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Old 11-01-2011, 11:13 AM   #1
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Trac-Lock Rear End - What Lube/Additive?

Hi Everyone,

I want to change my differential fluids on my 97 TJ. I know I have the Dana 44, but didnt know if I had the Track-Lock / Limited Slip rear-end (I did not jack it up to rotate the tires to check).

I called Milford Jeep today (Service Dept), and had them run my VIN to determine if I had the Trac-Lock. They confirmed my model did in fact have this.

So, here are my (stupid) questions:

1) I suppose I need to purchase and add the 'friction modifier' to the gear oil I buy for the rear, correct?

2) What gear oil (weight) and friction modifier should I get?

3) And for the really stupid question, does the front differential require the friction modifier too, or just the rear?

Thanks Everyone!

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Old 11-01-2011, 11:18 AM   #2
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Yes the rear requires friction modifier. Most synthetics have modifier already in it as do some regular oils. If the bottle states "for limited slip differentials", it has it in it. If not, any auto parts store has bottles of modifer. It usually comes in 4oz bottles and that's all you need. The front does not have a limited slip. If the oil has it in it, that's fine to use in front also. If not, no need to add for the front.

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Old 11-01-2011, 05:06 PM   #3
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Mopar limited slip additive friction modifier 4318060AB trac lock... $8 on eBay
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Old 11-01-2011, 05:09 PM   #4
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off topic But do you mean Milford CT? Thats where I was born and went to school.
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Old 11-01-2011, 05:11 PM   #5
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off topic But do you mean Milford CT? Thats where I was born and went to school.
Yup!
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Old 11-01-2011, 05:13 PM   #6
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haha, thats cool. I went to east shore middle school way back in 91-93
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Old 11-01-2011, 08:10 PM   #7
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99% of suitable GL-5 gear lubes already contain sufficient friction modifier which is required by a clutch-based limited slip differential like the Tracloc. Don't add more friction modifier additive if the gear lube you add already contains it. The friction modifier additive is compatible with all axles whether they have a clutch-based limited slip or not.

You can rest assured if the back label of the gear lubricant bottle you're looking at has the friction modifier if it includes words to the effect of 'Compatible with Limited Slip Differentials".
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Old 11-01-2011, 08:15 PM   #8
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/\ /\ Thanks Mr. Bransford, and Everyone else!
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Old 11-02-2011, 02:01 PM   #9
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Quote:
Originally Posted by Jerry Bransford View Post
99% of suitable GL-5 gear lubes already contain sufficient friction modifier which is required by a clutch-based limited slip differential like the Tracloc. Don't add more friction modifier additive if the gear lube you add already contains it. The friction modifier additive is compatible with all axles whether they have a clutch-based limited slip or not.

You can rest assured if the back label of the gear lubricant bottle you're looking at has the friction modifier if it includes words to the effect of 'Compatible with Limited Slip Differentials".
Jerry, on your statement about "resting assure if the back label stating compatible with....", here is what Amsoil's gear lube states:

AMSOIL 80W-90 SYNTHETIC GEAR LUBE is compatible with most limited slip differentials. If limited slip differential chatter occurs, add AMSOIL Slip-Lock™ friction modifier additive.

Coming from Amsoil, that is pretty 'vague' (having to wait to see if one hears chatter)...
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Old 04-15-2012, 04:37 PM   #10
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I have a 05 LJ with the Dana 44 True Trac and was thinking about going to AMSOIL and the website recommended 75w-140 Severe Gear. I currently have 75w-90 in it fluid continues to come out of the vent tube. I am wondering if I should use the 75-140 or if a 75-110 with lsd additive would suffice. I go off roading often and live in Hillsboro Oregon so high temps is not a common. Anyhelp would be much appreciated.
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Old 04-15-2012, 04:46 PM   #11
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If in doubt, add the friction modifier. If you need it, then you're good to go. If you don't need it, you're out a few bucks. No harm, no foul...
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Old 04-15-2012, 06:05 PM   #12
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so do you think 75w140 is not neccesary then? AMSOIL makes a 75w110 and i was thinking it would be a happy medium between the 75w140 and 75w90
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Old 04-15-2012, 06:11 PM   #13
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75W110 should be ok, I opted for the 75W90 in mine, but I don't do hard wheeling, towing or anything of the like.
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Old 04-15-2012, 06:19 PM   #14
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thanks. There just is so many different opinions and answers out there and i am unfamiliar with this Tracloc system and the Dana 44. The amsoil site and other mechanics recommend 75w140
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Old 04-15-2012, 06:50 PM   #15
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Quote:
Originally Posted by lindel View Post
If in doubt, add the friction modifier. If you need it, then you're good to go. If you don't need it, you're out a few bucks. No harm, no foul...
Too much friction modifier can cause the clutch pack in the Tracloc to misbehave. Add more only if needed.

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