Capacity Puzzle
- Thread starter TStiles
- Start date
JSeery
Member Emeritus
That is strange, I think it would be very difficult to measure the fluid going in that accurately. I realize you can use pumps and measure it, but still! If that was the case think I would drill a new fill hole at the proper level. I re-drilled the fill hole on my quick-change side bell to make it easier to fill, fairly easy to do.
Edit: Just reviewed 5 Jeep sites online and they all say to fill to the bottom of the fill hole on a Dana 44. Doesn't prove anything, but if you are correct there must be a lot of bad information floating around out there.
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JSeery
Member Emeritus
OK, from the
Spicer
SERVICE MANUAL
Jeep Grand Cherokee WJ 44-4
X5001-CVSP
August 2002page 34
NOTE:
If the correct amount has been used, oil
should be at the bottom of the fill hole.
NOTE:
The type and amount of lubricant required
depends upon the type of the axle. See
specifications below.
Lube Specs
Standard differential case:
Use 80W90 thermal
stable lube. For a standard differential, use 76
ounces of lubricant for the best protection.
Trac-Lok differential:
Use 80W90 thermal stable
lube. For this axle, use 72 ounces of lubricant plus
four ounces of friction modifier. This is Dana part
number 43161. The total amount of lubricant used
should equal 76 ounces.
Hydra-Lok differential:
Use a synthetic lubricant.
Again use 72 ounces of lube, plus four ounces of
friction modifier, which is Spicer part number
43161.If they don't have it correct I don't know who would.
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V8COOPMAN
Well-known member
Mr. Seery presents a pretty reasonable argument, especially with regard to the vent. DD
Mart
Well-known member
If you didn't have the internet, like the vast majority of people who serviced these cars and trucks for the last 50, 60 70 years, (and more) you would fill it until it stopped running out of the fill hole and you'd pat yourself on the back for a job well done.
I think you are right, you may be over thinking or worrying too much. It isn't a Jeep, it's a ford pickup. Fill to the plug, or near to it and carry on with the next job.
The factory would put the fill hole in the right place. It would be just too difficult to issue instructions to dealers to use some other method of filling. Since new, if and when it was serviced it would have been filled using the plug as a guide.
Just my opinion.
Mart.
I think you are right, you may be over thinking or worrying too much. It isn't a Jeep, it's a ford pickup. Fill to the plug, or near to it and carry on with the next job.
The factory would put the fill hole in the right place. It would be just too difficult to issue instructions to dealers to use some other method of filling. Since new, if and when it was serviced it would have been filled using the plug as a guide.
Just my opinion.
Mart.
Bang on the money there Mart, bottom of the hole, job done.
Intersting though the breather comment earlier. The 44's And 41's I've mussed with had no breather in the obvious way. These were all out of Merc's rather than pickups. The only breathing I could see is on the back of the left hand axle tube, were the brake line junction is bolted on the back. This area is often oilyer than the rest of the rear end, so guess it breathes there. But like I say, not obviously a breather, it's a regular bolt holding the brass block junction on the axle tube.
Seems to work ok.
Anybody know if this is the breathing point for sure?
Martin.
Intersting though the breather comment earlier. The 44's And 41's I've mussed with had no breather in the obvious way. These were all out of Merc's rather than pickups. The only breathing I could see is on the back of the left hand axle tube, were the brake line junction is bolted on the back. This area is often oilyer than the rest of the rear end, so guess it breathes there. But like I say, not obviously a breather, it's a regular bolt holding the brass block junction on the axle tube.
Seems to work ok.
Anybody know if this is the breathing point for sure?
Martin.
Mart
Well-known member
Hi Martin, I have seen those type breathers, where the brake union bolts on. I THINK the bolt is a special item, with a hole up the middle and a loosely fitting metal cap that goes over the end. If one were not "in the know" and assembling and axle up from parts, if a normal bolt were used by mistake, the axle would not be able to breathe.
I seem to remember one with a metal cap like that on a 9" axle.
Mart.
I seem to remember one with a metal cap like that on a 9" axle.
Mart.
My stock 4.27:1 F1 49 diff has this.
I know the breather bolts you speak of, my Cortina has one on the gearbox (transmission) and back axle, also a flater topped one on the trans that was in my truck. However the ones on the 44 and 41 I have here, just have plain bolts. These bolts are parallel to the floor on the 41 and 44, would fitting one of the breather bolts in this location not leak?
Martin.
Martin.