These are a DIRECT bolt in with ZERO mods needed. If you can't make any boost without spinning the tires, this might be just the thing to fix that.
Grand National LARGER rear brake cylinders - Monte 442 G-body Buick Regal T-type
Grand National Floater Rear End Drive Flange O-Ring for 5x5 Hubs Rubber
Grand National Floater Rear End O-Ring | 5x4.75 Hubs Rubber Seal
NEW Stock Car Products Grand National rear 5x5 hubs w/ races & studs pair NASCAR
PEM Grand National Centerless Tube for Quick Change Rear End 24in Tube
Spindle Outer End Seal for 2-1/2" Spindle on Grand National Rear - Pair #1094