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The T-98 is the oldest of Borg-Warner's large production, granny unsynchronized first, heavy duty, four speeds. It was used in Jeep, Ford, and IH 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.
On the Jeep version, 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. The Ford version of the T-98 uses a larger diameter input shaft, so a clutch disk that matches the larger input shaft must be used. If you are planning on converting a transmission, a 2WD Ford T-18 would probably be easier to find and install.
T-98 Identification
The T-98 has been used in Jeeps, Fords, and International Harvesters. Since T-98s were used in so many different trucks, it can be a bit daunting to go out and find one. The following articles cover some things to look for to find the T-98 you need.
Jeep T-98: The T-98 was used in pre 1971 Jeeps.
Ford T-98: Ford used the T-98 in the early 60s.
IH T-98: International used the T-98 in the early 60s.