Limited slip additive?
#1
Limited slip additive?
I have an FX4 with a limited slip differential. I want to change my gear oil because I'm worried that I might have been in water up past the top of the vent tube. Before I realized that I needed to add the Ford limited slip additive, I went and bought some gear oil. This is the stuff I bought:
It says limited slip on it so this is my question.. Does this contain a suitable additive? If not, is it okay to use with the additive or should I buy regular non-limited slip oil and then the proper additive? Finally, do I have to go to Ford for the additive or is available at parts stores? Thanks.
It says limited slip on it so this is my question.. Does this contain a suitable additive? If not, is it okay to use with the additive or should I buy regular non-limited slip oil and then the proper additive? Finally, do I have to go to Ford for the additive or is available at parts stores? Thanks.
#2
#3
Generally if it is a limited slip oil it contains the additive.
Personally, I would use that stuff and see how it works. You can always add a bottle of additive later if the differential is too tight and chattering. I would rather have too little than too much when it comes to a limited slip additive, but that's me.
Personally, I would use that stuff and see how it works. You can always add a bottle of additive later if the differential is too tight and chattering. I would rather have too little than too much when it comes to a limited slip additive, but that's me.
#4
I always used Lucas in the ranger, it has the additive. and I'm running Royal Purple (which has the additive) in my Z71s rear axle.. the LS seems to be functioning properly.
On the other hand, the posi 9" 3rd member I had for the Ranger. I put in the cheapie gear oil and the ford additive.. and nothing.
On the other hand, the posi 9" 3rd member I had for the Ranger. I put in the cheapie gear oil and the ford additive.. and nothing.
#8
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IIRC, Rick over at ORR who worked on developing the Torsen for the LII stated that the call for 75-140 was based on the 31 spline axle. It did not NEED the 75-140, but it was carried over from the Ex axles that were under harsher conditions, i.e. V8s, higher tow rating, etc. That's all what I remember, could be wrong a few places...
#12
4. CAUTION: First fill the rear axle with 118 ml (4 oz) of friction modifier.
NOTE: Service refill capacities are determined by filling the rear axle to the level shown.
Fill the rear axle with 2.54 liters (5.37 pints) of rear axle lubricant and install the filler plug.
NOTE: Service refill capacities are determined by filling the rear axle to the level shown.
Fill the rear axle with 2.54 liters (5.37 pints) of rear axle lubricant and install the filler plug.
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