The Redline gear lube we used to get was GL5 spec. But anyways messed up cv joints in he axle will usually cause a very nasty vibration while accelerating. Might wanna check those as well. Also check and make sure the intermediate shaft didn't com loose fom the block. Being now you say it shakes in neural kinda throws it off from being a trans problem...
Broke discs usually wont cause any vibration. ACT discs break all the time as well. I've broken a few but never had any vibration from it, just usually wont let you in gear
Nick
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