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Joined: Sep 2010
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OP
Backyard Mechanic
Joined: Sep 2010
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I was working on the 48 last night - trying to get some little stuff fixed before it's time to get her back on the road. Last Summer I refilled the tranny a couple of times because it leaks gear lube a bit. It occured to me that I'd better check the diffential to make sure the tranny wasn't leaking gear lube into it through the torque tube. I held my breath and unscrewed the big plug. The level was right on the money, and, that made my day - big time.
Regards:
Oldengineer
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Joined: May 2002
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Always great to to feel sucsess!!!
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Joined: Feb 2011
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ChatMaster - 3,000
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ChatMaster - 3,000
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Geez, Thanks for the reminder...Guess I 'd better check mine, too...Last time I checked the "tranny" it was near dry...Now, I wonder where the fluid went... 
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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Them are the dark spots you see in the parking places at McDonalds
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Of course it was full. Upon checking to see if the differential (rear end) was full, has anyone ever needed to add oil to it. Nooo. Never. Here's why. You check the transmission top plug. Keep it filled to where a curved little finger will just touch the top level of oil. Read on. Owing to transmission oil traveling out its rear, on by the u-joint and thence down the torque tube (seeping by the seal there) and thus to the rear end, it (rear end) gets plenty of oil. The rear end is kept level and full without becoming too full, by excess oil leaking by the rear wheel seals. See?  You're welcome. Charlie 
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If much leaks past the rear axle seals you will soon know it because the rear brakes will start grabbing. 
Ed
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Joined: Sep 2010
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Backyard Mechanic
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OP
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Charlie:
Based on the amount that drips off the bottom of my tranny into my kitty litter pan, and, the fact that there's none leaking out of my rear brakes onto the backing plates, I'll continue to be happy.
Regards:
Oldengineer
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Joined: Mar 2012
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Backyard Mechanic
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Backyard Mechanic
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In the nine yrs that I've owned mine Iv'e never been able to get the plug loose in mine,even had a pipe-wrench and pushing on it with my foot and leg...but the car was only showing 52,000 miles on her when I got her,now she showing a whopping 57,000...I haven't heard any noises yet so guess i'm fine,but if I do then it will be too late,damage done....
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Joined: Sep 2010
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Backyard Mechanic
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OP
Backyard Mechanic
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48 Heavy:
Luckily, I scored a very large Crescent wrench years ago. Never thought I'd have a real use for it, until I eyeballed the big drain bolt on my 48's differential.
Regards:
Oldengineer
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Joined: Mar 2012
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Backyard Mechanic
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Backyard Mechanic
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Yea guess I need to get something longer for more leverage..
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Joined: Sep 2012
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Backyard Mechanic
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Backyard Mechanic
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My `40 was really stuck on too....had to square up the plug with a side grinder and dress it out with a file ....then barely broke it loose with ....again a LARGE cresent wrench ......,MM
David Martin-Hendersonville NC, Pine Island Fl....... 1940 Chevy SDSS,
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