No idea its a good question for the Jeep engineers.
I replaced mine with a used unit on Ebay. Wait around for one cheap it was easy to replace and everything works.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184