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post #1 of 16 Old 09-23-2013, 03:30 AM Thread Starter
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synthetic fluids in differentials?

getting my 99 set up for my main tow rig/work truck. I have a 30 ft dual tandem 20,000gvw g/n I haul tractors, hay farm equipment with. it has 200k on it. will it be ok to switch over the front& rear diif's over to semi syn or full synthetic? and what's weight 85-140???? any input will be appreciated

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post #2 of 16 Old 09-23-2013, 11:14 AM
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rear requires FULL synthetic. 75w-140. make sure it has limited slip additive in it or add some.
front doesn't require synthetic but you can put it in if you want. that one is either 75w-90 or 80w-90 cant remember right now.

oh and i would also flush the transfer case while your doing maintenance. the trans case is often overlooked, when i flushed mine it was way overdue from the previous owner never doing it.

2 quarts of atf, synthetic atf if you want for the trans case.

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post #3 of 16 Old 09-23-2013, 12:14 PM Thread Starter
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I guess I didn't realize the rear required synthetic. I already did the transfer case, it was nasty!!!

99 f250 4x4 7.3 php tunes,20's
01 4x4 cc srw 7.3 550hp BTS trans
02 excursion LMTD 4x4 7.3
95mustang gt,86 5.0,03 gt
allis chalmers 185-d
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post #4 of 16 Old 09-23-2013, 12:43 PM
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I use Mobil1 (SYN) 75W-140 which has the friction modifier already in it.

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post #5 of 16 Old 09-23-2013, 01:15 PM
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ya the trans case is always overlooked.

i used mobil 1 as well. got it at napa 12 bucks a quart i think.

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post #6 of 16 Old 09-23-2013, 01:51 PM
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IMO I think you would benefit greatly by an oversized rear diff cover with all the towing you do. I use Amsoil and I feel it does make s significant difference. Although I run Amsoil in the engine also, I'm still not quite sold on it for that. I'm getting ready to send out the 10k oil analysis here pretty soon.

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post #7 of 16 Old 09-23-2013, 01:59 PM
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Quote:
Originally Posted by blue99stroker View Post
rear requires FULL synthetic. 75w-140. make sure it has limited slip additive in it or add some.
front doesn't require synthetic but you can put it in if you want. that one is either 75w-90 or 80w-90 cant remember right now.

oh and i would also flush the transfer case while your doing maintenance. the trans case is often overlooked, when i flushed mine it was way overdue from the previous owner never doing it.

2 quarts of atf, synthetic atf if you want for the trans case.
You run ATF fluid in your T-case? Hows that work out for ya? Why not just a synthetic gear oil?

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post #8 of 16 Old 09-23-2013, 02:27 PM
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Quote:
Originally Posted by CarportMechanic View Post
You run ATF fluid in your T-case? Hows that work out for ya? Why not just a synthetic gear oil?
Because that's what it requires.

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post #9 of 16 Old 09-23-2013, 02:33 PM
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Quote:
Originally Posted by hucorey View Post
Because that's what it requires.

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So does a manual trans require ATF also? Dont have my manual in front of me or else id look.

Is the T case gear driven or chain driven?

I just cant imagine an ATF fluid would be better for any unit that is gear driven...Or do they say ATF fluid cause most of these rigs came with autos and if the seal between the tranny and T case goes you want the same fluid type so they dont ruin each other.

Thanks.

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post #10 of 16 Old 09-23-2013, 02:46 PM
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Quote:
Originally Posted by CarportMechanic View Post
So does a manual trans require ATF also? Dont have my manual in front of me or else id look.

Is the T case gear driven or chain driven?

I just cant imagine an ATF fluid would be better for any unit that is gear driven...Or do they say ATF fluid cause most of these rigs came with autos and if the seal between the tranny and T case goes you want the same fluid type so they dont ruin each other.

Thanks.
Its ATF because of the metallurgy doesn't require the gear oil of old. Also they have an actual gear pump in them to lube everything instead of relying on the heavy oil to "stick" to the gears n such to get circulated around. They are chain driven.
My transfer case has 416k miles on it. So I'd say use the ATF. Lol. BTW the NP 271/272/273 cases are rated at 7890 ft/lbs of torque. Yes, you read it correct, pretty much bulletproof.

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