Is this all I need to do the diffs, tranny, and t-case fluid changes?
1. Synthetic Blend 80w90 Gear Oil
2. Mobil 1 Synthetic ATF Mercon V
3. Ultra Black, gasket maker (rear diff cover)

 

man that sucks have to remove the diff cover. i had my buddy do my diffs and transfer case at a local oil shop and we just pulled the fill plugs and they have a pump to suck it out. so after some bsing and smoke breaks about 45 minutes later we had both diffs and transfer case done for free. and no new gaskets!

 

I could actually do that too. Just stick a pump in the filler hole of the rear diff and suck it out, don't know if that is wise or not, but I think i'll take the diff cover off anyway, just to get the experience.

 

I would rather take the diff cover off too, to make sure everything is good to go... you might take it off and see a bunch of metal in there or something....

Im not sure if thats all you need, might need more fluid than what you have... but i need to do mine ASAP..

 

Yeah, i'll surely take it off. But, do you know if those are the right fluids, though??

 

if its L/S you need friction modifier. if its a torsen, you need full synthetic 75w140

 

How do I know if its l/s or torsen. I'm going by the manual, and it just says hypoid 80w90.

 

Easiest way to find out...go powerbrake it and see if both rear tires lock up...lol j/k

 

jack up the rear end, spin one of the rear wheels.....if BOTH wheels spin in the same direction, then you have a limited slip.....if one spins in the opposite direction, you diff is an open diff.....

as far as the diff fluid, i would run 75w90 full synthetic in the rear......that way even if you have a limited slip, you don't have to get the friction modifier....it is already in the full synthetic stuff....

 

What would be the best way to find out??

 

Thanks a lot!! So full synthetic in the back, what about the front?

 

same as rear....same 75w90 full synthetic......i am running it in my front and rear.....

 

Thanks A LOT!! How about the rear diff, do you remove the cover to drain or just suck it out? How about a gasket what do you use?

 

remove the rear cover and drain it out that way.....then use the fill hole in the front of the diff to fill it back up.....the fluid only needs to come to that fill hole.........you can either go buy a gasket ($9 or so) or you can make one out of a tube of Form-a-Gasket or black silicone.....run a 1/4" bead of either around the center ring of the cover, going completely around all the bolt holes......the press it on and put the bolts back in....

 

Yeah, I was just wondering what you use. I'm not sure if to buy a make a gasket.

 

either way works.......if you dont feel comfortable in using the Form-A-Gasket, then i would buy one...

 

I may just but one, sounds easier. I just priced one for $6. But they asked if it was an 8.8 or a 7.56. I have no idea. Sorry for all the questions, but how would I find that out?

 

is your truck a 4.0 or a 3.0 engine? if it is the 4.0, then you have the 8.8, if it is the 3.0, then you could have either.....

look here to find out what axle you have:
https://www.ranger-forums.com/forum2...ad.php?t=37149

 

Mine is a 98 3.0. And you link said this:
"- 98: Open 8.8 w/ 4.56 ratio (not a ratio installed on Rangers) "
So i'm assuming an 8.8. Damn, you know your stuff, good to have people like you here on these forums.

 

i can guarantee you don't have an axle code of "98"......what does it say on your trucks door sticker under the "AXL"?

 

My mistake I read your link wrong. I didnt see axle code at the top, I was assuming the numbers on the side meant the year of the vehicle. I dont have any stickers on my door. They were removed before the truck got to me.

 

Ok I found the axle code:
- F6: Limited Slip 7.5 w/ 3.73 ratio

 

then look at the diff cover....there should be a tag on it like the one i just edited into the thread......it will say what axle you have......

if you don't have any tag, take a couple pictures of the rear, i can tell you what you have by the picture....

 

where did you get the F6 number from? did it come off the door sticker?

 

Well it was actually in the glove box, because it was taken off when the door was replaced. But yes, from the door tag.