99 & up 7.3L Power Stroke Engine and DrivetrainDiscussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
What lub is good for the Differentials both front and rear and do I need a friction modifier in the rear (LS)
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2002 F250 dark shadow gray/black, 7.3 PSD 4x4 Off-road Crew-Cab short bed 4R100, BMK-16 bypass filter, Magnefine in-line trans filter, WARN locking hubs, 55Watt backup lights, bed liner, Bed Cap
75w-90 for the front and 75w-140 for the rear. You will need friction modifier for the rear. If you go with Amsoil it has the modifier in it. You can't go wrong with Mobil1, Redline, etc. I'm not sure if they have modifier in them or if you have to add some.
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02 F250 XLT CC SWB PSD 4x4, 4R100, AIC, Bedrug, FS-2500 oil bypass, Dieselsite Trans & Coolant filter, 203 T-Stat, Autometer Sport Comps, Silverline 5" stacks, Wicked Wheel, ATS Housing, DP Tuner, Sonnax/Tricumulator, Homemade Tymar, TTM, HX, PML Trans Pan & Diff covers, ITP Reg. Return, AIH, Dick Cepek FC II 285's
Just make sure to use synthetic gear oil too. The correct weights are posted above.
__________________ Excursion Pics
2000 Excursion Limited 4x4 Dark Satin Green Arizona Beige 7.3 DIT, AXDO, 3.73 LS, DP Tuner F5, TERMINATOR II w R-IPR, Adjustable Boost Regulator, Turbomaster, EBPV Delete, Air Dog, ITP Regulated Fuel Return, Fuel Cooler, Tags 1&2, Harpooned Tank, Magnaflow XL Exhaust w Aeroturbine 4040L, Sonnax/Tricumulator, 8 Autometer Sport Comp 4 Gauge A Pillar 4 Gauge Overhead, Ford APCM, Crimestopper Remote Starter With Remote Fast Idle, Ford AIS w Zoodad, W Code Front Modified B Code Rear springs, Rancho RS9000X, Rancho 5406 Stabilizer, Hellwig Rear Sway Bar, BFG Rugged Trail TA, V10 Trans Cooler w Dual Electric Pusher Fans, Coolant Filter, IAH Delete, (((XM))) Line Of Fire Light, Ford Cab Lights, 05 Headlights w GOS Conversion Harness, Jimmi Jammers, 03 Lighted Painted Tow Mirrors w C-BETR, PSD Badges, Pullrite Hitch, Prodigy Brake Controller, Born 01/29/00
I would use a synthetic, try to find one without the friction modifier in it. Than add small amounts of friction modifier until the LS is working the way you like it.
DENNY
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1999 F350 CC SRW LB 4X4 SIX SPEED.
As far as which brand to get, the Ford 75w140 synthetic gear lube is really good stuff. But Ford is really proud of it, so they charge a high price. If you have a convenient source for Mobil 1 lubes, or Redline or AMSoil, maybe check on their price.
For the friction modifier, my dealer put MOPAR brand (from the Dodge Boys) in mine, and it works great. So if you have a Dodge dealer nearby, you might want to try it.
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My Sierra Blanca in the sig pic was a great pickup for 11.5 years. I sold it last year. Replacement is a 2012 F-150 EcoBoost SuperCrew Lariat.
I got 4 qts of Royal Purple 75W/140 from Napa. Supposedly has the modifier in it so nothing else is needed. Then I got 3 cans of brake cleaner. Remove the cover and spray the diff while turning the wheels. Wipe out. Clean VSS. Put some RTV on the cover (after cleaning it). Let it set. Put cover on and fill with Royal Purple. That is it - no modifier, etc.
I have no chatter, and I can leave 2 marks in the dirt - so it is working well...
4 Qts Royal Purple
3 cans brake cleaner (that doesn't leave residue)
Paper shop towels
RTV silicon
I spun the wheels prior to driving to make sure I got some lube into the bearings. Then we spun the wheels in different directions to get the lube into the clutch packs prior to driving.
Good luck!
__________________ 99.5 F-250 CC LB 4x4 7.3 Red New Pics 1/5/10
Trail Boss Replacement Bumpers, Tool Box, Headache Rack, Full Length Running Boards, Bilstien Shocks, BFG AT/KO 285/75x16E, 2003 Cup Holder, Marinco Heater Plug, Weather Tech Rain Vents / Hood Guard, B&W GN Hitch, X-Springs, Rear 4" F350 Blocks, Hellwig front and rear sway bars, Timbrens, Duraflaps
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