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Old 10-12-2016
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Ford Ranger Fx4 questions

hi guys, quick question regarding the FX4 level 2 model, 2003. I am doing some maintenance on my truck to get it ready for winter. I would like to change out the gear oil in front and rear to get an inspection of the gears and continue with maintenance.

What type of gear oil should i stick in the rear? I think its limited slip so I would need some additive right? i am thinking on 75 w 140 synthethic for rear and 80w90 upfront regular.

Additionally, my truck is 5 speed 4x4. What other fluids should i be changing out other then gear oil and engine oil and coolant?

Also I need to put my front driveshaft back in but noticed that the PO had a broken bolt on one of the yoke straps. Theres a partial bolt stuck in the yoke. Should i drill it out and convert to u bolts or just try to extract it somehow? Thanks
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Old 10-12-2016
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Ranger fluids and capacities here: Ford Ranger Fluids & Capacities

You can get rear axle fluids with modifier already mixed in.
Modifier doesn't hurt OPEN differential axles, so while you for sure have Limited Slip in a Level II, pre-mixed modifier can be used even it it isn't
Level II may/should have Torsen rear axle, Torsen specifies 75W140 synthetic lube and it doesn't need the modifier since it uses gears not clutch plates, but again it would hurt.


I would use a Reverse Drill Bit and drill out the broken bolt.

An old exhaust shop trick is to heat up the bolt and then press a candle(wax) against it, the wax will be pulled down into the treads and help loosen them.

Last edited by RonD; 10-12-2016 at 10:50 AM.
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Old 10-12-2016
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Perfect, answered everything! Much appreciated. I have heard good things about the Torsen. Coming from being a jeep owner its much more piece of mind having a axle better then a dana 35 rear axle
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