along with as much oil as you can from inside the axle. Reinstall diff cover using plenty of RTV around the edge and tighten the bolts in an alternating pattern. Pull the fill plug out from near where the driveshaft meets the axle housing and use a tube of limited slip friction modifier (if you have limited slip) then fill it up with gear oil (80W-90), again using the hand pump. Expect this part to take a while, the rear axle holds a lot of fluid.

I've got the TTB front diff and have never worked on an SLA front diff so I'll leave that explanation to someone else.

As far as an automatic transmission goes. You can drop the pan and get about 1/3 of the transmission's fluid out or take it to a shop and let them use their special tools to get all the fluid out and flush it at the same time. TRS has an article for draining everything if you want to get that deep into it.
http://www.therangerstation.com/tech_library/TransmissionFluid.html

sorry to butt in but, i have 136k on my tranny should i not change the fluid since its been in so long? maybe i missed it but what oil goes in the transfer case.

+1 ^(kelly) for rockn the SH paint

My experience is that if the tranny is working fine with ancient oil in it, you are much better off leaving it alone until it dies, than changing the oil now. If you change it, you risk disturbing something that will kill the tranny sooner...

you should change the atf in that trans. but if you buy into the whole older is better thing than leave it the way it is. if it were up to me I would change it tho.

I changed my trans at about 50k, and my tcase at about 60k. and BOY OH BOY...were they ugly!! Brown and ugly as all hell. Same goes with my front diff when i did the superlift. Was full of water...green and milky looking. I have a manual if that makes any difference with you being an auto.

Front diff....pull the fill plug out. And pump the old junk out, and pump new stuff in. That's how ford does it. Or you can do it 'right' and actually drop the front axle out of the truck, and pull the cover off and do it right. There's NO WAY to pull the cover with the axle in the truck.
http://i243.photobucket.com/albums/ff159/Fx4wannabe01/05-10-08%20-%20Superlift%20Install/P5100155.jpg
http://i243.photobucket.com/albums/ff159/Fx4wannabe01/05-10-08%20-%20Superlift%20Install/P5100153.jpg


Changing the tcase fluid:



You need to pull that rubber counterweight thingy off using a 13mm socket. Once that's off...BAM! there's the drain plug. Up top, mid body toward the right, is the fill hole. It uses a 3/8" rachet to take the plugs out. I used a 3/8 rachet with a 3" extension. Mines painted pink. Be prepared to see some ugly arse brown stuff to drain out of it. I believe the book calls for ATF on our tcases. I run Royal Purple Synthetic in my crankcase, trans, tcase, rear end, powersteering, etc. Hope it helps.

Shane

What you need to take off:
http://img361.imageshack.us/img361/8140/p9100001mu8.jpg

BAM! The shiny one at the bottom is a drain....the pink painted one is the fill.
http://img473.imageshack.us/img473/7362/p9100002tl8.jpg

I just did that last night, without seeing this thread, had to lay there and SIPHON the t-case, I've got to say, I'm hatin' ya right now fx4wannabe! Dang...

Thanks for showing the picture...next time...

JR

lol...umm...sorry? I just noticed someone bumped a week old thread...so....yea....i kinda helped...right? lol.

For all drivetrain fluids it is recommended to drive for about 10-20 minutes at 50 mph or so to warm the fluids up. This will help them flow better when draining and get more particles out with it.

If you don't have some kind of fluid pump then go get one, you'll need it for the transfer case and differentials. Only about $10 at Advance Auto or Autozone.

Transfer case is a simple one. Pull off the balancer on the rear of it (if you have one) and you should be able to see the drain and fill plugs. Pull the fill plug out first! You don't want to drain the fluid only to find the fill plug has seized up. Once it's finished dripping reinstall the drain plug and fill it up using the pump with automatic transmission fluid, look in the manual for the exact type, Mercon Type F I think but not positive.

Rear diff has already been described. Take the diff cover off. Clean it out along with as much oil as you can from inside the axle. Reinstall diff cover using plenty of RTV around the edge and tighten the bolts in an alternating pattern. Pull the fill plug out from near where the driveshaft meets the axle housing and use a tube of limited slip friction modifier (if you have limited slip) then fill it up with gear oil (80W-90), again using the hand pump. Expect this part to take a while, the rear axle holds a lot of fluid.

I've got the TTB front diff and have never worked on an SLA front diff so I'll leave that explanation to someone else.

As far as an automatic transmission goes. You can drop the pan and get about 1/3 of the transmission's fluid out or take it to a shop and let them use their special tools to get all the fluid out and flush it at the same time. TRS has an article for draining everything if you want to get that deep into it.
http://www.therangerstation.com/tech_library/TransmissionFluid.html

I just followed this guide for the ATF, works very well thanks for the link (search picked it up no problem). I have never done a tranny flush before but it wasnt too hard, the hard part is getting the gasket to sit because its just jammed in the bottom of the box crumpled up like a napkin LOL. If you push the bolts through the pan and through the gasket it helps hold it so it doesnt spring out of shape when your trying to lift it up and get everything in place

Thanks again

Transfer case is a simple one. Pull off the balancer on the rear of it (if you have one) and you should be able to see the drain and fill plugs. Pull the fill plug out first! You don't want to drain the fluid only to find the fill plug has seized up. Once it's finished dripping reinstall the drain plug and fill it up using the pump with automatic transmission fluid, look in the manual for the exact type, Mercon Type F I think but not positive.

I just did this on my '98. Haynes says Mercon III...so that's what I used. 2k miles later it is still okay. :wiggle: