I have 76 Blazer(400cu in, TH400?, full-time 4x4) that I just bought and I am sure it has a part time 4x4 conversion kit made by a company called 'Hall RaceProducts'. i have never heard of this company. This is an old pamphlet with phone number that no longer exists. Any help here would be appreciated. Also, I believe the xfer case is NP203/ full time 4x4. Someone also put Warn hubs on it too. Is this co. still around? can i get parts somewhere else? What are some company names that make the conversion kits? Can I put in a NP205 manual 4spd and use the axles that go with it with cross member without any other cutting/welding? Are conversions hard on the transfer case? Thanks and sorry for all the questions!