Cheap gear oil or H2O give rough feel?

Joined
Nov 30, 2004
Messages
423
Location
Moncton, NB
 
I'm trying to narrow down the rough feel from my front end.

Recently I changed my fr / rr diff fluid with cheap gear oil. I wanted to clear the slight sludge possibly caused by grease getting sucked into the diff fluid. Once I free my diff breathers, I plan on changing the fluid to synthetic, but at $12/L I'm holding off for now.

Soon after the diff fluid change I felt that the truck rolls rougher. It is not driveline related because I feel it increase with speed and when the truck is in nuetral. It is even noticeable when the transfer case is in nuetral.

I may also have water in there because shortly after the change I did some deep water crossings.

So basically do you think it's the cheap gear oil or water?
 

CharlieS

SILVER Star
Joined
Feb 4, 2005
Messages
1,730
 
 
 
I think cheap gear oil is fine. If you got water in there then it may not be lubricating all that well.

Personally, I'm running some Coastal 80W-90 gear oil in my front diff to get a "flush" after doing my birf job (just in case). I plan to put some name brand dino oil in in a week or so.

Charlie
 

Cruiserdrew

On the way there
SILVER Star
Joined
Mar 15, 2003
Messages
15,824
Location
Sacramento, CA
 
 
 
I've run lots of cheap gear oil and never had a rough feel to it. In fact, the specs on the cheap stuff are the same as the specs on the good stuff. While I try to keep good stuff in the diffs, I don't sweat a few thousand miles on the cheap stuff depending on the circumstances. My FJ40 always runs on the cheap stuff, and I change it 2-3 times per summer when I've been in water. It works just fine.

For a rough feel, look at wheel bearings, u-joints, transfercase out put and the like.
 
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