1986 and 1987 turbo Buicks came with the 200-4R transmission coded BR-F, the "BR" of the transmission denotes internal parts & valve body calibration of the unit. The letter "F" denotes that the transmission is a 200-4R. GM decided to add a third letter to the code in 1986, previous years, such as a 1985 turbo Buick would be coded BQ.
The valve body, spacer plate, governor, intermediate servo and a few hard parts are the main difference between units. All 200-4R’s use the same band and clutches.