How to change Diff fluid on a 04-08 f150
02-25-2017, 07:59 PM
#42
TOTM 8/2019
You don't ever need to change the rear axle lubricant on an F150 unless it was submerged in water.. This is straight from the Ford maintenance schedule and manual:
"❑ Rear axles and power take off (PTO) units containing synthetic lubricant and light duty trucks equipped
with Ford-design axles are lubricated for life. These lubricants are not to be checked or changed unless
a leak is suspected, service is required or the axle assembly has been submerged in water. The axle
and PTO lubricant should be changed anytime the axle and PTO have been submerged in water. During
extended trailer tow operation above 70°F (21°C) ambient and wide open throttle for extended
periods above 45 mph, non-synthetic rear axle lubricants should be replaced every 3,000 miles or
3 months, whichever occurs first. The 3,000 mile lube change interval may be waived if the axle was
filled with 75W140 synthetic gear lubricant meeting Ford specification WSL-M2C192-A, part number
F1TZ-19580-B or equivalent. Add friction modifier C8AZ-19B546-A (EST-M2C118-A) or equivalent for
complete refill of Traction-Lok rear axles (see “Owner’s Guide” for quantity). The axle lubricant should
be changed anytime an axle has been submerged in water."
"❑ Rear axles and power take off (PTO) units containing synthetic lubricant and light duty trucks equipped
with Ford-design axles are lubricated for life. These lubricants are not to be checked or changed unless
a leak is suspected, service is required or the axle assembly has been submerged in water. The axle
and PTO lubricant should be changed anytime the axle and PTO have been submerged in water. During
extended trailer tow operation above 70°F (21°C) ambient and wide open throttle for extended
periods above 45 mph, non-synthetic rear axle lubricants should be replaced every 3,000 miles or
3 months, whichever occurs first. The 3,000 mile lube change interval may be waived if the axle was
filled with 75W140 synthetic gear lubricant meeting Ford specification WSL-M2C192-A, part number
F1TZ-19580-B or equivalent. Add friction modifier C8AZ-19B546-A (EST-M2C118-A) or equivalent for
complete refill of Traction-Lok rear axles (see “Owner’s Guide” for quantity). The axle lubricant should
be changed anytime an axle has been submerged in water."
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o6S1D9e (10-14-2021)
03-23-2018, 05:26 PM
#43
Administrator
Just started my diff fluid replacement today. Anyone know the recommended torque specs for the diff cover? The OP (of this very old but great thread) doesn’t really state specifics.
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o6S1D9e (10-14-2021)
03-23-2018, 06:13 PM
#45
Administrator
03-23-2018, 06:21 PM
#46
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o6S1D9e (10-14-2021)
03-23-2018, 08:30 PM
#50
Administrator