Here is the complete assembly from the bellhousing to the transfer case. The bellhousing is stock for either the 150 or 170. The change starts at the adapter plate between the bell housing and the T-98 transmission. Another adapter plate is needed between the transmission and the transfer case. The front adapter is the same for the 150 and 170. The rear adapter is the same for both models up to serial #9309-24027 & #9325-11002 and then a different adapter is required for the FC-170 model with the "silent" transfer case. There is no mention of a later style plate for the FC-150 model. Although there is only one T-98 transmission, there are different parts to adapt them to the FC-150 and FC-170 models. The two models do not share the same main drive gear (input shaft) or main gear retainer but the shaft and retainer can be changed to fit either model.
This is a closeup of the shift forks of the T-98's transmission control housing. As you can see, this is completely different than the T-90 3-speed shift mechanism.
This picture shows the shifter and the control rod assembly minus the rear transmission mounting bracket. They are the same for either FC model.
This bracket mounts on the top of the transmission control housing and the shift rod control assembly bolts to it.
This should come with your T-98 transmission. It is the main drive gear bearing retainer. It is different from the T-90 version. There are two different retainers for the t-98 transmission. #910470 fits the F-134 engine & #916341 fits the L-226 engine.
A closeup of the pivot arm that is on the rear of the rod control and engages the T-98's shift forks.
Closeup of the T-98 shifter.