TCase Gear Oil question!

[Arlee]

Refilling my 1984 CJ7 Dana 300 Transfer Case and Dana 30 front diff. Looks like I need a GL4, NOT GL5 gear oil (75w90 or 80w90) to fill both (no Limited Slip additive). (Apparently if it is GL5 rated it has brass corrosive sulfer in it.) I cant seem to find any that isn't also GL5 rated anywhere! Anyone have suggestions on where to find the proper gear oil?

 

[Belizean]

NAPA has Vavoline GL4. I ran a T-4 with Castrol GL5 for almost 1/4 million miles when I had many people saying it would not last. Also the differentials with the Castrol GL5. I run my rebuilt T-176 with GL4 now.

 

[Arlee]

It looks like Valvoline Syncromesh for Manual Transmissions that I used in my T-5 might work as a GL4 gear oil with "roughly 75w-90" weight. Anyone done that in the Dana 300 and front Dana 30 Transmission ? NAPA here doesn't have any GL4.

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[Manic Mechanic]

Amazon

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[Arlee]

Red Line MT-90 appears to be a synthetic 75w90 GL4 gear oil! Found some on Amazon...think that will work for Dana 300 transfer and the front Dana 30 differential.

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