Diff Trans fluid?
Jun 8, 2009 | 09:13 PM
#1
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Joined: May 2008
Posts: 3,948
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From: Calgary, AB Canaduh
Diff Trans fluid?
Alright so i got 10 bottles(1qt) of Castrol syntec gear oil. Sae 75w-90.
According to 4crawlers webside,
"Manual Transmission GL-4/5, 75W90 22R: 4.1 qt. 22RE: 3.2 qt."
"Differential Hypoid GL-5, 80W90"
My one friend thats a tech said i can just use the same oil on both and said it wouldnt make that big of a difference.
But, i was reading on 4crawlers website and...
"# GL4 rating, I find MT-90 makes the tranny run quieter than MTL and it shifts just as smooth.
# You want to avoid running a GL5 oil in the transmission. The EP additives in a GL5 oil can attack the brass synchro rings on transmissions not rated for GL5 oil (the Toyota transmissions are rated GL4/GL5) and they can make the oil too slippery for proper synchro operation (shifting will feel sluggish - and this does apply to Toyota transmissions). "
Now, on the castrol syntec bottle it says gl-5 gear oil... so should i just run it in my diffs?
Anyone else run just gl5 in their trans?
According to 4crawlers webside,
"Manual Transmission GL-4/5, 75W90 22R: 4.1 qt. 22RE: 3.2 qt."
"Differential Hypoid GL-5, 80W90"
My one friend thats a tech said i can just use the same oil on both and said it wouldnt make that big of a difference.
But, i was reading on 4crawlers website and...
"# GL4 rating, I find MT-90 makes the tranny run quieter than MTL and it shifts just as smooth.
# You want to avoid running a GL5 oil in the transmission. The EP additives in a GL5 oil can attack the brass synchro rings on transmissions not rated for GL5 oil (the Toyota transmissions are rated GL4/GL5) and they can make the oil too slippery for proper synchro operation (shifting will feel sluggish - and this does apply to Toyota transmissions). "
Now, on the castrol syntec bottle it says gl-5 gear oil... so should i just run it in my diffs?
Anyone else run just gl5 in their trans?
Jun 9, 2009 | 07:25 AM
#4
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Joined: Apr 2008
Posts: 292
Likes: 0
From: Glendale AZ
I've been running Royal Purple "Max Gear" gear oil for years now with no issues and my trans shifts super smooth. I use it in both diffs and transfer case too. I just followed what my manual said for my 91'...
Manual Transmission with 4WD – Model # W56. 3.2 qts. API GL – 4 or GL – 5.
SAE 75W – 90 or 80W – 90.
From their website = "Max-Gear is recommended for use in truck, motor home / RV, and automotive front or rear differentials, manual transmissions, and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. All viscosities of Max-Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary."
Manual Transmission with 4WD – Model # W56. 3.2 qts. API GL – 4 or GL – 5.
SAE 75W – 90 or 80W – 90.
From their website = "Max-Gear is recommended for use in truck, motor home / RV, and automotive front or rear differentials, manual transmissions, and lower gear units of marine engines that specify use of an API GL-5 or GL-4 fluid. All viscosities of Max-Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary."
Jun 9, 2009 | 08:01 AM
#5
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Joined: Jan 2009
Posts: 6,086
Likes: 17
From: Just North of Pittsburgh
I've been dumping Lucas in lately and have been happy with it. I need to change out the trans fluid and I think I'm going to 50-50 it in the pickup. So far it's been nice in the diff's, although I just topped them off with it.
Last edited by Lumpy; Jun 9, 2009 at 08:02 AM. Reason: trans type
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