my rear end is acting weird the cluches were not working right so i changed the rear end grease lucas to be exact . it didn't not seem to help at all the car goin straight ahead will burn both tires but when i try and pull a cookie only 1 tire will smoke and when i put it into gear there is a clucnk and its not the universals cause i put new ones in it this summer and the reason i posted it on here is because alot of smart people hang out here.

 

I'm just an amateur, but I'll give you my 2 bits anyway.

Did you put posi addative in the oil??

Maybe the clutches are just wearing out.



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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...

R.I.P. #3
"He can see air"

 

No amateurs? Guess that leaves me out...

You could have at least listed the type of dofferential you have, though. The Borgs are different from the Saginaws, which are different from the New Ventures, which are different from the Zexel-Torsens, etc.

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Later,
Vader
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"Click - Click - BOOM!"
Adobe Acrobat Reader

 

my car has 2.77 i don't know what make.But i do have disc brakes and its an 88 iroc so i persume its a 9 bolt

 

lol...you do realize that thirdgen.org has NO paid employees. Everyone here is an amatuer.

 

yep Mrs Jester and Vader are both correct, leaves me out too. damn shame too because i might of been able to help.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

Y'know ede, I woulda said the same thing, but what the heck do I know right?

Anyhoo, I'm in a nice mood tonight so I'll poke for fun. No Vader, I already know your reply to that!
By cookies you mean donuts right? It's been a while but depending on what you have and what power you have you may not spin 'em both in a donut.
I will say that GM rears are extremely picky with their additives and weights. As For the clunk, I can almost guarantee what it is, but I'm no expert... in mechanics anyway.


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"Question with boldness even the existence of a *** ; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."

-Thomas Jefferson

 

Just another non-professional chiming in...what you need to do is...never mind.

Wait'll a pro tells ya.

Besides, that 2.77 doesn't have any clutches in it.

Hmmn, maybe there should be a rule.

"No Amateurs allowed to post if you are not sure how the ***** your car is assembled"

 

Dang, I can't even spell "intercourse" with a "ph" instead of an "f".

 

hey 8mike9,
maybe fuc will work, well i guess we'll see.
anyway, just asking, not being one of those wise asses. But if he had a limited slip 2.77, wouldn't that have clutches?
just curious.
i'm always looking for an education.
I'm gonna go do some cookies, and bake some doughnuts!
Later all.

 

LOL, I'm not even expert enough to know whether to put "grease" or a high quality synthetic gear oil in my rear !

Seriously, did you put in the limited-slip additive?

------------------
1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

It uses a cone type assembley, one kinda rides in another and has a spring force on it. Not like the metal plates of old. I dunno, maybe it's called 'clutches', who knows.

To the original poster, a couple of things...

Additive is used to allow the cones or plates to slip within/against themselves without chattering.

The posi unit, IMO, has nothing to do with clucking when you put it in gear.

ONe wheel spinning is a sign the posi si not holding...but could be due to having an extreme force in place that inhibits the wheel from spinning.

Do this...

Pull a wheel off.

Fab a plate with a few holes that can be mounted on the axle.

As close to center as you can on the plate, either weld a nut, or drill a 1/2inch hole, and then file it to 1/2inch square hole.

With that side in the air, the other on the ground, and the car in neutral and the plate bolted to the axle housing, put your torque wrench 9probably need a 6-8inch extension) in the hole or on the nut you welded, and rotate the axle.

See how much torque it take to rotate it...I don't have my manual close by, but I think the spec should be no less than aboiut 40ft/lbs. A new posi/LS unit should hold 65-70ft/lbs.

This will give you an indication of how much your unit is worn.

As for the clunking, rotate the driveshaft (tranny in neutral) and see how much slop you have rotaining the pinion/shaft, against the ring gear. BW spec is probably .004-.008 or somewhere in there (most stock rears are about that) and see if that's where the clunking is coming from.

Also check the tranny mount while you're under it.

Did you replace both universals? Normally when they go they make a "clink" when you slip it into gear.

 

Anybody who pulls "cookies" with "graese" in their rear-end is the true AMETURE.

If you are to embarassed to admit you forgot posi aditive, dont think of it as something that allows your clutches (which is exactly what your car has cones or not) to slip more, think of it as something that allows them to operate correctly and without excessive wear. It sounds to me like an auburn, or auburn pro series posi. In which case the only posi additive that will work for you is GM's, It is a miracle sollution that works like magic. but disregard all that, because Im an ameture too

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[This message has been edited by tpi_roc (edited September 09, 2001).]