Originally Posted by mossyoak03
I believe the internals are weaker that's why you only find them behind the 2.9. I don't know if they were used on any 4 cylinder or old 3.0 engines but I know that the 4.0 always used the 54 case.
Some more info:
BW1350 & BW1354
The 1350 and 1354 are both 3-piece aluminum part time transfer cases. They both transfer power from the transmission to the rear axle and when actuated, also the front drive axle. The unit is lubricated by a positive displacement oil pump that channels oil flow through drilled holes in the rear output shaft. The pump turns with the rear output shaft and allows towing of the vehicle at maximum legal road speeds for extended distances without disconnecting the front and or rear driveshaft. The 1350 has a splined front receiver where the front driveshaft slides in. The 1354 has a yoke on the front that accepts a u-joint and holds it in place with straps. The 1350 and 1354 are produced as a mechanical shift and electronic shift.