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  #13  
Old 04-20-2010, 03:55 PM
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Re: LSD Additives...Where to find?

ok, thanks for the heads up on the Trans X...dammit now.

I was doing a little research and AMC Quadra Trac is totally different than Chrysler QT; has a limited slip in the transfer case, I believe...all this Quadra this and Quadra that is driving me QuadraNUTS!
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  #14  
Old 04-20-2010, 06:21 PM
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Re: LSD Additives...Where to find?

Just honestly go to advance auto etc and buy Mobil 1 75w140 SYNTHETIC and call it a day. It's fully synthetic and has the limited slip additive already in it. Run it and see how it goes. Should be good.
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  #15  
Old 04-20-2010, 06:27 PM
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Re: LSD Additives...Where to find?

Tempting, but I don't want to rebuild my differentials.....I might as well go to the dealer and buy their $30 PER QUART FLUID!
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  #16  
Old 04-20-2010, 06:29 PM
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Re: LSD Additives...Where to find?

There's this weird guy on my corner that tweaks a lot, I hear he has some "LSD additive," he says it'll make you see shit you've never seen before.
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Old 04-20-2010, 06:37 PM
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Re: LSD Additives...Where to find?

I buy the additive from the dealer. They decanter just enough to do my two diffs and charge me accordingly.
I read the specs on it some time ago on the Mopar bottle and I couldn't exactly match the spec, so decided it wasn't worth the risk and used the genuine stuff.
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Old 04-20-2010, 06:56 PM
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Re: LSD Additives...Where to find?

I use BG's LSII in all my Jeep diffs that need an additive. Mobile 1 synthetic in those that call for synthetic and Castrol diff fluid in those that do not. Has always worked well for me and the BG stuff was recommended to me by my Jeep parts guy.

http://www.bgprod.com/products/driveline.html
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  #19  
Old 04-20-2010, 07:17 PM
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Re: LSD Additives...Where to find?

Joe which Gear Oil do you use then? 75W140? Also do you use BG's Gear Lubricant?
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Old 04-20-2010, 07:27 PM
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Re: LSD Additives...Where to find?

What is BG? I'm in Australia.
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Old 04-20-2010, 08:12 PM
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Re: LSD Additives...Where to find?

Quote:
Originally Posted by Chaoul1 View Post
Tempting, but I don't want to rebuild my differentials.....I might as well go to the dealer and buy their $30 PER QUART FLUID!
That is just for the fluid though (ps - that mopar parts america link above is $19.98). You still need the additive...Anybody have the p/n for the Mopar additive? OK, this is what is frustrating...I can only seem to find "Limited Slip Additive", but it is not specific. Yet, the LSD additive says you can't use on QD II system? (per the posting above reading the label. weird they don't show that on their site though).

One thing about german(influenced here) goods...documentation is poor, lol! You should see my prazi lathe, argh!
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Old 04-20-2010, 09:23 PM
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Re: LSD Additives...Where to find?

BG is a brand of automotive fluids, much like STP, Mobil, or any other. Their injector & throttle body cleaners are some of the best around IMHO. I use whatever gear oil weight that is called for in the owner/service manual and yes the friction modifier is in addition to the gear lube. Some axles need it, others don't, it should be in your owner's manual.

There are at least two different axle/diffs used in the WKs and there are even more if you toss in all the other Jeep models. It is not as simple as just asking others what they use in their WK, you need to know what diffs are under your Jeep and what fluid belongs in them. The QDII in my 07 WK has electronic limited slip diffs (ELSD). It doesn't function like an open diff or a more traditional limited slip diff or a diff with a locker added. It also doesn't necessarily use the same fluid or additives. The ELSD do not require the addition of a friction modifier, just 75W-140 synthetic gear lubricant. If i had a different system in that Jeep, one with vari-lock axles, I'd be adding 6oz of an appropriate friction modifier to each diff before adding the correct gear lube.

