I did a lauch at around 1500 rpm's and all the power went to the driver side wheel. Then I powerbraked it and the passengerside made only a light mark on the pavement and the driverside was black as hell. Whats going on? It didn't used to do this --could the limited slip be messed up. I have about 65,000 on the clock.

 

if power is only gettin to one wheels somethin's definitely messed up. id pop the cover off your rear and check things out.

 

I would open up the rear end and see if something is broken in the Carrier... If there is something messed up, then I would suggest getting an Auburn Gear Posi... I do know when I romp on my gas for about 3 seconds, 1 wheel spins but then if I keep holding the gas pedal down, then both wheels spin leaving black marks (dark ones from both wheels).. Since you are experiencing only getting power to one wheel, sounds too me that either the Posi (Limited Slip is a form of Posi) worm gear is not engaging properly or maybe a spider gear is binding up... Do you hear any Weird Noises when you are driving w/ either T-Tops off(if you have T-Tops at all), Windows Down or with Convertible Top down(if you have a convert) ?? The only way to find out is either pull the rear end cover and look or take it to the dealer or mechanic...

 

This makes the Auburn better than the ZT unit? Mine gets power to 2 tires both leave rubber from start its the stock Zexel Torson.
He's got to have something broke,just get one of the SLP replacements and throw it in there.

 

Well in my opinion, the Auburn is a better Posi because there is no Wormgear just some springs 2 plates and spider gears... There is nothing wrong with ZT unit, just that Auburn is stronger and seems to handle more abuse... I agree that he's got something broken inside the carrier...

If the ZT was just as strong as the Auburn, then why did SLP use Auburn in some of the SS's ?? I think they use the Auburn Gear in the Firehawk as well but I am not totally sure on that one..

My ZT in my Z28 is working great but after my Factory and Extended warranties are up and my rear end messes up like only acting like an Open Rear end, then I will replace the ZT w/ an Auburn Gear... Even the Carrier on Auburn is stronger compared to previous GM Posi's which was built by either Eaton or Dana....

 

Worm gear ATB style posi is better for road racing, depending how the bias is setup. Basically they never wear out, but its going to be harder on the gear set since there is no clutch slop.

Unfortunately for me the Quaife worm gear setup for my 240 is over $1200! Best for road racing though.

 

could it be maybe his tires arent inflated evenly or he was on uneven pavement? if the pavement is uneven mine will do that.

 

I pretty sure the carrier is going out, i'm going to look into getting an Auburn or and Eaton posi, and while I'm in their upgrade to some 3:73 gears. I don't think it could be my tires I have some good 285 nittos. Anyone know of the part #'s I'll need (suggested parts) to do a gear and carrier swap. I'll order the parts and get a performace shop to put them in. thanks.

 

You may not even have a posi carrier. If its an auto, you very well may have 2.73's with an open carrier. the easiest way to tell if you have 2.73 gears is check for the steel drive shaft. If its steel then you have the 2.73's. Posi was not standard eqiupment on all cars. You had to have certain gear ratios in order to get a posi unit. Also the ZT units do not require posi additive.

 

if it's a z28, it has limited slip standard. a limited slip is not a form of posi, posi or posi-traction to be correct is a form of limited slip. anyway, you likely have a broken gear in the carrier or something else causing the passenger rear to have considerably more turning resistance. time for a detroit locker......

 

My car does have the 2.73's but I"ve done burnouts before and both tires layed down good scratches. What type of new carrier would you suggest?

 

Goood I like hearing this Man that Quaife is a spendy unit As soon as I trash the stock ZT,I'm puttin the ZT T2R in there.

dmnall,I didnt know you dont have the Auburn..I though you did and was describing the way Auburn gets power to the ground and it burns rubber.And the way you descibe your experiences it doesnt seem good and thats why I questioned the fact.
Cuz I get both tires going at a time form start of romping. Good or bad? So either mines different or there might be some sort of prob. with yours.

 

Well #7, I had my car at the dealer because of that, and they opened it up to check the ZT, and no problems... From what i have read about the ZT, is that sometimes there are delays but it could be uneven pavement... Or just the road where I last burned the tires (road by my house)... But most of the time I get a positive lock on when I Floor my car... Plus I am going w/ an Auburn Gear Pro Series for my 68 C10 projects 12 bolt because Open Rear Ends blow

Yeah a Wormgear is probably better because they don't wear out but for $ 1200, the Quaife better perform great for that kind of money... I am not doubting Dr. Mudge, for racing Wormgear is probably better....

Now to answer MARSTAUT, I would recommend getting an Auburn Gear Pro Series Carrier since one they do not have Friction Discs... That is the one downside of an Eaton Posi... There are only 2 plates total (1 for each axle) with springs pressing on the plates to give a better lock... A shop that I deal with (they only build drivelines and differentials) recommended an Auburn when I had to replace the rear carrier on a friends 88 K5 Blazer, and I was impressed with how it performed versus the stock GM (made by Eaton) carrier...

Charlie

 

True, Posi was a brand name. The worm gear stuff has better bias, and since its all gear, there are no clutch packs to wear out or replace or become less effective down the road. I dont have a Torsen option unfortunately for the 240, so for the Fbod consider it a BARGAIN!

 

well that is True that the name Posi was a brand name but when I hear the word posi, I am actually not thinking of the brand name but as short for positraction... Well I hear what you are saying about the worm gear stuff is better because it is all gears and there are not clutch packs to wear out or replace.. Well the Auburn Gear is not using friction discs, but the gears that the axle slides into is a clutch type but how it works is by the preload springs.. These seem to be reliable compare to using Friction discs and a lot less problems in the long run.. Only thing that would ever need to be replaced is the Spring Retainers, Pinion Gears(part of Spider Gears) and Pinion shaft.. Which seems more reliable compared to other posis..
http://www.auburngear.com/aftermarke...differentials/

check out the above.. These positraction aka limited slip differentials are great because they seem to last a long time and perform well... Plus like any differential, both Worm gear and even Auburn can break spider gears or anything.. But it seems that you would not have to worry about either a worm gear posi or even Auburn Gear's posi as much as you would have to with Eaton and Moroso's differentials..

L@tez,

Charlie