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HELP!! 86 4 spd trans fluid

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Old Jan 19, 2010 | 12:08 PM
  #1  
77h0t_r0d_wrecker's Avatar
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HELP!! 86 4 spd trans fluid

I'm sure this question has been asked before, but I searched for the last half hour, and I can't find anything. Sorry in advance.

What kind of fluid should I put in my 4 spd manual with a granny gear? It looks and smells like burned ATF that came out, but it stained my hands yellow... The old chilton's manual that I have that covers multiple trucks says to use Ford Manual Trans. Lubricant, but I really don't want to go to the dealer for it, and I don't really think I need it; there has to be something off the shelf that is equivalent or better. Local parts stores say put 80-90 gear lube in it, but that's their opinion, it's not on their computers; to me it seems too heavy.

What say you great enthusiasts? Thanks in advance for your help!
 
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Old Jan 19, 2010 | 02:24 PM
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Your local parts store would get my vote, 80W90 gear oil.
Hopefully you will get a second opinion.
 
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Old Jan 19, 2010 | 02:40 PM
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i filled mine with lucas, i think it was a 75-90 weight. worked great, i was happy with it
 
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Old Jan 19, 2010 | 06:59 PM
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On four wheel drive models, the transfer case takes AFT (depending on model year), but the transmission should be 80/90 gear oil or similar.
 
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Old Jan 20, 2010 | 07:35 AM
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I'm just afraid of the gear oil being too thick and not properly lubricating the gear box. I live in the Poconos in PA and it's cold up here.
 
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Old Jan 20, 2010 | 09:14 AM
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I have 75W90 synthetic gear oil in mine. I changed the old fluid for preventive maintenance and noticed that the transmission shifted with considerably less effort as a result.
 
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Old Jan 20, 2010 | 01:46 PM
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X2. I put in the 75W-90 when I did the clutch. It shifts so much better, but the pilot bearing being shot didn't help...
 
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Old Jan 20, 2010 | 05:49 PM
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Originally Posted by 1986F150six
I have 75W90 synthetic gear oil in mine. I changed the old fluid for preventive maintenance and noticed that the transmission shifted with considerably less effort as a result.
Did you have ATF in the gearbox before?
 
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Old Jan 20, 2010 | 05:54 PM
  #9  
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Mine had gear lube in it, if that helps... Someone may have put the trans oil in in thinking it was like the M5OD or something...
 
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Old Jan 20, 2010 | 06:33 PM
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the 75w90 synthetic sounds good....but so does the lucasoil
 
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Old Jan 20, 2010 | 06:39 PM
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Manual Transmissions:

All models - SAE 85W/90 gear oil



Automatic Transmissions:



C4 - Type F

C5 - Type H

C6 - 1976 Type F; 1977-86 Dexron®II

AOD - Dexron®II ATF
 
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Old Jan 21, 2010 | 10:34 AM
  #12  
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77hOt_rOd_wrecker,

Mine had gear oil in it prior to my replacing it with synthetic 75W90 gear oil.
 
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Old Jan 21, 2010 | 02:36 PM
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Originally Posted by 77h0t_r0d_wrecker
I'm just afraid of the gear oil being too thick and not properly lubricating the gear box. I live in the Poconos in PA and it's cold up here.
I grew up in northern michigan, never had a problem with 75-90. the oil will lubricate just fine. you'd be at more risk of problems running too thin of an oil than too thick. they make an 85W140 weight synthetic. i ran that too for a short while just cause i got it for free (buddy's dad owned a shop and had to dump some material...) i didn't have a problem with that either.
 
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Old Jan 22, 2010 | 10:20 AM
  #14  
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Well thanks for all of the input guys, looks like I'll run gear oil. It's funny though, the ford dealers I called said they didn't know or said to put trans fluid in it if that's what came out. I didn't think our trucks were THAT out of date.
 
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Old Jan 22, 2010 | 10:45 AM
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Like most counter people, they are too lazy to look it up. It much easier to say "I don't know". They need to get you out of the way so they can sell someone a vehicle or some parts so they can make some money.
 
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