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Post Info TOPIC: 12 bolt & M20 oil ?
65 SD L79


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12 bolt & M20 oil ?
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need to know what is the best lube to put in my rebuilt M20 and rebuilt 12 bolt posi. must be some oils out there that don't need additives 



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dcneric


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80/90 weight. I believe is what is specified. For the 12 bolt posi I put 80/90 in with delco friction modifier.

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Eric - Regina, SK

The Projects:

1935 Chev 3 Window Std Coupe

1957 Chev 2dr 

1967 Mustang Convertible

1969 Firebird 350HO Convertible

1969 Camaro X11-V8

1969 2+2 was a 396

1969 2+2 427

1980 Harley FXWG

1982 Chevy Silverado

1986 CJ7 Jeep

 
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beaucarlo


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for the m20 i recommend Delco GL 4 gear oil (special order at any GM dealer)......anything else eats up the brass in your trans.....the 12 bolt 80w90 Valvoline (works great in my ride)

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bob lewis
4SPEED427


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If it's a posi, the GM specific posi oil (sorry I can't get you tell part number at the moment ) and no additive needed if you use that. For the Muncie 80/90 works great except in January!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
cdnpont


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For the new 12 bolt, any popular brand name 80/90, but non synthetic only.

And the wee bottle of the GM friction modifier.

M51765280.jpg

Or the All-in-one GM stuff Carl suggests. (never knew there was such a product)



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65 Laurentian post, 67 Grande Parisienne 4 door HT. 
 
65 SD L79


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Carl Stevenson wrote:

If it's a posi, the GM specific posi oil (sorry I can't get you tell part number at the moment ) and no additive needed if you use that. For the Muncie 80/90 works great except in January!

 Have not found the all in one GM fluid only the additive Mark posted



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seventy2plus2


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I haven't seen the litre cans of the GM posi oil in many years. I've only seen the Limited Slip additive.

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70 2+2 convertible
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70 Parisienne hardtop

 

 
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4SPEED427


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I'm back at work after a couple of weeks off and found the number. 89021672 is specifically for posi before the synthetic days. However, it's discontinued. About 25 dealers in the country still have some stock. I have a note in my book that I wrote, Penzoil 550042083 is the same oil apparently.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
bjburnout


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Checked with my GM dealer in Goderich and they still the have AC Delco

Limited Slip Differential Additive in 114ml Canadian part no. 992694.

Have used this since the 60's so on my way up to clean them out........smile



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......big block, 4 speed, bench seat, it doesn't get much better

 happy motoring :burnout
4SPEED427


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As far as I've seen, the 992694 additive is no problem for supply, but the 89021672 is discontinued. A few dealers still show some of it though.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
65 SD L79


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IMG_0171.JPG

I IMG_0170.JPG



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4SPEED427


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That's the stuff, yup.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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65 SD L79


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Ford recommends this stuff

IMG_0172.JPG



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4SPEED427


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I've heard that mixed with sawdust and bananas will take away some of the howl in the Ford diffs.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
norontcan


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Just sitting here waiting for a rebuttal.

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4SPEED427


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Fordboy's got nothin'.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
65 SD L79


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Carl Stevenson wrote:

Fordboy's got nothin'.

 Did you Banned him?confuse



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4SPEED427


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Sadly I can't, or it would have happened long ago...

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
ARCADIAN


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Fords likes true Maple Syrup, fresh right now!

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