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By Shaggy - 7 Years Ago
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Since i've got my transmission back togather and in i havent been able to get it to shift into OD, i'm about 40 miles in and dailying it. It assembled fine and seemed to shift smooth when apart and freewheels fine. No change with the overdrive cable engaged or disengaged. It was assembled with 80-90w brad penn gl4(i now read 40w is recommended by BW?) Now not overdrive shifting at speed(when letting off the gas) should be purely a mechanical issue right?
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By miker - 7 Years Ago
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No, the electrical, both the solenoid and governor have to be hooked up, and power to the circuit. The kick down switch has to be working or bypassed probably, too. They work with power,and drop out without it. Or don’t engage. Don’t know about the oil, but IIRC there’s a separate fill for the od section. Don’t run it dry.
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By 57RancheroJim - 7 Years Ago
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I agree, probably electrical, something not energizing the solenoid. Your gear oil will be fine, viscosity for motor oil and gear oil are measured differently ( don't ask me why ) 80-90 is about the same as 40W. I like many others have been using 80-90 for 30+ years in both my R-10 and R-11 ODs with no problem..
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By NoShortcuts - 7 Years Ago
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'50s Borg Warner transmissions (3 speed and 3 speed with overdrive) should be lubricated with mineral oil. John (Hoosier Hurricane) brought this info to us some years ago. I believe the reason for this was a friction factor of the mineral oil and B-W design intention for that friction factor. My recollection is that John related that it had to do with the synchronizer clutches and shifting quality.
This is another case of all oil (grease) not being the same.
Tractor Supply is one source for mineral oil in my area. 
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By Dobie - 7 Years Ago
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Above all do NOT use anything marked "hypoid" even if it's labeled for manual transmissions. The additives that make it hypoid will attack the brass synchronizers in older transmissions.
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By Gene Purser - 7 Years Ago
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The original poster said "No change with the overdrive cable engaged or disengaged". It sounds like the shift lever isn't in the slot in the shift rail. There are springs on each end of the shift rail. It all has to be located correctly.
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By miker - 7 Years Ago
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I didn’t read it that way, but you read it right. If it’s freewheeling with the cable in both positions you got it right.
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By Ted - 7 Years Ago
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It should only freewheel with the Overdrive lever pushed in. With the lever pulled out, the transmission should not freewheel.
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By Shaggy - 7 Years Ago
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Gene Purser (1/16/2018)
The original poster said "No change with the overdrive cable engaged or disengaged". It sounds like the shift lever isn't in the slot in the shift rail. There are springs on each end of the shift rail. It all has to be located correctly.
Good catch, no it keeps it out of freewheel when manually disengaged like it should.
I'm going to guess it has to do with they governor wire, i didnt get a reassuring click when plugged it in so it may not be connected. I'll crawl under it friday and see if that is it, for now, i'll backroad it to work.
On a similar note, i had a spare transmission with a block off plate on the solenoid hole, so would that work normally just without the passing kickdown?
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By Dobie - 7 Years Ago
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If the solenoid isn't installed it will never shift into OD. I hope I read your question correctly.
You can test the one in your car by bypassing all the control circuit except the relay. Wire a toggle to the relay, push the cable in and when you're at a suitable speed turn the switch on and let off the gas. It should shift. You can also test the solenoid in the car by attaching a long jumper to the SOL terminal on the relay and touching the other end to the hot battery post. It should click. If it clicks and the OD still won't engage the solenoid may not be installed correctly so that it can engage the OD drive plate. If you can pull the solenoid plunger out of the trans without 1st turning it 1/4 turn ccw it's not installed correctly..
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By petew - 7 Years Ago
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I use NAPA part # NHF65201 which is GL-1 80/90 mineral oil , they sell it by the gallon. I believe it is the proper spec oil for the overdrives.
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By charliemccraney - 7 Years Ago
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There are at least some modern hypoid GL-5 oils which are safe on yellow metals. Motul is one brand that manufactures such an oil. Check with your favorite oil brand before hunting down some special type of oil.
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By Lord Gaga - 7 Years Ago
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Check the relay (located on the firewall) points. I recently had to file and adj. the tension on mine when OD wouldn't engage. Easy to do, the hardest part is bending the tabs that hold the relay cover on.
I use Ford tractor transmission oil from TSC in my gearbox.
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By Florida_Phil - 7 Years Ago
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I recently used Wolf's Head SAE 80W-90 Hi-Performance HDX All Purpose Gear Lube to top off my 55 Thunderbird manual transmission and R10 O/D. Should I drain and refill it with mineral oil? If so I see there are many types of mineral oils available. What is recommended?
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By Dobie - 7 Years Ago
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Florida_Phil (1/18/2018)
I recently used Wolf's Head SAE 80W-90 Hi-Performance HDX All Purpose Gear Lube to top off my 55 Thunderbird manual transmission and R10 O/D. Should I drain and refill it with mineral oil? If so I see there are many types of mineral oils available. What is recommended?
"All purpose" means it can be used in diffs and manual transmissions but they mean modern manual transmissions since they don't contain brass parts. It can take quite a while for the damage to show up but if it were me I'd swap it out for mineral oil soon. My '53 shop manual calls for "mild E.P. gear oil SAE 80" That's an obsolete designation and I doubt you would find a straight 80 weight mineral oil anywhere these days. Tractor Supply carries "Ford Tractor Transmission Oil" in 85W90 I believe without going out to my freezing garage to look at my jug. That's the stuff you want, or the same from NAPA Auto Parts. I've been using it for years with no adverse effects.
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By Florida_Phil - 7 Years Ago
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Drove up to Tractor Supply and picked up a 2 gallon jug for $20. It's called "Traveller Ford Tractor All Mineral SAE90 Transmission Fluid". I'll change it as soon as my garage thaws out. Thanks!
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By Dobie - 7 Years Ago
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Great! You're welcome.
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