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Old 10-20-2015, 08:00 AM   #1 (permalink)
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Default Trans Oil etc?

What oil should I use in the Transmission, Transfer Case and Diff's?

It's an 1987 Samurai.
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Old 10-20-2015, 09:41 AM   #2 (permalink)
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I have a few posts on this very subject, it has come up more than once. Rather than finding my thread and linking it I'll just say that after I rebuilt my trans with new OEM bearings and synchros. I tried the autoparts store GL-4 compatable but actually GL-5, which left the shifting notchy and reluctant. I tried Redline synthetic GL-4 expecting a super slick shift and this product and it was really no better than the above mentioned GL-5. The shifting was just not good enough for having just completely overhauled the transmission, I was looking for it to shift like new since it essentially was.

I talked to a few of the older gents and came around to using standard traditional conventional GL-4. I could not find it at the auto parts store but a few folks say SOME NAPA stores MAY carry it, my local NAPA did not, they had the same GL-5 backwards compatible stuff I tried first. I ended up at the Ford stealership. The pic below is what I got and still using, I'm delighted with the way it now shifts. Dont let the counter guy tell you that the GL-5 they have on hand will work the same and is fully backwards compatible. It's a little more expensive but it's basically free once you enjoy proper shifting.

The diffs and xfer case will be less picky as you dont have to constantly shift them. I left the Redline in the transfer case and standard GL-5 in the Toyota diffs. I use lighter weights as winter here can be wicked.
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Trans Oil etc?-gl4.jpg   Trans Oil etc?-gl4_2.jpg  
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87 Samurai ragtop, 16v 1.6L MPFI, Thorley header, 2.25" exh w/magnaflow cat & muffler, full custom dash & instruments, PS, AC, 410 Toyota axles w/rear lockrite and front ARB, Jeep YJ springs, Missing links, 6.4:1 xfer gears with twisted T conversion, early 5 speed, 35x12.5 Wranglers. .
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Old 11-19-2015, 07:30 PM   #3 (permalink)
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I have two 1987 Samurai s and use Mobil synthetic 50w gear lube, works best in the cold climate around here.
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