Transmission Lube:
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Laughing Gas
Joined: Nov 2001
Posts: 968
Likes: 71
From: Cherryville,N.C.
Transmission Lube:
Does anyone use synthetic oil in the transmission of their trucks?I was thinking about changing to this because the gear shifting is stiff when my truck is very cold.I understand that synthetic oil will help this problem.I just wonder if this is ok to change and will not cause a problem to change over.Any comments on this? My truck is stock 1952 F-1 with column shift.Thanks,Russ
Logistics Pro
Joined: Dec 2005
Posts: 4,644
Likes: 55
From: Moro Bay, AR
Russ, there should be no problem with running synthetic lube in your transmission. If you have any leaks, be prepared, they will be worse. If it had the old 90W mineral oil in it, it needs to be flushed well before adding the syn, they are not compatible.
Post Fiend
Joined: Jun 2001
Posts: 7,493
Likes: 7
From: Erie, pa
I just snagged this off one of the Transmission Technicians Certifications sites.
Tranny Fluid
FORD CAR
Transmission, Oil,
RAD, 80WT,
HEH, 80WT,
RUG O/D, 80WT,
SROD, 80WT,
RAP, 80WT,
T5, ATF,
T45, ATF,
RKE, ATF,
MTX, ATF,
MTX75, ATF,
M5TX, ATF,
FORD TRUCK
Transmission, Oil,
FM132, 75W90,
FM145, 75W90,
FM146, 75W90,
M5R1, ATF,
M5R2, ATF,
NP435, 50WT,
RTS, 80W90,
RUG, 80W90,
SROD, 80W90,
TREMEC, 80W90,
T18, 80W90,
T19, 80W90,
TK4, SYNTHETIC 75W90,
TK5, SYNTHETIC 75W90,
ZF S5-42, SYNTHETIC ATF,
ZF S5-47, SYNTHETIC ATF,
ZF S5-47M, SYNTHETIC ATF,
ZF S6-650, SYNTHETIC ATF,
FORD TRANSFER CASE
Transmission, Oil,
BW1345, ATF,
BW1350, ATF,
BW1354, ATF,
BW1356, ATF,
BW4404, ATF,
BW4405, ATF,
BW4406, ATF,
BW4407, ATF,
DANA28, ATF,
NP203, 30WT,
NP205, 80W90,
NP208, ATF,
NP271, ATF,
NP23, ATF,
Tranny Fluid
FORD CAR
Transmission, Oil,
RAD, 80WT,
HEH, 80WT,
RUG O/D, 80WT,
SROD, 80WT,
RAP, 80WT,
T5, ATF,
T45, ATF,
RKE, ATF,
MTX, ATF,
MTX75, ATF,
M5TX, ATF,
FORD TRUCK
Transmission, Oil,
FM132, 75W90,
FM145, 75W90,
FM146, 75W90,
M5R1, ATF,
M5R2, ATF,
NP435, 50WT,
RTS, 80W90,
RUG, 80W90,
SROD, 80W90,
TREMEC, 80W90,
T18, 80W90,
T19, 80W90,
TK4, SYNTHETIC 75W90,
TK5, SYNTHETIC 75W90,
ZF S5-42, SYNTHETIC ATF,
ZF S5-47, SYNTHETIC ATF,
ZF S5-47M, SYNTHETIC ATF,
ZF S6-650, SYNTHETIC ATF,
FORD TRANSFER CASE
Transmission, Oil,
BW1345, ATF,
BW1350, ATF,
BW1354, ATF,
BW1356, ATF,
BW4404, ATF,
BW4405, ATF,
BW4406, ATF,
BW4407, ATF,
DANA28, ATF,
NP203, 30WT,
NP205, 80W90,
NP208, ATF,
NP271, ATF,
NP23, ATF,
Thread Starter
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Laughing Gas
Joined: Nov 2001
Posts: 968
Likes: 71
From: Cherryville,N.C.
Thanks,Jeff.It does leak some around the shafts where the shifter arms are mounted.It shifts ok after it warms up a little.Second gear don't seem like it wants to go in smooth sometimes,I don't know that much about the transmission.Could I maybe have a synchronizer going bad? It is very quiet and no vibration or nothing like that and I don't want to change the lubricant and destroy it!
Elder User
Joined: Feb 2006
Posts: 833
Likes: 0
I was told that the Extreme pressure additives in synthetic and 80w90 wt oils with certain GL ratings will react with the brass or any "yellow metals" in these older transmissions so I just run the old straight 90.
More Turbo
Joined: Feb 2004
Posts: 704
Likes: 40
I put Mobil 1 90W in my 58 F-100 and it's been fine for 2 years now. If it is leaking any worse I can't tell. Shifting is better, noise is reduced, and it seems smoother at 50 mph. No detrimental effects so far.
Lou
Lou
Thread Starter
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Laughing Gas
Joined: Nov 2001
Posts: 968
Likes: 71
From: Cherryville,N.C.
Well I just wanted to give an update to my shifting problem on my old truck.I took the plug out and the oil looked like it might have been about 50 years old!It looked about like a melted chocolate shake.I had this truck 16 years the first time and never changed it, just added when needed.I bought the truck back 7 years later and this shifting problem just started.Anyway I will shut up and it shifts as smooth as silk with nice new 90W gear oil in her!Thanks for all the replies.
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Fleet Owner
Joined: Jul 2004
Posts: 27,291
Likes: 1,055
From: NM
Originally Posted by leonharu
Well I just wanted to give an update to my shifting problem on my old truck.I took the plug out and the oil looked like it might have been about 50 years old!It looked about like a melted chocolate shake.I had this truck 16 years the first time and never changed it, just added when needed.I bought the truck back 7 years later and this shifting problem just started.Anyway I will shut up and it shifts as smooth as silk with nice new 90W gear oil in her!Thanks for all the replies.
The thing about GL-4 and GL-5 oils eating up blocker rings and other brass is only a problem where the trans oil gets up to about 250 degrees and above. This came up on the MSN Flathead board a few years ago. The typical scenario where it became a concern was on a modern diesel Dodge dually 1-ton hauling a 10,000 lb trailer through the mountains in the summer at high speed -- conditions not likely on our trucks. Their trans oil temps can get up iunto the 300's!! So they need a cooler. The GL-4/5 oils have an ammonia (amine) compound that gets reactive with copper at the higher temps, but is pretty benign at normal temps.
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Thread Starter
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Laughing Gas
Joined: Nov 2001
Posts: 968
Likes: 71
From: Cherryville,N.C.
Well my shifting is much smoother,but now I have noticed the the tranny is leaking a lot more with the 90W.I wonder if I should go to the 90-140W and if this would slow the leaking?
Elder User
Joined: Jul 2004
Posts: 825
Likes: 3
From: Michigan
Originally Posted by leonharu
Well my shifting is much smoother,but now I have noticed the the tranny is leaking a lot more with the 90W.I wonder if I should go to the 90-140W and if this would slow the leaking?
Would not mess around with synthetic oils in our old trucks, either drive train or engine.
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