Bronco Full Size L6-300 4.9L (1987)
Differential Case: All Technical Service Bulletins
Rear Axle - Correct Routing
Article No.
91-15-11
07/24/91
AXLE - VENT HOSE ROUTING - 8.8 INCH AND 10.25 INCH RING GEAR REAR AXLES
LIGHT TRUCK:
1987-91 BRONCO, F-160-350 SERIES
ISSUE:
Rerouting of the rear axle vent hose provides better protection against water entering the axle through the vent hose.
Figure 1
Figure 2
ACTION:
Check the location of the rear axle vent hose routing which is identical for F-150/250/350 and Bronco Light Trucks. The rear axle vent
hoses are mounted on the left hand frame rail (driver's side). This location provides better protection against water entering the axle
through the vent hose. Refer to Figure 1; Correct Vent Hose Routing. Previously, vehicles with aft fuel tanks were equipped with the vent
hose mounted on the aft axle cross member. This routing has been discontinued. Refer to Figure 2; Incorrect Vent Hose Routing.
NOTE:
ALWAYS CHECK TO MAKE SURE THE AXLE VENT AND VENT HOSE ARE NOT PLUGGED WHEN SERVICING AXLE.
