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Technical Info: 3rd Generation: DRIVETRAIN Technical discussion of third generation (2003 - 2007) engine and drivetrain questions, solutions and upgrades.
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Old 1 Week Ago
honda350rmx's Avatar
honda350rmx honda350rmx is offline
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Join Date: Feb 2014
Location: Westminster CO
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Default Diff oil change

so my 2003 just turned 180k. had the 555 engine 6 speed 4X4. i had my diff fluids changed at 75k miles and am wanting to do it agin. this time I want to change it my self. looking over the web there it 75w-90 all the way to 70W-140. i pull a few times a month. and a few times is it at the max of the truck weight. i am thinking about using valvoline full syn 75W90 in both the diffs. just because i can get it thought my work at about $5 a qt. any thoughts on doing this. thanks Nick PS will be changing the trans and t-case at the same time.
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2003 2500HD mbrp 4" exhaust, +50 injectors afe stage 2, kore 2" kit, air bags. Gauge set
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Old 6 Days Ago
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ccmckee ccmckee is offline
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I have the same truck, i changed all of my fluids to Amsoil. I change my driveline fluids every other year and i run 75w-110 in my diffs, i don't tow a lot and usually only run about 15,000 km per year with the truck now, it has 380,000km on it. You will need a big ass allen wrench for the tranny plug fyi, 11mm if i remember correctly.
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2003 QC HO 6SPD, 305/555, 4WD, TST Controller W/monitor, fuel pressure guage, 100% Amsoil

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'96 2500SLT CC LB 2WD, KDP tabbed,100Hp Maxsticks,16* ,3k gsk,afc modded,#8 tst plate,62/70/13 turbo,4" MBRP exhaust,AFE stage III dry filter intake,autometer boost pyro, oil, tran temp,DSS,rebuilt diff & tranny w/billet triple lock TC w/lockup switch,1tn rear cylinders,ride rites on all 4 corners w/on board air,465k km. 330 hp 766 ft/lbs
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