Clyde in the post I said the dealer installed it when I purchased it. It came with the 2.90. Yes it has a different carrier for the 3.90 with POS. and is a 7.5" stock 4X4
You can not drive on a long trip with 13" tires as it is at about 3000- 4000 RPM's at 65 MPH. But no shifts in a 1/8 mile with the powerguilde. Been in the garage sense the mid 80's That is why I have replaced it with a 9.5" so I can drive it on the road again. Just realized that the stock sway bar will not clear the new rear it is a lot bigger than I thought but I don't think I can break it