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Old November 2nd, 2007, 02:22 PM   #1
shawn
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Default Diff Fluid

What viscosity should be used in the diffs? I got 44's, with Detroits, and I have normally run 80/90W, but recently I've seen many things using the 140W stuff. What do you use?
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Old November 2nd, 2007, 02:25 PM   #2
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80/90
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Old November 2nd, 2007, 02:28 PM   #3
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i use royal purple 85/140 for l/s and traction devices
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Old November 3rd, 2007, 06:12 AM   #4
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when I was doing Gm stuff at the dealer I used 80/120w in the big diffs with no posi. everything else got the premium Gm Posi oil with friction modifier
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Old November 3rd, 2007, 07:16 AM   #5
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85/140
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Old November 3rd, 2007, 09:53 AM   #6
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I use cheap 80/90 because I like to change it every couple trips or so.
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Old November 3rd, 2007, 06:05 PM   #7
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80/90
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Old November 3rd, 2007, 06:26 PM   #8
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140w for the rear

80/90 front
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Old November 3rd, 2007, 07:16 PM   #9
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Generally for off road use you only need 80/90 unless you are running a limited slip. Limited slips usually require 75/140 synthetic. The only reason for running a heavier wt gear lube is if you have a heat problem in the diff. This is usually caused by higher speeds. In cooler weather heavier gear lube will not lubricate as well since it has a harder time getting to the bearings where it is needed most.
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Old November 3rd, 2007, 07:20 PM   #10
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Quote:
Originally Posted by sodapop View Post
I use cheap 80/90 because I like to change it every couple trips or so.
yup x2

and if I have one thats a little sketchy I use Lucas(SP)
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Old November 3rd, 2007, 08:26 PM   #11
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Quote:
Originally Posted by sodapop View Post
I use cheap 80/90 because I like to change it every couple trips or so.
X3

The synthetic stuff is too pricey to put in a trail rig.

If it's your DD, you could run the synth stuff.
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Old November 3rd, 2007, 08:27 PM   #12
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Quote:
Originally Posted by GNJEEPN View Post
Generally for off road use you only need 80/90 unless you are running a limited slip. Limited slips usually require 75/140 synthetic. The only reason for running a heavier wt gear lube is if you have a heat problem in the diff. This is usually caused by higher speeds. In cooler weather heavier gear lube will not lubricate as well since it has a harder time getting to the bearings where it is needed most.
No, limited slips require an additive.

The newer vehicles run the synthetic and an additive, but you can still run 80/90 with the additive.
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Old November 3rd, 2007, 09:47 PM   #13
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Gear-driven Detroit TruTrac LSD doesn't require a friction modifier because it doesn't have clutch packs.
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