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It's time for a fluid change what should I put in it? I'm in WA where it gets pretty cold, 89 i6 stock T. My TJ buddy put ATF in his and said it made a huge difference in shifting smoother
 

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You are either running the Puegot tranny or the AX-15. Jeep switched over to the AX-15 in mid 1989.The AX5 and AX15 use about 3.5 quarts. RED LINE MT90 from what i have heard is one of the best fluids, i use amsoil..the AX-15 does specifiy gear lube as its lubricant... But ABSOLUTELY no GL-5 lubes. The high sulfur content will eat the bronze syncros in the transmission.
 
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