Just did a rear end replacement on a '66,can any one tell the correct weightofdifferential oil on this model?? Please help a new member get this 'ol bird flying again!! Thanx,bob
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Correct differential oil??
Bob, there are several posts regarding this I found during a Search on "differential oil". Several were by Alexander. However, they pertained to Squarebirds. As I recall, he used 80/90W oil in his differential. I do not know if it is different for a Flairbird though. If you have a shop manual, you should be able to check what is required under Lubricants. You might do some searching under 1966 differential oil also. I did not search with that criteria.
Ray Clark - Squarebirds Administrator
The Terminator..... VTCI #11178 ITC #6000 Yellow Mustang Registry (YMR) #12188
Contact me via Private Message for my email address, or Call (Cell) 210-875-1411
https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
Faye's Ovarian Cancer Memorial Website.
https://faye.rayclark.info/index.html -
Bob, there are several posts regarding this I found during a Search on "differential oil". Several were by Alexander. However, they pertained to Squarebirds. As I recall, he used 80/90W oil in his differential. I do not know if it is different for a Flairbird though. If you have a shop manual, you should be able to check what is required under Lubricants. You might do some searching under 1966 differential oil also. I did not search with that criteria.Comment
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Correct differential oil??
Thanks, Bryan! I was hoping a Flairbird owner would come a long and tell us what they using in their Flairbirds. I figured it was the same thing that us Squarebird users do, but was not sure. Here is a thread about this. Alexander talks about this a bit and also which oil to use. Red Lion and Lucas brands are mentioned also. Thanks for the input, Bryan?
Ray Clark - Squarebirds Administrator
The Terminator..... VTCI #11178 ITC #6000 Yellow Mustang Registry (YMR) #12188
Contact me via Private Message for my email address, or Call (Cell) 210-875-1411
https://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm
Faye's Ovarian Cancer Memorial Website.
https://faye.rayclark.info/index.htmlComment
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Thanks, Bryan! I was hoping a Flairbird owner would come a long and tell us what they using in their Flairbirds. I figured it was the same thing that us Squarebird users do, but was not sure. Here is a thread about this. Alexander talks about this a bit and also which oil to use. Red Lion and Lucas brands are mentioned also. Thanks for the input, Bryan?
http://www.squarebirds.org/vbulletin...t=differential
The oil is actually a 75/90 http://mobil.pl/USA-English/Lubes/PD..._LS_75W-90.asp
Red Line Oil I have stayed away from because friends of mine that build and run their motors hard in racing tell me to stay away from it.....Comment
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Yeah, that's common with most limited slips now, Tom.
My Mustang 8.8 needs it to smooth out the clutches. 90W is the diff (dope) of choice, with limited slip additive to be changed ~ every 50k miles.
This little bottle goes for US$4.50. - DaveMember, Sons of the American Revolution
CLICK HERE to see my custom hydraulic roller 390 FE build.
"We've got to pause and ask ourselves: How much clean air do we need?"
--Lee Iacocca
From: Royal Oak, MichiganComment
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Re: Rear end oil
Thanx,Ray,all my shop man. gave was "Rotunda "and the FoMoCo number back then.I do think its the lighter weight oil,tho.bobComment
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Got any idea why rear ends need such heavy oil?
Depending on the load, they get hot. Sometimes, real hot. (Especially if you pull a trailer.) Next time you go on a long trip reach under and feel the housing. That 90W gear lube quickly turns into 70W (or thinner). With all those bearings and gears transferring hundreds of HP, heavy gear lube is needed.
I commend all you guys who change your rear-end lube. If you get a chance, look at the oil when it comes out... you can see little flecks of metal floating around like glitter.
Most cars go to the bone yard with their original gear lube.Member, Sons of the American Revolution
CLICK HERE to see my custom hydraulic roller 390 FE build.
"We've got to pause and ask ourselves: How much clean air do we need?"
--Lee Iacocca
From: Royal Oak, MichiganComment
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