amount of quarts to fill a 9 3/8 posi

Discussion in 'Got gears?' started by fatboybuick, May 30, 2010.

  1. fatboybuick

    fatboybuick Well-Known Member

    Hello I had wrote in about this before and I was told 2 should be fine, I bought 2 and filled it's still not full. I am suppose to fill it until it dribbles out correct ?
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    My sources say 5.4 pints. more than 1 quart, but less than 2. Fill it till it dribbles out.
     
  3. fatboybuick

    fatboybuick Well-Known Member

    Yeah larry that's what I thought I read the last time I had posted, and you replied, but when I went to fill it today I put 2 quarts in and it was fairly short of being full until it dribbled out. It looks like it will take another half a quart maybe. Basically I should just fill it until it's full enough to dribble out some correct? I don't want to run this thing too dry. Also I did add the posi additive already. Thanks for your help.
     
  4. flynbuick

    flynbuick Guest

    For a 1970 9 3/8 rear I read the 70 Chassis Manual to specify 4 1/4 pints.:Do No:
     
  5. DaWildcat

    DaWildcat Platinum Level Contributor

    It will also depend on how you raise the car. Raise it significantly in the fill side versus the other and of course it's going to take more lube. Front to rear differences will affect this as well.

    Devon
     
  6. fatboybuick

    fatboybuick Well-Known Member

    The rearend is out of the car, and i have it up right where the part that holds the u-joint is pointed towards the ground. Could this be my problem? I thought I was suppose to fill it and then put the cover back on. Or was I supposed to put the cover on and it's another location that I should be filling from. I seen another part on the rear end that has what looks to be a little rubber or plastic cover on it but I couldn't remove it.
     
  7. DaWildcat

    DaWildcat Platinum Level Contributor

    You have overfilled it.

    The rear end needs to be sitting level exactly as it would in the car, with the cover on.

    On one side of the housing is a pipe plug, usually you can use a 3/8" square drive ratchet to remove it. Fill using this opening, stop when some fluid begins to drip out. Reinstall the plug and you're done.

    Don't mess with the plastic fitting on the axle tube...it's simply a breather.

    Devon
     
  8. fatboybuick

    fatboybuick Well-Known Member

    Ok thanks, I will drain a bit and then do it the correct way. Thanks for all the help. gents:beer
     
  9. fatboybuick

    fatboybuick Well-Known Member

    Just to make sure, should I drain all of the fluid that I put into the pumpkin, or just take some out and then refill from the hole?
     
  10. monzaz

    monzaz Jim

    Just put 2 in and fill the rest when you get it in the car to top off. 2 quart for sure then a little IF you have a posi (limited slip diff) then make sure you get that 6-8 oz. of additive in before complete fill. Good luck, Jim
     
  11. fatboybuick

    fatboybuick Well-Known Member

    Ok gentlemen for the lack of sounding like a dunce :confused: I havn't found anywhere on the rearend where there's a plug that would accept a ratchet and socket to remove so i could properly fill this thing. All I found was the plastic plug and from my understanding (and previous post) that this was just a breather. Is there anyway for someone to state exactly where this thing sits on the rear end, to help the slow new guy!
     
  12. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    It will be towards the middle of the pumpkin, on the u joint side of the pumpkin. This is a picture of a 1970 8.2 10 bolt. The fill plug is in the middle of the picture, next to the no hop bar.
     

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  13. DaWildcat

    DaWildcat Platinum Level Contributor

    If your fill plug looks like the one in Larry's pic, you can remove it with an adjustable crescent wrench.

    Devon
     
  14. fatboybuick

    fatboybuick Well-Known Member

    great guys, I don't know what I would do without this site!!!!!
     
  15. fatboybuick

    fatboybuick Well-Known Member

    Hello can any one tell me if it was any rear ends that didn't have that bolt there to fill it, was there any alternative methods, because I'm not seeing the bolt?:Do No:
     
  16. DaWildcat

    DaWildcat Platinum Level Contributor

    Can you post some pics so we can help you figure it out?

    Devon
     
  17. fatboybuick

    fatboybuick Well-Known Member

    Will do , try to post them tomorrow. thanks
     
  18. monzaz

    monzaz Jim

    You might have to scrape the rear housing it could be a recessed plug with a 3/8 drive square recess pipe thread plug. Trust us it is there. :) KEEP scaping if the rear is full of OLD oil or debris. Jim
     
  19. fatboybuick

    fatboybuick Well-Known Member

    Ok everyone, I finally found it wow it was a ton of gunk on there, and it was recessed like you guys said. Now these are my new questions. The rear end is filled with the cover and gasket on, now should I take the cover back off and drain everything, and then refill it correctly or can I just drain it from this plug and refill accordingly? My other question is my uncle has poured a quart of gear oil in the location where the plastic breather was, is this harmful or how should I approach this? At the rate I'm going it's gonna be ruined before I use the darn thing. Thank guys in advance :pray:
     
  20. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member


    I think the easiest thing would be to remove the cover. You may be able to reuse the gasket if you put it on dry. Then just refill it. It should take 1 and 1/4 quarts before it dribbles out.
     

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