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Old 02-21-2010, 08:20 AM   #1
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Changing Front Differential Fluid

Was going to change the fluid in the front differential in my 2007 4x4 SMB with an ARB locker that I purchased last month with 3 qts Amsoil 75W90 Gear Lube, and was wondering if the best plan was to take the front cover off to let all the old lube drain out - then scrape off the old sealant and put new RTV gasket maker and refill with fluids. Just checking to see if the Dynatrac Prorock 60 had any special problems doing it this way.

I didn't have much luck sucking the lube out so thinking about "Plan B"
Thanks,
Scott
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Old 02-21-2010, 08:37 AM   #2
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Re: Changing Front Differential Fluid

Plan B. You can inspect your gears and get any bits of crud out of the bottom of the diff. Use a rag and get as much crap out or the bottom as you can. A gasket is better than silicon because silicon will allow the cover to squirm around. The cover is a structural part of the housing and letting it move compromises it's strenth. Do as I say not as I do because I've siliconed a lot of them on but it's better to use a gasket. Put the silicon on both the cover and the housing after they are spotless and degreased. Let the silicon get just dry enough that you can touch parts of it with your finger without the silicon sticking to it. Just untill it starts to skin over. Some say screew it on loose and go back later and tighten but on a diff you may get those last bits of gear lube contaminating your silicon so I just let them skin over and put them on. Those cover bolts are tiny so go easy.
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Old 02-21-2010, 08:49 AM   #3
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Re: Changing Front Differential Fluid

Thanks so much for the quick reply- I'm going to get right on it. You guys are great!
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Old 02-21-2010, 10:04 AM   #4
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Re: Changing Front Differential Fluid

I prefer a gasket with RTV blue on each side. Among other things it helps to keep it in place.
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Old 02-21-2010, 12:20 PM   #5
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Re: Changing Front Differential Fluid

Gees, now if I can only find a socket for the fasteners on the Dynatrac - I guess I need a "spline" type socket or a socket with a lot of points. Anybody know what size and description of socket this takes -think I just need some 12 pt sockets - should do the job
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Old 02-21-2010, 01:40 PM   #6
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Re: Changing Front Differential Fluid

Wouldn't happen to look like these?



That's reverse Torx, or Torx head bolts. You can get the sockets at Sears... because SAE, Metric and regular Torx weren't enough...
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Old 06-01-2010, 09:51 AM   #7
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Re: Changing Front Differential Fluid

I'm way overdue for changing my front axle lube. Anyone know what size reverse torx socket I need pictured in Jage's post above? Don't care to buy a complete set.

thanks -
Phil
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Old 06-01-2010, 08:23 PM   #8
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Re: Changing Front Differential Fluid

If it is a Dynatrac Proroc 60 front differential that would be 5/16 12 point socket - no need for reverse torx socket.

Scotty
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Old 06-02-2010, 07:58 AM   #9
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Re: Changing Front Differential Fluid

Thanks Scotty.

Phil
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Old 01-16-2011, 11:59 AM   #10
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Re: Changing Front Differential Fluid

Hi Everyone,

Over Christmas my yearlong project came to fruition and I picked up my 2010 SMB in Las Vegas, nicked named Kitten for being so small and inconspicuous. She has front and rear Dynatrac, each with ARB air lockers. The Atlas transfer case requires a lube change at 500 miles and the ARB air lockers require a lube change of both differentials after 1500 mile break in period. I was having too much fun to get that far in the manual until I returned home to Portland. Has everyone done these changes after the manufacturer specified break in period? Of those who have done this job themselves, is it pretty involved or similar to changing oil and transmission fluid. Open the drain, and refill? What volume of lube is required for each component? I hear 2 quarts for the Atlas transfer case, but unable to find information on the differentials. Last question is the differential lube recommended for Dynatrac is Synthetic 85W140 GL6 or 75W140 GL5. Other forums stated that for our particular setup, GL6 is preferred. Have you used either?

Your thoughts are appreciated.
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