Know what you have, read the owners manual and use what is recommended.
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  #23  
Old 04-20-2010, 10:49 PM
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Re: LSD Additives...Where to find?

Quote:
Originally Posted by Joe in PA View Post
BG is a brand of automotive fluids, much like STP, Mobil, or any other. Their injector & throttle body cleaners are some of the best around IMHO. I use whatever gear oil weight that is called for in the owner/service manual and yes the friction modifier is in addition to the gear lube. Some axles need it, others don't, it should be in your owner's manual.

There are at least two different axle/diffs used in the WKs and there are even more if you toss in all the other Jeep models. It is not as simple as just asking others what they use in their WK, you need to know what diffs are under your Jeep and what fluid belongs in them. The QDII in my 07 WK has electronic limited slip diffs (ELSD). It doesn't function like an open diff or a more traditional limited slip diff or a diff with a locker added. It also doesn't necessarily use the same fluid or additives. The ELSD do not require the addition of a friction modifier, just 75W-140 synthetic gear lubricant. If i had a different system in that Jeep, one with vari-lock axles, I'd be adding 6oz of an appropriate friction modifier to each diff before adding the correct gear lube.

Know what you have, read the owners manual and use what is recommended.
Well, below is what is shown in the owner's manual and wkjeeps.com website and most other places I've read (Perhaps you've been lucky in not adding the appropriate LSD additive? )...It's not a matter of if I need additive, but whether it is special or not (for instance, my torsen limited slip unit in my GTO required a special GM spec, whereas a 12-bolt 'posi-traction' does not necessarily (as in the equa torque or trans x would work fine), etc.). I know many of the oil manufacturer's synthetic claim to contain additive and they probably have some in there, but in many different vehicles I've used it in, they always needed the additional modifier to keep the chattering and such at bay...





200mm (front)

200mm (front, ELSD*)


213mm (rear)

213mm (rear, ELSD*)

226mm (rear, SRT8)

C200F
57.5 oz ( 2 oz.)

C200FE
57.5 oz ( 2 oz.)





C213R
70.0 oz. ( 2 oz.)
C213RE
75.5 oz. ( 2 oz.) 226RBI (Dana 44)
76.0 oz. ( 2 oz.)
All models, all axles:
Mopar SAE 75W-140 Synthetic (API-GL5)
Mopar p/n 04874469 (MSRP $30.00 per quart)
Mopar p/n 68003055AB (bulk, 16 gallon barrel)
*NOTE: Electronic (ELSD) axles require 118 ml (4 ounces) of Limited Slip Additive be added to the lubricant. ELSD axles are standard with Quadra-Drive II.
SRT8 models DO NOT require Limited Slip Additive.
Front and rear axle drain plug torque: 44 ft. lbs/60 Nm
Front axle cover bolts: 41 ft. lbs/56 Nm
Rear axle cover bolts: 30 ft. lbs/41 Nm
See images at far left for additional axle information. SRT8 axle and t-case fluid change directions
30,000 mi.15,000 mi.
Attached Images
File Type: jpg Jeep-owners Fluid.jpg (44.0 KB, 63 views)
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  #24  
Old 04-20-2010, 11:32 PM
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Re: LSD Additives...Where to find?

And here is what is in the service manual for my 07' WK, the one with nearly 275 pages devoted to just the axles and drive shafts, says:

FRONT AXLE
• 200MM - MoparT Synthetic Gear Lubricant 75W-140

REAR AXLE
• 213MM - MoparT Synthetic Gear Lubricant 75W-140

NOTE: Vari-lok equipped axles require 118 ml (4 ounces) of Limited Slip Additive be added to the lubricant.

Now maybe I am mistaken and the vari-lock axles are the same as the ELSD? But I have never added any additives to the mobile1 gear lube in my QDII equipped WK and so far it still works as it should. Now if your manual says to add it and you believe it has to be mopar only, by all means add it when you change the lube.
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