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Richard
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I see the recommended oil is 40 weight motor oil. I used Hypoid.
what are you guys using
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Dobie
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OK, then what do you suggest we use in our Transmissions? Seems to me obsolete oil is just the ticket for obsolete gearboxes. Regarding the '57 S.A.E. 80 spec, perhaps some changes were made to the transmission for that model year and Ford decided by testing that the new spec was backwards compatible with the earlier transmissions.
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57RancheroJim
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I've been using GL4 80-90 for longer then I can remember in all my trans and have never had a trans problem.
Most people don't know that the light duty Ford 3speed was a BW design and licensed to Ford to build..
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KULTULZ
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I've been using GL4 80-90 for longer then I can remember in all my trans ...
There is your answer Dobie.
But not all GL-4 is refined/modified in the same manner. It is the owners (or shop) responsibility to ascertain what is correct for the application. There is no one-fit-all.
It is GL-5 or MT that you stay wary of.
Didn't mean to piss you off.
Lubricants advance in design just like anything else. I surely wouldn't go by a 1957 FORD LUBE CHART.
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Dobie
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GL-4 still has sulphur, albeit in a reduced amount. Based on the above statement by 57RancheroJim, it may be OK to use but I would like to see the synchros after long term use, and an oil analysis. Since I have what is likely a lifetime supply of GL-1 (the Traveller oil only comes in 2 gal. jugs) I'll keep using it. You didn't piss me off, I like a good kerfuffle. 
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KULTULZ
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The question was what is the correct fluid to use. What you personally use is your choice.
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57RancheroJim
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Dobie (11/19/2021)
GL-4 still has sulphur, albeit in a reduced amount. Based on the above statement by 57RancheroJim, it may be OK to use but I would like to see the synchros after long term use, and an oil analysis. Since I have what is likely a lifetime supply of GL-1 (the Traveller oil only comes in 2 gal. jugs) I'll keep using it. You didn't piss me off, I like a good kerfuffle. I've never had a synchro problem and I've never done an oil analysis and have never touched the trans except one I did a rear seal replacement. My light duty truck R10 trans has well over 200,000 miles now and my BW T85 R-11 that has been in several cars over the years has countless miles on it.. I'm not saying it's the only type to use, just my experience. Like everything else it's the owners choice what they want to use.
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KULTULZ
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Somewhere around 30 years ago a deactivated or buffered sulfur was developed that would react with
the phosphorous to create the protective/sacrificial layer in the conditions created in the gear boxes
(temperature and pressure) without being corrosive to the brass, copper, etc. This additive system is
used in most gear oils today.
Further In Text -
Summary
Just remember that GL-4 and GL-5 are gear oil ratings, not transmission oil ratings. Transmissions
have gears and synchronizers. These seemingly conflicting requirements must be met differently.
When someone tells you that their GL-5 covers GL-4, remember they are correct as far as EP protection,
but that is only half the answer. When they say their Sulfur/Phosphorous additive will not corrode the
yellow metals, they are also correct, but if there are enough to meet GL-5 protection, they will slowly
peel away your brass synchronizers.
FULLY EXPLAINED SOURCE - https://www.widman.biz/uploads/Transaxle_oil.pdf
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Dobie
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"Summary Just remember that GL-4 and GL-5 are gear oil ratings, not transmission oil ratings. Transmissions have gears and synchronizers. These seemingly conflicting requirements must be met differently. When someone tells you that their GL-5 covers GL-4, remember they are correct as far as EP protection, but that is only half the answer. When they say their Sulfur/Phosphorous additive will not corrode the
yellow metals, they are also correct, but if there are enough to meet GL-5 protection, they will slowly
peel away your brass synchronizers."I rest my case. 
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57RancheroJim
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Dobie
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It is innersting, as Ross Perot used to say. One glaring mistake in it; there are no brass parts in the OD itself, only the the synchros in the main box. $30 a gallon! OUCH!. You can get 2 gallons of the same stuff from Tractor Supply for about $20 with tax.
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KULTULZ
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When they say their Sulfur/Phosphorous additive will not corrode the
yellow metals, they are also correct, but if there are enough to meet GL-5 protection, they will slowly
peel away your brass synchronizers."
I rest my case.
Dobie, I realize that I am somewhat reading comprehension challenged but what is it exactly that you cipher in that text?
GL-1 is in no way comparable to GL-4. They are decades apart. That is why you only find it in equipment/agriculture supply stores.
BTW - Blocking rings will eventually wear to the point where they need replacement regardless of lubricant type.
