Posted: Thu Feb 07, 2013 9:53 am Post subject: Powr-Lok limited slip diffs - knowledge base
Hi fellows,
I started this thread to share my experience on this and it should be the basket for all further posts on the Powr-Loks...
I have those on both axles since years and was not 100% satisfied with the lock-up (the clutch packs are nearly new). I tested a row of diff oils and additives so far:
- plain 80W90 + Mopar limited slip (=l/s) additive
- plain 80W90 + Jaguar l/s additive (the Jag XJR had also Powr-Lok in the rear)
- ready mixed 80W90 l/s
Last summer during further research I came accross the Red Line products.
I called them and the talk with one of their tech. developers was quite interesting: technically identical l/s with friction plates are used in many race cars - so there is a demand from that side also. Red Line therefore offers a diff oil that is without any additives (marked "NS" - no slippage) that leads to slippage (most normal diff oils already contain substances that lead to slippage of the friction plates).
After completely emptying the diff (I kept mine open for 2 weeks - still dropping...), they fill in the NS diff oil, to have a plain "zero" start with adjusting. Then Red Line friction modifier ist added (starting with 3% of the fillage of NS) as a bottom line. Then start testing making turns on smooth ground, eg. grass and see how the lock-up is (noticable on the grass destruction, wife should be in local shopping mall during this, spend ice for the children). Then repeat this on paved road - carefully, later also on wet, slippery, snowed, icy roads - you donīt want to go straight on corners...
The more additive is filled in, the more slip you get - it is biasing between off-road capability an on-road maneuverability...
In my case these two products really made a difference "before/after" - for me the proof itīs worth the money and not only product marketing...
So far from my side, hope this answers questions of others also.
Philipp
Last edited by pduske on Thu Feb 07, 2013 10:13 am; edited 1 time in total
2- I don't see a test with the correct limited slip gear oil specified in the jeep manual and still available at Chrysler dealers. Were you not able to obtain this ready to fill gear oil from Chrysler in Europe. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
What were your test results for that one season with the specified Jeep/Chrysler LS lubricant?
Can you elaborate on the results of your tests with the three Gear oil + additive as well? _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
the experiences were with all diff oil combinations applied before, that off-road the Powr-Loks did not lock up as I expected. Now it comes near to results as Dr. Vern described his Powr-Lok.
So none of these outperformed the other? All four performed exactly the same?
Quote:
- plain 80W90 + Mopar limited slip (=l/s) additive
- plain 80W90 + Jaguar l/s additive (the Jag XJR had also Powr-Lok in the rear)
- ready mixed 80W90 l/s
the original Chrysler LS lubricant.
certainly there must be some differences but they where not really noticeable for me. I remember the combination The combination "plain 80W90 + Mopar limited slip" - gave the best of the still non-satisfying results.
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