GM TH350 4WD Transmission To NP231 21Spline Transfer Case Adapter Fits 1987 to 1989 YJ Wrangler;Fits 1987 to 1989 XJ Cherokee;Fits 1987 to 1989 MJ Comanche;This kit is for 4WD GM TH350 transmissions Advance Adapters Advance Adapters GM TH350 4WD Transmission To NP231 21Spline Transfer Case Adapter - 50-6306 50-6306 Transmission Adapters