LSD Slip???

Submitted: Monday, Mar 14, 2005 at 21:12
ThreadID: 21220 Views:2042 Replies:5 FollowUps:6
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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
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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

AnswerID: 102428

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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FollowupID: 360155

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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FollowupID: 360326

Reply By: Member - muzzgit - Tuesday, Mar 15, 2005 at 00:04

Tuesday, Mar 15, 2005 at 00:04
Me thinks your LSD wasn't as cactus as you thought it was.
AnswerID: 102462

Follow Up By: Member - Nick (TAS) - Tuesday, Mar 15, 2005 at 17:57

Tuesday, Mar 15, 2005 at 17:57
Me thinks your right.
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FollowupID: 360244

Reply By: fisho64 - Tuesday, Mar 15, 2005 at 03:37

Tuesday, Mar 15, 2005 at 03:37
No it wont be that, if the LSD was cactus, slipping or whatever, wont stop you diff driving one wheel like a conventional diff so unless one wheel is spinning it wont be the oil. Pinion will be driving the crown wheel, which in turn MUST be driving one wheel or the other. LSD clutches only act between the 2 axles so if its puckeroo still wont slip.
Bet its your clutch. ??
AnswerID: 102468

Follow Up By: Member - Nick (TAS) - Tuesday, Mar 15, 2005 at 18:01

Tuesday, Mar 15, 2005 at 18:01
Gday fisho64,never lost drive,always drove like normal but could feel something"taking up slack like" feeling like it came from rear of vehicle.
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FollowupID: 360245

Follow Up By: fisho64 - Tuesday, Mar 15, 2005 at 23:56

Tuesday, Mar 15, 2005 at 23:56
still sounds like a clutch on its way out. Test it by putting your foot on the brake in 4th gear and slowly let out the clutch. Give it a few revs, it should stall immediately no matter how many revs youv got on.
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FollowupID: 360296

Reply By: rudu - Sunday, Mar 20, 2005 at 20:30

Sunday, Mar 20, 2005 at 20:30
Before doing anything make sure you have the manufacturers recomended oil in your diff, as i had mine changed once by a dealer. drove out and notice all sorts of strange things going on , when i changed the oil back the next day it was ok again.

dont trust an allternative oil.
AnswerID: 103188

Reply By: Member - Nick (TAS) - Sunday, Mar 20, 2005 at 20:41

Sunday, Mar 20, 2005 at 20:41
Changed diff oil this weekend and alls fine.Thank goodness.
AnswerID: 103193

Follow Up By: Tim HJ61 (WA) - Sunday, Mar 20, 2005 at 22:18

Sunday, Mar 20, 2005 at 22:18
Nick,

Glad you've got a positive result with a simple procedure.

But is the LSD working as it should? You're initial posting indicated it was stuffed.
See Post 19048 for hints on how to work out if it's working okay.

Tim
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FollowupID: 360814

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