![]() ![]() Valvoline uses an inactive sulfate that will not harm any yellow metal such as bronze. You can not use an active sulfate for GL-4 applications. The real concern is the type of sulfate used in the gear oil. ![]() Valvoline indicated: "The Valvoline High Performance Gear Oil 80-w90 can be used for both GL4 and GL5. Apparently activated sulfate (used in some GL5 lubes) can eat brass synchros. They indicated that the issue is with the type of sulfate used in the lube. I emailed Valvoline regarding this (as I haven't seen G元 or GL4 in a very long time). This fluid was discontinued by AMC and currently, Chrysler is recommending the use of G元 gear oil.įrom my limited understanding, G元 is very different from GL4 or GL5. ![]() This was affectionately referred to as "fish oil" by the mechanics or AMC manual transmission fluid (Part Number 8983 000 000). By 1984, AMC started using a proprietary manual transmission lubricant. However, there was a recall for this in 1982 (Recall Number: 82V125000) indicating that the “ORIGINAL PRODUCTION TRANSMISSION LUBRICANT USED IN THE INVOLVED VEHICLES MAY NOT PROVIDE ADEQUATE LUBRICATION TO PROTECT THE TRANSMISSIONS FIRST GEAR.” FSM supplement for 1982 (Tech Bulletin) and the 1983 FSM both indicate to use 90wt in the T-5. When they first came out, AMC recommended using ATF (1982 FSM). A good friend is the Parts Manager at a local Jeep store and works with many mechanics who worked on these, I have looked over Factory Service Manuals from 1982, 1983, and 1984-1986, searched the Factory Recalls, and Tech Bulletins. I have done a decent bit of research on the "correct" fluid to use. ![]()
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