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Dobie
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KULTULZ (11/21/2021)
When they say their Sulfur/Phosphorous additive will not corrode the
yellow metals, they are also correct, but if there are enough to meet GL-5 protection, they will slowly
peel away your brass synchronizers."
I rest my case.
Dobie, I realize that I am somewhat reading comprehension challenged but what is it exactly that you cipher in that text?
GL-1 is in no way comparable to GL-4. They are decades apart. That is why you only find it in equipment/agriculture supply stores.
BTW - Blocking rings will eventually wear to the point where they need replacement regardless of lubricant type.
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KULTULZ
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No, the statement states that both GL-4 and GL-5 contain modern formulations and unless a manufacturer's lube chart specifically calls for GL-5, GL-5 (or 6) cannot be used for transmission fill as the GL-5 concentration is much higher in GL-5 rather than GL-4.
GL-5 and GL-6 are meant for the DIF in most instances.
Just admit it, you are just too damn cheap to buy current TECH fluid ...
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Dobie
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GL-4 has sulphur in it (unless stated otherwise by the manufacturer), just not as much as GL-5. Therefore using GL-4 in our ancient trannies will still have a negative impact on the synchros, just not as fast as GL-5 will. And, yes, I admit to being cheap. My jug of GL-1 has been in the family for decades. 
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KULTULZ
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Yes, GL-4 has a sulfur blend. It is included as a necessity in late transmissions. You must watch a lot of SUPERMAN SERIALS on the NOSTALGIC TV CHANNEL. You are in a time warp. I think your family has been snortin' on that jug of mineral oil ... 
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Dobie
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KULTULZ (11/21/2021)
Yes, GL-4 has a sulfur blend. It is included as a necessity in late transmissions. You must watch a lot of SUPERMAN SERIALS on the NOSTALGIC TV CHANNEL. You are in a time warp. I think your family has been snortin' on that jug of mineral oil ... Again I rest my case. 😁 Sulphur is a necessity in LATE transmissions. It is NOT a necessity in our primitive boxes. No time warp, I just won't use something that I know is harmful. If a manufacturer comes up with a modern formulation that does no damage I will use it...when my jug of GL-1 is empty. 
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KULTULZ
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While you are resting your case - https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oilLet me bring out this one factoid listed - Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage Not all lubricant refiners offer the exact same product. It is for you to read and comprehend. API OIL CLASSIFICATION CHART - https://www.oilspecifications.org/api_gos.php
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Dobie
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I'll take it under advisement when I run out of GL-1, but at $18.60 I can buy 2 gallons of Traveller. Hmmm, lessee. $18.60/qt. or 2 gallons of GL-1 for the same price. 🤨
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KULTULZ
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I'll take it under advisement when I run out of GL-1, but at $18.60 I can buy 2 gallons of Traveller. Hmmm, lessee. $18.60/qt. or 2 gallons of GL-1 for the same price. 🤨
So let me get this right, you understand modern lubricants now but are unwilling to take car of that pretty MERC (which I assume has always been faithful) as you would rather spend your money on wine, women and song?
Interesting exercise ... Take it easy ...
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Dobie
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KULTULZ (11/22/2021)
I'll take it under advisement when I run out of GL-1, but at $18.60 I can buy 2 gallons of Traveller. Hmmm, lessee. $18.60/qt. or 2 gallons of GL-1 for the same price. 🤨
So let me get this right, you understand modern lubricants now but are unwilling to take car of that pretty MERC (which I assume has always been faithful) as you would rather spend your money on wine, women and song?
Interesting exercise ... Take it easy ...
I have always understood that some modern lubricants are better than the stuff available when our cars were new. Modern motor oil is light years ahead of the sludgy, mostly paraffin based oils of the day, even though we have to mind the ZDDP levels and/or add it ourselves.. Modern differential oils are preferable and completely safe for us. Most modern transmission oils are not safe for the brass parts in our transmissions and I won't use them. The engineer in me just won't let me do it.
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Richard
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Well, I never thought I would get such a bundle of information. For what I sift, sulfur is bad for brass synchros and tractor supplies carry the oil I need. Please let’s end this thread and move on
thanks all
Richard
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57RancheroJim
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Dobie (11/21/2021)
It is innersting, as Ross Perot used to say. One glaring mistake in it; there are no brass parts in the OD itself, only the the synchros in the main box. $30 a gallon! OUCH!. You can get 2 gallons of the same stuff from Tractor Supply for about $20 with tax. What about the tail shaft bushing and thats lubricated by the oil in the OD. I thought about purchasing that oil years ago but I'm to cheap to pay that price + $20 a gallon to ship.
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Dobie
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Yeah, I forgot about the tail shaft bushing. Not strictly part of the OD but there nonetheless.
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