LSD Slip???
Submitted: Monday, Mar 14, 2005 at 21:12
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Member - Nick (TAS)
Is it possible for a LSD to "SLIP" drive to both rear wheels on bitumen for a split second.Every so often when pulling away from traffic lights in first gear, I seem to be getting partial SLIP from what feels like the rear of the vehicle(no not spinning rear wheels,is only 2.8d after all).Clutch is a H/D LUK, 30000km old but dosnt feel (or smell)to be this.It has only started doing this since changing the rear diff oil going from SRD90 oil to plain 80/90(LSD cactus anyway)Dosnt do it every time and was wondering if its possible for LSD to slip? Cheers All
Reply By: Tim HJ61 - Monday, Mar 14, 2005 at 21:37
Monday, Mar 14, 2005 at 21:37
Hi Nick,
Sounds like you're answering your own question here mate.
I understand LSD's need the correct oil to make them work properly. If you don't use the correct oil, odd things will happen I'd guess. Pretty much like you've described.
My HJ61 had a strong clunk in the rear diff when the oil was hot and it felt like I had broken a spring bolt. The vehicle 'slipped' and jolted as you describe and it sounded pretty dreadful. Solution was to replace the clutches in the LSD.
I suspect that is what is happening in your diff. You've changed the oil so the clutches aren't working properly any more and causing this noise. But you've said the LSD is stuffed anyway, so I am suprised you've not noticed this before. Maybe you have different 'stuffed' symptoms than I did.
The clunking might be coming from the gear backlash, then when you take off the clutches need to slip to take up the slack, but they don't do it properly because of the new oil, and make the clunk.
That's my 2c worth anyway.
Tim
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Follow Up By: Member - Nick (TAS) - Monday, Mar 14, 2005 at 21:48
Monday, Mar 14, 2005 at 21:48
Thanks Tim,Im planning to change the oil back to a LSD oil ASAP but was just wondering if the symptoms were possible or not.From what you explained with yours sounds like it could be it.
Cheers Nick
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Follow Up By: bundyman - Wednesday, Mar 16, 2005 at 11:55
Wednesday, Mar 16, 2005 at 11:55
Nick,
I put normal diff oil in an LSD diff on a Rodeo accidently (stupidly) and it used to bind up the diff (because there is no friction modifier in non LSD oil) and cause the wheels to screech a little when turning from a standing start on the bitumin. I'd change back to LSD oil before looking any further. Good Luck.
Cheers,
Hughesy
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