differential fluid change - Page 2 - JeepForum.com
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post #16 of 24 Old 07-27-2011, 03:19 PM
Brainwashed2566
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Did you use Royal Purple gear oil? I have heard a lot of bad from them for using purple dyes and such. If you did use it how do you like it?


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post #17 of 24 Old 07-27-2011, 04:29 PM
freeskier93
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Originally Posted by LWB1217 View Post
ok guys so thanks for the help, i was able to finish it.
i ended up putting rp 75-140 in it because in my manual it says with severe service you should. i dont want to start any synthetic vs. dino war here. im just wondering if i chose the right weight in hindsight. when they say severe service does that like if ever taken offroad or driven in harsh conditions? and what could the bad effects be of the heavier weight oil?
The side effects of heavier gear oil would be worse gas milage. But I doubt you can calculate your milage good enough to even notice a difference with heavier oil. For a Jeep I would def. stick with the heavier stuff.
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post #18 of 24 Old 07-27-2011, 04:49 PM
sethhawk1
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Quote:
Originally Posted by freeskier93
I doubt you will need any additive. Just about every gear oil already comes with LSD additives in it. I don't know how Versachem compares to Permatex, but Permatex black is what should be used for diff covers as it won't break down due to the gear oil.
When I installed my lsd I didn't use the additive and it was fine for about thirty thousand miles and then around corners it would make a horrible loud bang and pop. Added the additive and never had a problem since. Wish I could remember the gear oil I used...
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post #19 of 24 Old 07-27-2011, 05:53 PM
2jhanna
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Originally Posted by sethhawk1 View Post
When I installed my lsd I didn't use the additive and it was fine for about thirty thousand miles and then around corners it would make a horrible loud bang and pop. Added the additive and never had a problem since. Wish I could remember the gear oil I used...
I would think that at 30k miles you would have been due to change again, hence, no need to add additive.

To the OP, I have found that most gear oils have 1 of the statements on the rear label.

1. Something like, "approved for fill of conventional and top-off or make-up of limited slip diffs".

2. Something like, "approved for fill of conventional and limited slip diffs".

The gear oil with a statement similar to 2 should have the additive built in in the correct amount.

Also, I get a gallon jug and have some left over.

Example:

In addition, PENNZOIL® GEARPLUS® SAE 80W-90 GL-5 is fully formulated for all limited slip differentials. It may be
used as a makeup or refill fluid, even for rebuilt limited slip units and is designed for all high performance hypoid axles of
cars, pick up trucks, sports utility vehicles as well as sports, police and racing cars. It is also recommended for
conventional differentials.

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post #20 of 24 Old 07-27-2011, 05:59 PM
sethhawk1
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I think I would just be safe an add a bottle anyway. I think the bottle is only like give bucks and as far as I know it won't hurt anything anyway.
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post #21 of 24 Old 07-27-2011, 06:04 PM
freeskier93
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Originally Posted by sethhawk1 View Post
I think I would just be safe an add a bottle anyway. I think the bottle is only like give bucks and as far as I know it won't hurt anything anyway.
You don't want to add to much additive. If you add to much the LSD becomes useless because it allows the clutches to slip to much. If you buy gear oil make sure it says it has LSD additive in it. If for some reason you still hear chattering coming from the back end then slowly add the additive until the chattering goes away.
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post #22 of 24 Old 07-27-2011, 06:47 PM Thread Starter
LWB1217
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Quote:
Originally Posted by Brainwashed2566 View Post
Did you use Royal Purple gear oil? I have heard a lot of bad from them for using purple dyes and such. If you did use it how do you like it?
yeah i used rp. im liking pretty well so far but ive only driven 2.7 miles with the new oil in so.....it could go either way from here.
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post #23 of 24 Old 07-27-2011, 07:33 PM
Jerry Bransford
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Quote:
Originally Posted by sethhawk1 View Post
I think I would just be safe an add a bottle anyway. I think the bottle is only like give bucks and as far as I know it won't hurt anything anyway.
Too much additive is nearly as bad as no additive where that particular additive (friction modifier) is concerned. I would only add more additive if I knew specifically that the gear lube did not contain any additive. By far, the majority of gear lubes do already contain the additive.

When you have a choice, buy American made.
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post #24 of 24 Old 07-28-2011, 10:46 AM
sethhawk1
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Well op I would listen to these guys cause they know more than i
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