Rear diff pull ??

Rear diff pull ??

Postby johnny-77 [OP] » August 8th 2008, 8:55am

I'm having a problem with the limited slip diff in my van and would like others opinion before I disassemble it. My limited slip always locked hard making the van walk to the left after the hard right pull. Iv recently had the van trying to pull the rear to the left under light acceleration which is becoming dangerous on corners. What Id like to know is whats involved with over haling one of these. Or if some one elts has had this issue and found a simple fix. Its a 86 with a factory installed rear. I'm more use to working on posi-traction rears so im just guessing the clutches are shot. :feedback:


PS less throttle is not a response!!!! lol
Last edited by johnny-77 on August 26th 2008, 7:03am, edited 4 times in total.
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Re: Rear diff pull ??

Postby gtkane » August 9th 2008, 5:11am

How about less throttle? (Ooops, my bad)

I have never rebuilt these small posi's, I have always sent them out for exchange units.(less headache that way!)
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Re: Rear diff pull ??

Postby Gary » August 9th 2008, 5:19am

gtkane wrote:How about less throttle? (Ooops, my bad)

I have never rebuilt these small posi's, I have always sent them out for exchange units.(less headache that way!)



Gt-I'm trying to nice,but can ya tell me what he said???. :confused: :confused: :eek:
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Re: Rear diff pull ??

Postby johnny-77 [OP] » August 9th 2008, 7:07am

Garry can ya under stand that better? :shrug: Is it the bad spelling or the way im saying thangs? :think:
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Re: Rear diff pull ??

Postby Gary » August 9th 2008, 12:58pm

johnny-77 wrote:Garry can ya under stand that better? :shrug: Is it the bad spelling or the way im saying thangs? :think:



John-I am trying to be kind and respectful.I do think you could spend abit of time proof reading your posts and threads.Surely it is not the case that I am all "that" myself.But for me,it is a on going process as I start threads and reply with posts with how I "try" to express myself and my spelling.I am suggesting it is something you could work on and over time you would be very suprized how much better your going to get.So please do work on that.It will help to better understand you and it will help us out when you need our help as well.
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Re: Rear diff pull ??

Postby johnny-77 [OP] » August 10th 2008, 12:31am

I know spelling is a issue and a lot of the time I cant spell it the way I would say it in person. So please bear with me as I try to improve my spelling as it will become easier to understand me as it does. I will try harder to proof read my work. Catch you later.
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Re: Rear diff pull ??

Postby Matrixx » September 13th 2008, 2:33am

Hi johnny-77
When was the last time you change the diff oil? Their is an additive that must be used that you get from the dealership to add to the diff oil as well. It could just be a simple oil change and clean. I have limited slip and I run Royal Purple 75/90 synthetic with 1 bottle of Diff additive I got from the dealer. I would go the least expensive route first. At least you can have a look inside for any metal parts floating which would indicate a part failure somewhere. Just a thought.

PS: And I understood you just fine johnny-77, some people spend more time criticizing than helping. Take Care. :)
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Re: Rear diff pull ??

Postby andypocock » September 13th 2008, 3:13am

Yes first job is to change the oil as Matrixx says.

If it has been filled in the past without a LSD additive the plates tend to slick locking up at strange times.

I've not taken a GM LSD apart but I've done several on Jaguars. It's no great shakes so long as you can get the parts although sometimes the plates just need a clean. Anybody who has taken a motorcycle clutch apart will feel quite at home.

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Re: Rear diff pull ??

Postby Gary » September 13th 2008, 5:14pm

Matrixx wrote:Hi johnny-77
When was the last time you change the diff oil? Their is an additive that must be used that you get from the dealership to add to the diff oil as well. It could just be a simple oil change and clean. I have limited slip and I run Royal Purple 75/90 synthetic with 1 bottle of Diff additive I got from the dealer. I would go the least expensive route first. At least you can have a look inside for any metal parts floating which would indicate a part failure somewhere. Just a thought.

PS: And I understood you just fine johnny-77, some people spend more time criticizing than helping. Take Care. :)



Matrixx-ahhhhhhhhh,shut up. :eek: :poke: :poke: :whack: :rofl: :rofl: :rofl:

Just kidding bud..... :wave:
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Re: Rear diff pull ??

