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Differentials

PRanger

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I am gonna drain/suction and refill my diffs but when i opened the fill plug on the front it was pouring out oil.. Does that mean the oil was sitting on top of water that got in my diff? I did go through some high water about fog lights or so high.
Or did somebody just overfill it and stuck the plug on when it was still pouring out? What are some consequences from water in your differential? And just to clarify... It is 80w90 gear oil in both diffs or 80w90 in the front 75w140 in the rear? 98 4x4 7.5 L/S w/ Trac-Lok



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LIMA BEAN

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I am gonna drain/suction and refill my diffs but when i opened the fill plug on the front it was pouring out oil.. Does that mean the oil was sitting on top of water that got in my diff? I did go through some high water about fog lights or so high.
Or did somebody just overfill it and stuck the plug on when it was still pouring out? What are some consequences from water in your differential? And just to clarify... It is 80w90 gear oil in both diffs or 80w90 in the front 75w140 in the rear? 98 4x4 7.5 L/S w/ Trac-Lok



Thanks
Pranger
When in doubt, dump it out. Water is not a good thing especially if it freezes it can bust any part of that axle it wants if it has no place left to expand.

Edit: never mind on the ice part in Santa Cruz
 

Gotta_gofast

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Maybe they filled it with the truck jacked up and not level? If you suspect water, its not going to hurt to drain the old fluid and inspect it now.

I really enjoy amsoil 75w110 as a middle weight for the rear end. 140 weight is a little much for our rangers.
 

Andy D

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My credo
to prevent Found On the Road Dead, Fix Or Repair Daily
You should check every case underneath if you were in foot deep water. Especially if you have an automatic. While you're underneath . locate the vents and make sure they are as high as possible.
 

LIMA BEAN

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You should check every case underneath if you were in foot deep water. Especially if you have an automatic. While you're underneath . locate the vents and make sure they are as high as possible.
1+ ^^^^^^^
 

brinker88

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I cant help but note that you have a L/S which means you need to add the friction additive to the gear oil FYI...
 

PRanger

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I know about friction mod for l/s diffs but I was finding mixed answers on which oil to put in the rear diff 75w140 or 80w90. And a suction gun won't be efficient enough for the water, if any, so I think I'm just gonna have the shop drop the front and clean it out. I will do the rear myself.

Edit: thank you for the responses:beer:
 
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LIMA BEAN

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I know about friction mod for l/s diffs but I was finding mixed answers on which oil to put in the rear diff 75w140 or 80w90. And a suction gun won't be efficient enough for the water, if any, so I think I'm just gonna have the shop drop the front and clean it out. I will do the rear myself.

Edit: thank you for the responses:beer:
Very good choice to dump them. 80/90 is fine in your climate year around. We run 75/140 full synthetic up here alot because we deal with minus -70 below to 100 + F. Just gut them and put in new so you know and as was mentioned scope your vent tubes.
 

brinker88

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Yea, 80/90s perfect for ya
 

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You don't need friction modifier. It gives the truck better street manners by letting the clutches slip a little bit. If you want the L/S to grip better, leave it out.
 

PRanger

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Very good choice to dump them. 80/90 is fine in your climate year around. We run 75/140 full synthetic up here alot because we deal with minus -70 below to 100 + F. Just gut them and put in new so you know and as was mentioned scope your vent tubes.
Okay, thank you. Ya I replaced the breather tubes on my diffs the next day they were pretty brittle and clogged
 

brinker88

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You don't need friction modifier. It gives the truck better street manners by letting the clutches slip a little bit. If you want the L/S to grip better, leave it out.
That's the dumbest thing I've ever heard. You'll burn up your clutches in no time. I should know, it happened to me.
 

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