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Old 11-25-2015, 12:14 AM   #1
BearChicken
 
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Default Redline MT90 Questions(s)

My mechanic will soon be repairing the MT on my 93 4cyl 4WD. Hopefully, just a bearing going down. He indulges me and lets bring parts, fluids, oils, etc I sourced myself when I want to. Based on reading posts here and elsewhere, I decided to go with Redline MT90 for the tranny.

My questions

Can I use MT 90 for the transfer case as well ?
If so, how much total will I need ?
-I thought 4.25qts for the tranny and 2 3/8 qts for the transfer case based on what I've read so far.

My manual and other sources mention "steering gear oil"- 3/4pt. **This is what confuses me**.

As I understand it, my truck has only four gear boxes- The MT and transfer case which do not communicate, so two there. Then the front and rear diff.

Thank you.
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Old 11-25-2015, 01:49 AM   #2
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Someone double check me but I belive the diffs and T-Case are GL5. Tranny is GL4.

Buy more than you need for the tranny and slightly over fill. Im not sure of quantities for the 4 cyl.
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Old 11-25-2015, 08:22 PM   #3
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Tranny is GL4, diff is GL5. Mine is a 2wd, so I'm not sure about the transfer case.
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Old 11-25-2015, 08:57 PM   #4
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4wd needs to be overfilled. You can Google it. There was a service bulletin I seen somewhere. The redline is awesome. Been running it for awhile.
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Old 11-25-2015, 10:14 PM   #5
Reserector
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MT90 works great in the t-case. That's what I ran in mine.

Won't hurt to overfill, but the only trans that needed it was the v6 until early 90s.

From empty, put 4 1/2 to 5 qts in the trans before you install the shifter. Fill through the shift opening.

I advise replacing the front seal of the t-case while you are at it. I had one that failed, and let the trans oil run into the t-case. The case was overfilled, while the trans front bearing starved to death.
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Old 01-28-2018, 01:15 AM   #6
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My question is, has anyone had any problem with MT-90 affecting the any seals?
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Old 01-28-2018, 02:06 AM   #7
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Don't think it would affect any seals. Will probaby show a tired one real quick. Synthetics are usually thinner than dinosaur oil.
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Old 01-28-2018, 10:20 PM   #8
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mt90 affecting seals in what?

i run it in the trans, and atf in the transfer case. no leaks or issues with the Mt90. its just gear oil. its actually not inherently special. the only seal that could get eaten is the front and rear oil seals. and those are just standard oil seals that are pretty impervious to oils.
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Old 01-29-2018, 02:41 PM   #9
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I ran it for years with no problems. I swear by MT90.
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Old 01-29-2018, 03:37 PM   #10
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i dont think its that good to swear by but its ok.
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