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Author
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Topic: Filling a 9"
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mvierow
Gearhead Posts: 152
From: Bay Area, Ca
Registered: Apr 2001
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posted 02-04-2002 01:00 PM
   
I have a 9" rear end in my ford with the early style housing (smooth back). It doesn't have a fill hole like I have seen on some of the later style housings. How does one go about filling these cases, and with how much fluid? Recommendations on oil types/brands/weights would be helpful as well. The casing is bolted into the car at the moment. Regards,
Mike
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steve'66
Gearhead Posts: 5598
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 02-04-2002 01:19 PM
Mike,Does it have a fill hole in the center section (pumpkin, hogs head)? If not then you'll have to pull an axle to fill it. The proper fill level is the bottom of the axle tubes. Next time you have the center section out drill and tap it for a fill plug.  Does it have trac-lock? If not just use 90 wt gear oil, 80-95 multi viscosity. Add friction modifier if it's a T-L. 
SteveW
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SteveLaRiviere
Administrator Posts: 30756
From: Saco, Maine
Registered: May 99
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posted 02-04-2002 01:23 PM
The older rears had a fill plug on the housing. The later Ford rears had the fill plugs on the third member assembly. You can't combine a early housing with a later third member assembly.They take two quarts of 85/90 weight. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
MCA Member # 47773
Mechanic's creedo: If it jams, force it. If it breaks, it needed replacing anyway.
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steve'66
Gearhead Posts: 5598
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 02-04-2002 01:31 PM
quote:
Originally posted by SteveLaRiviere:
They take two quarts of 85/90 weight.
I think it's 5 pints Steve. 
picky picky me,
SteveW
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Dave_C
Gearhead Posts: 660
From: Gadsden, Al
Registered: Aug 99
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posted 02-04-2002 02:10 PM
quote:
Originally posted by steve'66:
Mike,
Does it have a fill hole in the center section (pumpkin, hogs head)? If not then you'll have to pull an axle to fill it.
SteveW
You can also remove the vent from the drivers side tube. Some rears have a vent and a seperate bolt for the bracket to hold the brake lines, others have a combo vent/brake line holder. Put a length of rubber hose on the bottle of lube and squeeze it in. Takes a little while, but is easier than pulling an axle. Later, David Cole
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mvierow
Gearhead Posts: 152
From: Bay Area, Ca
Registered: Apr 2001
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posted 02-04-2002 02:40 PM
Thanks for the comments guys. I checked the housing but I didn't check the center section for a fill hole. The entire thing is in peices at the moment so filling through an axle tube is not a problem. I'll make another effort and see where I get. Thanks!Mike
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RonnieT
Gearhead Posts: 469
From: Port Allen, La. 70767
Registered: Jun 99
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posted 02-04-2002 09:58 PM
You realy need the fill hole in one of the 2 peices to ensure you have the proper oil level. If you don't add enough oil you will take a chance of ruining the bearings and gearset from lack of lube. Too much oil and the rearend will run hot and burn the gearlube, then you will ruin the bearings and gearset.------------------
Ronnie
69 mach1 351W-4V
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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