Redline MT-90 in Toyota Xfer case

Messages
52
Location
NY
Just bought a '92 Toyota pickup 4X4, and the manual tranny is real notchy and tough to get into 1st gear sometimes, this is usually an indication that GL-5 has been put in the tranny, as Toyota manual's don't like GL-5 all that much, shifting wise, not talking about the whole sulfur eating at the yellow metals thing, don't want to get into that. Anyway, I am gonna order some Redline MT-90 GL-4 to put in it, but was just wondering if MT-90 is good for a Xfer case also, might as well put the MT-90 in there while I'm under there, but not sure if I should use straight gear oil. I don't think Xfer cases use hypoid gears, so I would assume that a good synthetic GL-4 like MT-90 would be good in there. Any advise? Thanks.
 
Messages
8,756
Location
RI
If the transfer case can, then go ahead. But, if the xfer case requires GL5, then you have to use it. I would use a GL5 in a xfer case. Usually they are small gearboxes with small sumps. Every bit of additional protection can only help. GL5 in the transfer and MT90 in the manual is what I would use.
 
Messages
456
Location
CA
Sorry, cant help with the X case question, but wanted to echo your feelings on MT90 in Toyota MT's. I dropped the factory fill in my 5 speed Scion, refilled w/ MT90 and noticed an improvement. My manual calls for GL5 or GL4, but stick with the 4 if you have a Toyota.
 
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19,479
Location
Chicago Area
The transfer case has no shifting or synchros, and does not need friction modified GL4 gear lube. I would use a dedicated gear lube in the transfer case.
 
Messages
509
Location
VA
 Originally Posted By: Chero87
Just bought a '92 Toyota pickup 4X4, and the manual tranny is real notchy and tough to get into 1st gear sometimes, this is usually an indication that GL-5 has been put in the tranny, as Toyota manual's don't like GL-5 all that much, shifting wise, not talking about the whole sulfur eating at the yellow metals thing, don't want to get into that. Anyway, I am gonna order some Redline MT-90 GL-4 to put in it, but was just wondering if MT-90 is good for a Xfer case also, might as well put the MT-90 in there while I'm under there, but not sure if I should use straight gear oil. I don't think Xfer cases use hypoid gears, so I would assume that a good synthetic GL-4 like MT-90 would be good in there. Any advise? Thanks.
Jumping in on this thread a little late but I have a 99 4WD Tacoma. The owners manual states to use a GL4 fluid in the manual transmission and the transfer case as well. Mt 90 is a popular choice for the M/T and transfer case on Toyota trucjs.
 
Messages
509
Location
VA
 Originally Posted By: wantin150
Thought MT90 said not good for Xfer cases.
My owners manual calls for a 75w-90w GL4 lube for the manual tranny and transfer case. MT90 fits this description. If you do a search at TacomaTerritory.com, you will find it is a very popular choice for these applications.
 
Messages
177
Location
Texas
Mine is an '08 Tacoma 2.7L 5-speed M/T, 4 wheel drive. I've got the Redline MT-90 in the 5-speed and Mobil-1 75W-90 in the front differential and in the transfer case.
 
Messages
509
Location
VA
 Originally Posted By: SargeBB
Mine is an '08 Tacoma 2.7L 5-speed M/T, 4 wheel drive. I've got the Redline MT-90 in the 5-speed and Mobil-1 75W-90 in the front differential and in the transfer case.
Just curious, does your 08 manual call for a GL4 gear oil in the manual tranny?
 
Last edited:
Messages
1,899
Location
Columbia, SC
 Originally Posted By: klt1986
 Originally Posted By: wantin150
Thought MT90 said not good for Xfer cases.
My owners manual calls for a 75w-90w GL4 lube for the manual tranny and transfer case. MT90 fits this description. If you do a search at TacomaTerritory.com, you will find it is a very popular choice for these applications.
My bad. I was thinking about the rear diff, not the transfer case. Duh!
 
Messages
2,689
Location
South Carolina
GL-4 or 5 in the xfercase. For extreme use a GL-5 would be a bit heavier duty. No hypoid gears in there, though, so a GL-4 would be fine. Other brands of T-cases call for ATF which is about a 5W-20 viscosity. So a 75W-90 GL-4 is already a huge step up in protection over a thinner ATF, plus it has EP additives. GL-5 gear oil has at least twice as much EP additive in it than the GL-4.
 
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