12HT and A440 Lugging/Vibration in Overdrive Help Needed
By inv3ctiv3
Ok so I've been wracking my brain about how to fix this but my HJ61 has this very specific low frequency "womp womp womp" lugging vibration sound and feeling as soon as the truck shifts into OD and only on throttle. I measured my flange angles, removed the driveshaft and drove it in FWD and it still did it (albeit less than normal). This feels more like it's shifting into OD and the revs drop down to like 1300ish and the vibration speeds up and goes away as I go faster but it feels like it... Read more




