tompett Posted October 9, 2020 Share Posted October 9, 2020 Trying to understand the Trico part numbers. My 1956 Buick parts catalog are listing the 10.159-4573900: Trico 86120-C (RH) to fit 1950 all, 1951-53 series 50/70 . According to the listing this part also fits 2-4 (Oldsmobile -Cadillac). In the 1956 Cadillac catalog, however, the 1950-53 the RH transmission is listed with part number 4617112: Trico 86120-1C. What are the difference between 86120-C and 86120-1C? Will they interchange? Tom BCA#8163 Link to comment Share on other sites More sharing options...
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