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There were T85 R11C transmissions made from 1949 through the early 60s. The last one was the best one. It was the T85 R11N with the nodular iron case and the better input spline. These were used behind FE V8s in cars and even pickups up to the early 70s. They are the strongest of the whole family of Borg Warner overdrive transmissions.
The T89 was used in Jeeps but I've never seen an R10 or 11 overdrive I stalled in one. The 259 series and T86 top loaders had R10 overdrives.