I am using Royal Purple Synchromax, which is designed for transmissions requiring ATF. Tremec service manual strictly warns against using gear lube in this trans. They state it can result in blocking ring damage.
Anything synthetic ATf will work great bo, some say syncromes from dodge is the only thing to run says it goofs up the ring:dontknow: but I've got 14,000 on mine with redline D4 which I prefer and no problems:rock:
but of course Redline is superior to all
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