There is overlap between the life of Borg-Warners heavy duty four speeds, but basically the T-19 followed the T-18. The T-19 was the first one to offer a synchronized first gear. Typically, this meant that first gear wasn't as low. The exception to this rule was the rare wide ratio T-19 used in IH trucks. Wide a close ratio versions of the T-19 were used in IH trucks, so most T-19s in IH trucks are not the wide ratio version. The T-19 was also used in Ford trucks.

The input bearing retainer size (4.85") and often the input shaft length is compatible with the bell housing used with the T-150, T-176, T-5, T-4, SR-4 and of course Jeep T-18. The input shaft length varies depending on the application, but the shaft can be cut and resplined or an input shaft of the appropriate length can be installed. If this transmission is to be used with a Jeep Dana 300, it is easiest and cheapest to buy a 2WD Ford version. The 4WD IH version should be bolt compatible with a Dana 20 or Dana 18, but input shafts are typically on the long side.