Postby johnny-77 [OP] » September 15th 2008, 9:08am

The differential oil has been recently changed with a synthetic 75-90 with the additive added. However this actually made the rear act worse not better.
Yes I am aware that this is heaver oil than recommended, but I tried 75-140 and a higher speeds it would engage on corners run perfect at all other times. The only thing that I can think of is that I have doubled the torque and its causing the rear to over heat. I have little time at the moment as college has restarted to test any theories but I welcome any ideas. I have taken the old girl off the road till after I have rebuilt the engine and transition. This because the coarse I am taking requires both be done for the grade. On top of that the local police officer clocked me doing a excessively high speed and instead of a ticket he asked me to park the vehicle for a while. :naughty: :law-police:
I felt that his offer was fairly generous as I was running more than twice the vans governed max speed and I don't care to go to jail. :romance-ballandchain:
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Re: Rear diff pull ??

Postby Matrixx » September 15th 2008, 10:20am

Hi johnny-77
I wasn't aware of you doing work on the rear end recently. 75/90 with additive should be just fine, that's what I have been running for the last couple of years now with no problems. Doubled the torque? Hmmm, that "could" very well be the problem johnny-77, If they are over torqued, then you will have problems, no question about that. They must be torqued to required specs.

Double the governed speed? Did the officer ask you for a pilots license as well? That's [email protected] near take-off speeds (really). Yes I would say he was "More" than fair about that. You might want to get a cool soft drink, grab a chair, and contemplate the meaning of life somewhere johnny-77, going that fast all the time is "really" a numbers game, and that number "will" come up eventually. It will be to late to contemplate anything then johnny-77 and that will be your last and final statement with life as we know it.

Please don't get me wrong here, I'm not nagging, just trying to get you to stop and think about what your doing as you have mentioned. Take Care. :)
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Re: Rear diff pull ??

Postby johnny-77 [OP] » September 20th 2008, 8:20am

I agree that those speeds can equal suicide if take lightly I'm very fond of a particularly desolate stretch of private road that is no longer in use that has no houses or side roads and is fairly strait. I'm am not into endangering others in my per suite for speed. I should mention that when I left for college in the morning I found the two front tires flat due to heat damage pretty stupid to go that fast on normal tires in the front. I know its can be very dangerous. Its is by far the worst addiction that I have. I try to take every precaution possible but as you said it a gamble. I try to keep It off the street and hold back the urge to run at the max. To help my self I'm down grading the engine in the van to a unmodified 305 that Ill "freshen up" for school and put the performance motor in my truck that is so high numerically geared it self limits its speed to about 105mph. As for torque I wasn't talking about the diff but the engine.
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Re: Rear diff pull ??

Postby Matrixx » September 23rd 2008, 1:47pm

Hi johnny-77
Unless it's a race track, no where is really safe. It may be a desolate road but you for got to factor in the wild animals that may be pondering out their. That was one of my worst accidents I had was hitting a dear at 40 MPH. I was crippled up for 6 months because of it. As for speed, yes I have that affliction as well LOL. That's why I know how it can kill very easily. I had 3 Honda CBX 1100 6 cylinder bikes all together, and the last one "really" opened my eyes up to the speed affliction I have (worse on bikes). 150+ MPH and I didn't realize I was going that fast down the Highway until I "glanced" at the speedo, well i just about dropped a 500 pounder on that bomb run (really). Got home sat back in the couch and realized I wasn't going to be here much longer if I kept doing those stupid stunts. Sold the bike to another motor cycle rider and "warned" him (nicely of course) to be careful with this one, it was modified.

He said I know bikes no problem. Well it turns out I ran into his buddy one day after that and I asked the question how was John doing with the bike? He looked at me funny like and said didn't you hear? I said hear what? He said John killed himself on that bike a week after he got it. He hit a pole at 100+ MPH and it was messy. I was stunned when I heard that. And said sorry to hear that, we chatted a bit more about John then I left. So johnny-77 that's why I speak out sometimes when I read comments like yours. This is a family here and well, a mother hen needs to speak. There is so many things that can go wrong in a New York Second with your van at those speeds johnny-77 like burning the sidewalls out. Realistically, taming the motor isn't going to cure your affliction for speed johnny-77, Discipline will. Food for thought. Take good care and god bless johnny-77. :)
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Re: Rear diff pull ??

Postby Gary » September 24th 2008, 3:32am

Being a life long drag racer(on the track only)yrs ago drag racing was formed to keep folks off the street and racing in a "safe place"-the track.What cured me was helping a 17yr old build his 57 chevy only for him to kill himself.Went to see him layed out to have his father tell me how I killed his son.Thru my (I am not kidding now)tears I tried to explain how much Dicky meant to me.Dicky's father wouldn't have any of it.


To this day I have a picture in my mind of Dicky laying there.


If you are not worry about yourself,the people you could hurt on the road,just think about the people you would hurt that you are leaving behind.
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