I am changing gea oil in my 3.55 non limited slip rear end (2000 F150 4X4). I am using 75W 140 royal purple. Do I need to add a friction modifier?

Thanks,

Brian

 

Nope. Open rear axles have no clutches or friction materials that require additives.

 

What if you DO have LS? How much friction modifier is required? I too, plan on using 75w140 ... any recommendations on friction modifiers?

 

One bottle of Ford friction modifier (part # XL-3), about 6 ounces IIRC, will do. I've always used the Ford stuff, but I guess friction modifier is friction modifier.

 

OK, how about adding friction modifier if you do have a non limited slip? Would it hurt at all - besides just wasting money?

~ Brian

 

No, only thing it'd hurt is your wallet and nose, it's like $7 a bottle, and it stinks to high hell.

 

THAT is an understatement. I had to trash my yard clothes I was wearing when I changed my rear diff lube. I never got any on me, but I guess the odor permeated my clothes. I did get some on my watch and have yet to get the smell out. So.....I would suggest you wear clothes you ar willing to part with when doing this.

 

One of many tricks guys would play on the new guys in the shop would be to walk by their toolboxes or garbage cans and drizzle a little friction modifier in the can or under their toolboxes. One particularly obnoxious service advisor got a finger-ful of friction modifier in both his nostrils. Madder than a wet hornet, he was.

 

I just did the front and rear of my F150. I used 1 bottle of Ford friction modifier, 4oz. And I filled it with 75-140 Amsoil synthetic. Rear only. What a mess. Taking off the cover to drain and clean the diff wasn't the problem. Trying to use a pump to pump in the almost 3 quarts made a mess. There must be a better way. Oil leaks from the pump and the hose falls out of the diff and I knock the bottle over and you have to pour what remains in one bottle to another. It really sucked. Then I pretty much duplicated the same mess on the front diff.

And while I'm at it. Why would the Ford engineers put the oil filter in the front bumper laying sideways? Is it to **** off the home mechanic? I've never seen the dealers do it but do they tip the truck over on the driverside door so the oil doesn't come out of the filter when they unscrew it?

 

It's easier to fill the rear axle through the ABS sensor opening. Pluck the ABS sensor out (one 10mm bolt) and use the nozzle tips that normally come with a bottle of rear axle oil.

 

Again, this man with his suggestion saved my butt on this. The Amsoil containers do not have the nozzle tips, so I bought a small funnel and removed both the sensor and the plug. I just filled it up till it started to come out of the fill hole. I let it drain off till no more came out and buttoned it up.

Quintin, good call on the ABS sensor!

 

rear end gear oil is nasty smelling when you change it anyway, maybe thats why they call it "rear end" :o

 

Go buy a suction gun at an auto parts store. It looks like a grease gun except it doesn't have a handle on the side. Mine cost $13 at Napa and holds about a pint. It has about a foot long hose. I had no problem refilling the rear diff this way. In fact I also used the pump to suck out ALL of the fluid out of the rear end. That way I didin't have to screw with taking off the cover.

 

how do you remove the ABS sensor? I think I have found it but it does not look like there is a 10mm bolt holding it in place.
Is it located at the top near the front of the pumpkin?
Thanks

 

If you look over the "pumpkin" from the cover side, you will see the sensor at the top. The bolt is on the same side as the cover. Just remove the bolts and pull the sensor out. Do not forget to remove the side fill plug, so you do not over fill.