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If the parts were from a T85 then they should interchange. The 259 series transmission parts also will interchange with similar transmissions with rectangular side covers as long as they are diamond gear types produced from 1951 on. The major differences between overdrive and non overdrive transmissions is the case and the main shaft. The 49 & 50 Ford car transmissions are similar to the later 259 series but they have the early gears and different clutch mechanical mountings. The 51 Ford transmissions are similar to the 49 & 50 but they have the new diamond gears. Swing pedals came along in 1952 so the cases changed to reflect that. Ford & Mercury cars used the same basic transmission in 52 & 53 but the late 51 Mercury had the different bell housing due to the frame mounted pedals. The T85 transmission was the heavy duty 3-speed in the Y-block years and the 259 series was one of the two light duty transmissions. The other light duty was the T86 top loader in the Y-block years.