9" filler q

Leeroy · Post by **Leeroy** » October 27, 2011, 5:56 am

Really dumb question sorry....

Went to add some friction modifier today and the fill plug I have used in other 9" diff's before.... doesnt exist! I went looking on the passenger side (usa drivers side!) of the 3rd member and the flat area where I was expecting to find the small filler plug is there, but there is no plug!

On the back I have what I always thought was a drain plug, its way below the axle centreline, so I figured it had to be to drain. Is this the filler plug???

Sorry about the pic, best I could get this late.

R Pope · Post by **R Pope** » October 27, 2011, 6:52 am

Yep, that's the fill/level plug.

Uncle Skip · Post by **Uncle Skip** » October 27, 2011, 8:29 am

Yep. Thas it. Use your 1/2" drive ratchet and it will come right out. You fill the new grease to that level until it oozes out too.

Leeroy · Post by **Leeroy** » October 27, 2011, 8:16 pm

Thanks guys, filled this morning. No more noise!

Alan Mclennan · Post by **Alan Mclennan** » October 27, 2011, 8:29 pm

Leeroy wrote:Thanks guys, filled this morning. No more noise!

If that doesn't work, get Darren to send some banana skins down, real good friction modifiers!

557f1 · Post by **557f1** » October 27, 2011, 10:15 pm

At the moment it would be cheaper for Leith to buy a new diff than a kg of banana's Alan,

Alan Mclennan · Post by **Alan Mclennan** » October 27, 2011, 10:21 pm

557f1 wrote:At the moment it would be cheaper for Leith to buy a new diff than a kg of banana's Alan,

I knowIknow!

Leeroy · Post by **Leeroy** » October 27, 2011, 11:25 pm

Hahaha, knock it off you two!! The diff is purring now!

The banannas thing is a bit ridiculous, I was in Singapore last week, crap banannas were $1.30kg and 'premium' were $1.90kg!

We are getting ripped off and I heard some idiot on the radio say the bananna prices were driving inflation?!?!?!?

We pay these people to run the country????

557f1 · Post by **557f1** » October 28, 2011, 8:53 am

Yeah, I enjoyed paying $1.62 a litre for fuel tonight.Bastards!

MadMaxetc · Post by **MadMaxetc** » October 28, 2011, 9:54 am

So I have never seen that plug on a 9" What year did they put them on?

My 63, 67, 73, 75, 79 did not have it.

Hunter's 64 · Post by **Hunter's 64** » October 28, 2011, 10:09 am

my 64 has the plug ?

Danny

jamesdfo · Post by **jamesdfo** » October 28, 2011, 11:09 am

Depending on original application, year of production, etc, there were many variations on plug location.
Way back in 1983, I had a mercury Zephyr that was my DD, and I was also bracket racing:):) Well, the PO had swapped out the 7.5" diff for a 4 cyll 6.5" diff....and the power of the 302 was too much for it

Anyways, we went out cruising country roads and within 30 minutes had a 1957 ford 9" to use...but it was housing & axles only. So, my friend Steve lent me a 3:55 pumpkin to use....and once Steve had cannibalized the brackets off the 6.5" diff & welded them onto the 9", it was all bolted back in the car, brake backing plates from yet another diff installed, etc. FINALLY time to put some lube in the diff:)
Well, this is about when we discovered that neither the housing or the pumpkin had a fill plug in them!!
So, being smarter than the average bears, we simply waited until we were basically ready to drop it off the jackstands, and with one wheel back on the ground, and the opposite side still elevated, we removed one axle and proceeded to pour the lube into the end of the housing:):)

the end

*ryno* · Post by ***ryno*** » November 2, 2011, 8:23 am

the pic you posted IS the drain plug
you need to fill it more then that. a new or recently drained 9" 3rd memeber will hold about 2.5-3 quarts of fluid. there needs to be a fill soem where else, every one ive seen has a filler spot on the drivers side by the output pionion/yoke. same 1/2 drive plug. it may be too dirty for you to see, but id clean and look real good, before driving it too much.

Hawkrod · Post by **Hawkrod** » November 3, 2011, 7:34 am

Sorry *ryno*, you are mistaken, Ford 9" don't have a drain plug, that plug is the filler plug as already noted and is the same height as the plug that would be on the front IF it has one. In the early to mid 60's Ford quit putting fill plugs on the pumpkin on some models and then in 68 went back to it. It is not uncommon. Hawkrod

HiBoy63 · Post by **HiBoy63** » November 3, 2011, 9:49 am

No fill plug on my 65 F100 4wd 9 just a drain plug. With that being said. Anyone have a good way to completely drain and fill this type of axle short of pulling axle and jacking up one side. Ha Ha Good idea but to labor intensive for me.

jamesdfo · Post by **jamesdfo** » November 3, 2011, 10:50 am

Without pulling an axle, a suction gun might work (assuming you can poke the hose in through diff fill plug & actually hit the puddle:)......

If you have any plans of pulling the pumpkin, I would add a drain bung to the bottom of the housing. I have seen them listed under several names, such as tank flange, weld flange, etc
Available in various sizes, 1/2" NPT is large enough.....

http://www.mcmaster.com/#tank-flanges/=ervnhn

James

HiBoy63 wrote:No fill plug on my 65 F100 4wd 9 just a drain plug. With that being said. Anyone have a good way to completely drain and fill this type of axle short of pulling axle and jacking up one side. Ha Ha Good idea but to labor intensive for me.

Max · Post by **Max** » November 3, 2011, 5:24 pm

Cheapie Harbor Freight suction pumps work well to drain the diff's but I'd pull the pumpkin out and clean it up real good if you're going to drain it at all.

Hawkrod · Post by **Hawkrod** » November 4, 2011, 7:24 am

To drain a 9 inch you simply loosen one of teh bottom nuts until it is only on a couple of threads and then tap the nut/stud back into the case (it is a bunch easier if you remove the copper washer first). It takes quite a while to drain but that is the factory recomended proceedure. Hawkrod

unibody madness · Post by **unibody madness** » November 4, 2011, 8:30 am

Hawkrod wrote:To drain a 9 inch you simply loosen one of teh bottom nuts until it is only on a couple of threads and then tap the nut/stud back into the case (it is a bunch easier if you remove the copper washer first). It takes quite a while to drain but that is the factory recomended proceedure. Hawkrod

Hawkrod,
I did not know that was even possible... the things you can learn on this site constantly amaze me.
Would it be feasible to add some light weight oil, solvent or kerosene,spin the diff and drain to loosen things up a bit?

John

slick4x4 · Post by **slick4x4** » November 4, 2011, 8:47 am

'' Would it be feasible to add some light weight oil, solvent or kerosene,spin the diff and drain to loosen things up a bit? ''

when i bought my 61 , i drained the transmissinon / transfer case / front diff / rear diff
then i filled each of them with diesel fuel
drove it slowly appox 1/4 mile
then drained them again... stuff coming out was dirty
filled with new 90w
several thousand miles later no problems