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Just wanted to know what type of oil everyone is using in there zf5...weight and kind.... an is anyone using any additive that seems to make a difference. Id also like to find out what wieght and type everyone is using on there axles?
(a) - Ford design conventional axles use Rear Axle Lubricant XY-90-QL or -KL (ESP-M2C154-A) or equivalent.
(b) - Service refill capacities are determined by filling the axle with the specified lubricant to the bottom of the filler hole with the vehicle in running position.
(c) - Plus 8 oz. (U.S. measure) additive friction modifier, C8AZ-19B546-A (EST-M2C118-A) or equivalent for limited-slip applications.
(d) - Rear axle lube quantities must be replaced every 100,000 miles (160 000 km) or if the axle has been submerged in water. Otherwise, the lube should not be checked or changed unless a leak is suspected or repair required.
Note: 6.5 pints of lubricant is the fill specification when the axle is installed in the vehicle. If the axle is out of the vehicle, fill with 7.5 pints of specified lubricant.
Front TTB axles are DANA 50.........
Use axle lubricant F1TZ-19580-A (WSL-M2C191-A) or equivilent..... 1.8 Litres
use atf in the zf5 gear oil is no good for it. when i first got my truck there was gear oil in it and it shifted like crap. zf calls for full synthetic atf 3.4 qts for heavy duty use. if you have the
smf conversion there are people that have overfilled with ATF to quite the rollover down or you can switch to 30wt ATF.