« Last post by lone walker on Yesterday at 07:23:26 PM »
You will need to notch the housing, but why? It'll be better to run the hp third with a selectable than swap it to a standard pinion.
Basically, just crawl under there and see how much play there is in the driveline. If any up-dow, side-to-side, means they need to be replaced. The only movement should be when twisting it, and that amount should be slight, as it is just the slack in the trans gear.
Sound's like it is the driveline or a bearing issue in the rear axle. If you can put the rear up on a jack, and spin the tires, and see what you hear/see. Also, see what amount of play you have in the driveline, shouldn't be any up or down movement, and 9nly slight when turning it, about an 1/8".
Before the vibes started, had you noticed a ting sound, like a wrench smacking a pipe, when taking off, backing up. The sound is an early warning that the u-joints are starting to go.