I have a 85 GMC 1500 short bed . I want to narrow the rear axle to 60" about 1.5" per side , tires hitting 1/4s . What GM corporate 8.5 axles will fit the 1500 axle housing and bearings . Will Chevelle , Nova , F body , or ? fit . I have tried to match up the sizes but it looks like the axle...